MIPS: BCM47xx: sprom: read values without prefix as fallback

There are bcma based devices like the Linksys E2000 out there, which do
have one ieee80211 core, but no PCIe core and they are using no
prefixes for the sprom. In addition some values like boardtype are
stored without a prefix for the main SoC chip also when they have an
additional PCIe wifi chip with an own boardtype var on some devices.

The Ethernet addresses are now also read out correctly without a prefix
so calling bcm47xx_fill_sprom_ethernet is not needed any more.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Patchwork: http://patchwork.linux-mips.org/patch/4364
Signed-off-by: John Crispin <blogic@openwrt.org>

3 files changed, 449 insertions, 332 deletions

diff --git a/arch/mips/bcm47xx/setup.c b/arch/mips/bcm47xx/setup.c
index 803764df9b14..4d54b58dbd32 100644
--- a/arch/mips/bcm47xx/setup.c
+++ b/arch/mips/bcm47xx/setup.c
@@ -94,7 +94,7 @@ static int bcm47xx_get_sprom_ssb(struct ssb_bus *bus, struct ssb_sprom *out)
 		snprintf(prefix, sizeof(prefix), "pci/%u/%u/",
 			 bus->host_pci->bus->number + 1,
 			 PCI_SLOT(bus->host_pci->devfn));
-		bcm47xx_fill_sprom(out, prefix);
+		bcm47xx_fill_sprom(out, prefix, false);
 		return 0;
 	} else {
 		printk(KERN_WARNING "bcm47xx: unable to fill SPROM for given bustype.\n");
@@ -113,7 +113,7 @@ static int bcm47xx_get_invariants(struct ssb_bus *bus,
 	bcm47xx_fill_ssb_boardinfo(&iv->boardinfo, NULL);
 
 	memset(&iv->sprom, 0, sizeof(struct ssb_sprom));
-	bcm47xx_fill_sprom(&iv->sprom, NULL);
+	bcm47xx_fill_sprom(&iv->sprom, NULL, false);
 
 	if (nvram_getenv("cardbus", buf, sizeof(buf)) >= 0)
 		iv->has_cardbus_slot = !!simple_strtoul(buf, NULL, 10);
@@ -165,18 +165,17 @@ static int bcm47xx_get_sprom_bcma(struct bcma_bus *bus, struct ssb_sprom *out)
 		snprintf(prefix, sizeof(prefix), "pci/%u/%u/",
 			 bus->host_pci->bus->number + 1,
 			 PCI_SLOT(bus->host_pci->devfn));
-		bcm47xx_fill_sprom(out, prefix);
+		bcm47xx_fill_sprom(out, prefix, false);
 		return 0;
 	case BCMA_HOSTTYPE_SOC:
 		memset(out, 0, sizeof(struct ssb_sprom));
-		bcm47xx_fill_sprom_ethernet(out, NULL);
 		core = bcma_find_core(bus, BCMA_CORE_80211);
 		if (core) {
 			snprintf(prefix, sizeof(prefix), "sb/%u/",
 				 core->core_index);
-			bcm47xx_fill_sprom(out, prefix);
+			bcm47xx_fill_sprom(out, prefix, true);
 		} else {
-			bcm47xx_fill_sprom(out, NULL);
+			bcm47xx_fill_sprom(out, NULL, false);
 		}
 		return 0;
 	default:
diff --git a/arch/mips/bcm47xx/sprom.c b/arch/mips/bcm47xx/sprom.c
index 7fa3da3fda48..289cc0a38638 100644
--- a/arch/mips/bcm47xx/sprom.c
+++ b/arch/mips/bcm47xx/sprom.c
@@ -42,25 +42,39 @@ static void create_key(const char *prefix, const char *postfix,
 		snprintf(buf, len, "%s", name);
 }
 
+static int get_nvram_var(const char *prefix, const char *postfix,
+			 const char *name, char *buf, int len, bool fallback)
+{
+	char key[40];
+	int err;
+
+	create_key(prefix, postfix, name, key, sizeof(key));
+
+	err = nvram_getenv(key, buf, len);
+	if (fallback && err == NVRAM_ERR_ENVNOTFOUND && prefix) {
+		create_key(NULL, postfix, name, key, sizeof(key));
+		err = nvram_getenv(key, buf, len);
+	}
+	return err;
+}
+
 #define NVRAM_READ_VAL(type)						\
 static void nvram_read_ ## type (const char *prefix,			\
 				 const char *postfix, const char *name,	\
-				 type *val, type allset)		\
+				 type *val, type allset, bool fallback)	\
 {									\
 	char buf[100];							\
-	char key[40];							\
 	int err;							\
 	type var;							\
 									\
-	create_key(prefix, postfix, name, key, sizeof(key));		\
-									\
-	err = nvram_getenv(key, buf, sizeof(buf));			\
+	err = get_nvram_var(prefix, postfix, name, buf, sizeof(buf),	\
+			    fallback);					\
 	if (err < 0)							\
 		return;							\
 	err = kstrto ## type (buf, 0, &var);				\
 	if (err) {							\
-		pr_warn("can not parse nvram name %s with value %s"	\
-			" got %i", key, buf, err);			\
+		pr_warn("can not parse nvram name %s%s%s with value %s got %i\n",	\
+			prefix, name, postfix, buf, err);		\
 		return;							\
 	}								\
 	if (allset && var == allset)					\
@@ -76,22 +90,19 @@ NVRAM_READ_VAL(u32)
 #undef NVRAM_READ_VAL
 
 static void nvram_read_u32_2(const char *prefix, const char *name,
-			     u16 *val_lo, u16 *val_hi)
+			     u16 *val_lo, u16 *val_hi, bool fallback)
 {
 	char buf[100];
-	char key[40];
 	int err;
 	u32 val;
 
-	create_key(prefix, NULL, name, key, sizeof(key));
-
-	err = nvram_getenv(key, buf, sizeof(buf));
+	err = get_nvram_var(prefix, NULL, name, buf, sizeof(buf), fallback);
 	if (err < 0)
 		return;
 	err = kstrtou32(buf, 0, &val);
 	if (err) {
-		pr_warn("can not parse nvram name %s with value %s got %i",
-			key, buf, err);
+		pr_warn("can not parse nvram name %s%s with value %s got %i\n",
+			prefix, name, buf, err);
 		return;
 	}
 	*val_lo = (val & 0x0000FFFFU);
@@ -99,22 +110,20 @@ static void nvram_read_u32_2(const char *prefix, const char *name,
 }
 
 static void nvram_read_leddc(const char *prefix, const char *name,
-			     u8 *leddc_on_time, u8 *leddc_off_time)
+			     u8 *leddc_on_time, u8 *leddc_off_time,
+			     bool fallback)
 {
 	char buf[100];
-	char key[40];
 	int err;
 	u32 val;
 
-	create_key(prefix, NULL, name, key, sizeof(key));
-
-	err = nvram_getenv(key, buf, sizeof(buf));
+	err = get_nvram_var(prefix, NULL, name, buf, sizeof(buf), fallback);
 	if (err < 0)
 		return;
 	err = kstrtou32(buf, 0, &val);
 	if (err) {
-		pr_warn("can not parse nvram name %s with value %s got %i",
-			key, buf, err);
+		pr_warn("can not parse nvram name %s%s with value %s got %i\n",
+			prefix, name, buf, err);
 		return;
 	}
 
@@ -126,336 +135,435 @@ static void nvram_read_leddc(const char *prefix, const char *name,
 }
 
 static void nvram_read_macaddr(const char *prefix, const char *name,
-			       u8 (*val)[6])
+			       u8 (*val)[6], bool fallback)
 {
 	char buf[100];
-	char key[40];
 	int err;
 
-	create_key(prefix, NULL, name, key, sizeof(key));
-
-	err = nvram_getenv(key, buf, sizeof(buf));
+	err = get_nvram_var(prefix, NULL, name, buf, sizeof(buf), fallback);
 	if (err < 0)
 		return;
+
 	nvram_parse_macaddr(buf, *val);
 }
 
 static void nvram_read_alpha2(const char *prefix, const char *name,
-			     char (*val)[2])
+			     char (*val)[2], bool fallback)
 {
 	char buf[10];
-	char key[40];
 	int err;
 
-	create_key(prefix, NULL, name, key, sizeof(key));
-
-	err = nvram_getenv(key, buf, sizeof(buf));
+	err = get_nvram_var(prefix, NULL, name, buf, sizeof(buf), fallback);
 	if (err < 0)
 		return;
 	if (buf[0] == '0')
 		return;
 	if (strlen(buf) > 2) {
-		pr_warn("alpha2 is too long %s", buf);
+		pr_warn("alpha2 is too long %s\n", buf);
 		return;
 	}
 	memcpy(val, buf, sizeof(val));
 }
 
 static void bcm47xx_fill_sprom_r1234589(struct ssb_sprom *sprom,
-					const char *prefix)
+					const char *prefix, bool fallback)
 {
-	nvram_read_u8(prefix, NULL, "ledbh0", &sprom->gpio0, 0xff);
-	nvram_read_u8(prefix, NULL, "ledbh1", &sprom->gpio1, 0xff);
-	nvram_read_u8(prefix, NULL, "ledbh2", &sprom->gpio2, 0xff);
-	nvram_read_u8(prefix, NULL, "ledbh3", &sprom->gpio3, 0xff);
-	nvram_read_u8(prefix, NULL, "aa2g", &sprom->ant_available_bg, 0);
-	nvram_read_u8(prefix, NULL, "aa5g", &sprom->ant_available_a, 0);
-	nvram_read_s8(prefix, NULL, "ag0", &sprom->antenna_gain.a0, 0);
-	nvram_read_s8(prefix, NULL, "ag1", &sprom->antenna_gain.a1, 0);
-	nvram_read_alpha2(prefix, "ccode", &sprom->alpha2);
+	nvram_read_u8(prefix, NULL, "ledbh0", &sprom->gpio0, 0xff, fallback);
+	nvram_read_u8(prefix, NULL, "ledbh1", &sprom->gpio1, 0xff, fallback);
+	nvram_read_u8(prefix, NULL, "ledbh2", &sprom->gpio2, 0xff, fallback);
+	nvram_read_u8(prefix, NULL, "ledbh3", &sprom->gpio3, 0xff, fallback);
+	nvram_read_u8(prefix, NULL, "aa2g", &sprom->ant_available_bg, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "aa5g", &sprom->ant_available_a, 0,
+		      fallback);
+	nvram_read_s8(prefix, NULL, "ag0", &sprom->antenna_gain.a0, 0,
+		      fallback);
+	nvram_read_s8(prefix, NULL, "ag1", &sprom->antenna_gain.a1, 0,
+		      fallback);
+	nvram_read_alpha2(prefix, "ccode", &sprom->alpha2, fallback);
 }
 
 static void bcm47xx_fill_sprom_r12389(struct ssb_sprom *sprom,
-				      const char *prefix)
+				      const char *prefix, bool fallback)
 {
-	nvram_read_u16(prefix, NULL, "pa0b0", &sprom->pa0b0, 0);
-	nvram_read_u16(prefix, NULL, "pa0b1", &sprom->pa0b1, 0);
-	nvram_read_u16(prefix, NULL, "pa0b2", &sprom->pa0b2, 0);
-	nvram_read_u8(prefix, NULL, "pa0itssit", &sprom->itssi_bg, 0);
-	nvram_read_u8(prefix, NULL, "pa0maxpwr", &sprom->maxpwr_bg, 0);
-	nvram_read_u16(prefix, NULL, "pa1b0", &sprom->pa1b0, 0);
-	nvram_read_u16(prefix, NULL, "pa1b1", &sprom->pa1b1, 0);
-	nvram_read_u16(prefix, NULL, "pa1b2", &sprom->pa1b2, 0);
-	nvram_read_u8(prefix, NULL, "pa1itssit", &sprom->itssi_a, 0);
-	nvram_read_u8(prefix, NULL, "pa1maxpwr", &sprom->maxpwr_a, 0);
+	nvram_read_u16(prefix, NULL, "pa0b0", &sprom->pa0b0, 0, fallback);
+	nvram_read_u16(prefix, NULL, "pa0b1", &sprom->pa0b1, 0, fallback);
+	nvram_read_u16(prefix, NULL, "pa0b2", &sprom->pa0b2, 0, fallback);
+	nvram_read_u8(prefix, NULL, "pa0itssit", &sprom->itssi_bg, 0, fallback);
+	nvram_read_u8(prefix, NULL, "pa0maxpwr", &sprom->maxpwr_bg, 0,
+		      fallback);
+	nvram_read_u16(prefix, NULL, "pa1b0", &sprom->pa1b0, 0, fallback);
+	nvram_read_u16(prefix, NULL, "pa1b1", &sprom->pa1b1, 0, fallback);
+	nvram_read_u16(prefix, NULL, "pa1b2", &sprom->pa1b2, 0, fallback);
+	nvram_read_u8(prefix, NULL, "pa1itssit", &sprom->itssi_a, 0, fallback);
+	nvram_read_u8(prefix, NULL, "pa1maxpwr", &sprom->maxpwr_a, 0, fallback);
 }
 
-static void bcm47xx_fill_sprom_r1(struct ssb_sprom *sprom, const char *prefix)
+static void bcm47xx_fill_sprom_r1(struct ssb_sprom *sprom, const char *prefix,
+				  bool fallback)
 {
-	nvram_read_u16(prefix, NULL, "boardflags", &sprom->boardflags_lo, 0);
-	nvram_read_u8(prefix, NULL, "cc", &sprom->country_code, 0);
+	nvram_read_u16(prefix, NULL, "boardflags", &sprom->boardflags_lo, 0,
+		       fallback);
+	nvram_read_u8(prefix, NULL, "cc", &sprom->country_code, 0, fallback);
 }
 
 static void bcm47xx_fill_sprom_r2389(struct ssb_sprom *sprom,
-				     const char *prefix)
+				     const char *prefix, bool fallback)
 {
-	nvram_read_u8(prefix, NULL, "opo", &sprom->opo, 0);
-	nvram_read_u16(prefix, NULL, "pa1lob0", &sprom->pa1lob0, 0);
-	nvram_read_u16(prefix, NULL, "pa1lob1", &sprom->pa1lob1, 0);
-	nvram_read_u16(prefix, NULL, "pa1lob2", &sprom->pa1lob2, 0);
-	nvram_read_u16(prefix, NULL, "pa1hib0", &sprom->pa1hib0, 0);
-	nvram_read_u16(prefix, NULL, "pa1hib1", &sprom->pa1hib1, 0);
-	nvram_read_u16(prefix, NULL, "pa1hib2", &sprom->pa1hib2, 0);
-	nvram_read_u8(prefix, NULL, "pa1lomaxpwr", &sprom->maxpwr_al, 0);
-	nvram_read_u8(prefix, NULL, "pa1himaxpwr", &sprom->maxpwr_ah, 0);
+	nvram_read_u8(prefix, NULL, "opo", &sprom->opo, 0, fallback);
+	nvram_read_u16(prefix, NULL, "pa1lob0", &sprom->pa1lob0, 0, fallback);
+	nvram_read_u16(prefix, NULL, "pa1lob1", &sprom->pa1lob1, 0, fallback);
+	nvram_read_u16(prefix, NULL, "pa1lob2", &sprom->pa1lob2, 0, fallback);
+	nvram_read_u16(prefix, NULL, "pa1hib0", &sprom->pa1hib0, 0, fallback);
+	nvram_read_u16(prefix, NULL, "pa1hib1", &sprom->pa1hib1, 0, fallback);
+	nvram_read_u16(prefix, NULL, "pa1hib2", &sprom->pa1hib2, 0, fallback);
+	nvram_read_u8(prefix, NULL, "pa1lomaxpwr", &sprom->maxpwr_al, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "pa1himaxpwr", &sprom->maxpwr_ah, 0,
+		      fallback);
 }
 
-static void bcm47xx_fill_sprom_r389(struct ssb_sprom *sprom, const char *prefix)
+static void bcm47xx_fill_sprom_r389(struct ssb_sprom *sprom, const char *prefix,
+				    bool fallback)
 {
-	nvram_read_u8(prefix, NULL, "bxa2g", &sprom->bxa2g, 0);
-	nvram_read_u8(prefix, NULL, "rssisav2g", &sprom->rssisav2g, 0);
-	nvram_read_u8(prefix, NULL, "rssismc2g", &sprom->rssismc2g, 0);
-	nvram_read_u8(prefix, NULL, "rssismf2g", &sprom->rssismf2g, 0);
-	nvram_read_u8(prefix, NULL, "bxa5g", &sprom->bxa5g, 0);
-	nvram_read_u8(prefix, NULL, "rssisav5g", &sprom->rssisav5g, 0);
-	nvram_read_u8(prefix, NULL, "rssismc5g", &sprom->rssismc5g, 0);
-	nvram_read_u8(prefix, NULL, "rssismf5g", &sprom->rssismf5g, 0);
-	nvram_read_u8(prefix, NULL, "tri2g", &sprom->tri2g, 0);
-	nvram_read_u8(prefix, NULL, "tri5g", &sprom->tri5g, 0);
-	nvram_read_u8(prefix, NULL, "tri5gl", &sprom->tri5gl, 0);
-	nvram_read_u8(prefix, NULL, "tri5gh", &sprom->tri5gh, 0);
-	nvram_read_s8(prefix, NULL, "rxpo2g", &sprom->rxpo2g, 0);
-	nvram_read_s8(prefix, NULL, "rxpo5g", &sprom->rxpo5g, 0);
+	nvram_read_u8(prefix, NULL, "bxa2g", &sprom->bxa2g, 0, fallback);
+	nvram_read_u8(prefix, NULL, "rssisav2g", &sprom->rssisav2g, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "rssismc2g", &sprom->rssismc2g, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "rssismf2g", &sprom->rssismf2g, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "bxa5g", &sprom->bxa5g, 0, fallback);
+	nvram_read_u8(prefix, NULL, "rssisav5g", &sprom->rssisav5g, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "rssismc5g", &sprom->rssismc5g, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "rssismf5g", &sprom->rssismf5g, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "tri2g", &sprom->tri2g, 0, fallback);
+	nvram_read_u8(prefix, NULL, "tri5g", &sprom->tri5g, 0, fallback);
+	nvram_read_u8(prefix, NULL, "tri5gl", &sprom->tri5gl, 0, fallback);
+	nvram_read_u8(prefix, NULL, "tri5gh", &sprom->tri5gh, 0, fallback);
+	nvram_read_s8(prefix, NULL, "rxpo2g", &sprom->rxpo2g, 0, fallback);
+	nvram_read_s8(prefix, NULL, "rxpo5g", &sprom->rxpo5g, 0, fallback);
 }
 
-static void bcm47xx_fill_sprom_r3(struct ssb_sprom *sprom, const char *prefix)
+static void bcm47xx_fill_sprom_r3(struct ssb_sprom *sprom, const char *prefix,
+				  bool fallback)
 {
-	nvram_read_u8(prefix, NULL, "regrev", &sprom->regrev, 0);
+	nvram_read_u8(prefix, NULL, "regrev", &sprom->regrev, 0, fallback);
 	nvram_read_leddc(prefix, "leddc", &sprom->leddc_on_time,
-			 &sprom->leddc_off_time);
+			 &sprom->leddc_off_time, fallback);
 }
 
 static void bcm47xx_fill_sprom_r4589(struct ssb_sprom *sprom,
-				     const char *prefix)
+				     const char *prefix, bool fallback)
 {
-	nvram_read_u8(prefix, NULL, "regrev", &sprom->regrev, 0);
-	nvram_read_s8(prefix, NULL, "ag2", &sprom->antenna_gain.a2, 0);
-	nvram_read_s8(prefix, NULL, "ag3", &sprom->antenna_gain.a3, 0);
-	nvram_read_u8(prefix, NULL, "txchain", &sprom->txchain, 0xf);
-	nvram_read_u8(prefix, NULL, "rxchain", &sprom->rxchain, 0xf);
-	nvram_read_u8(prefix, NULL, "antswitch", &sprom->antswitch, 0xff);
+	nvram_read_u8(prefix, NULL, "regrev", &sprom->regrev, 0, fallback);
+	nvram_read_s8(prefix, NULL, "ag2", &sprom->antenna_gain.a2, 0,
+		      fallback);
+	nvram_read_s8(prefix, NULL, "ag3", &sprom->antenna_gain.a3, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "txchain", &sprom->txchain, 0xf, fallback);
+	nvram_read_u8(prefix, NULL, "rxchain", &sprom->rxchain, 0xf, fallback);
+	nvram_read_u8(prefix, NULL, "antswitch", &sprom->antswitch, 0xff,
+		      fallback);
 	nvram_read_leddc(prefix, "leddc", &sprom->leddc_on_time,
-			 &sprom->leddc_off_time);
+			 &sprom->leddc_off_time, fallback);
 }
 
-static void bcm47xx_fill_sprom_r458(struct ssb_sprom *sprom, const char *prefix)
+static void bcm47xx_fill_sprom_r458(struct ssb_sprom *sprom, const char *prefix,
+				    bool fallback)
 {
-	nvram_read_u16(prefix, NULL, "cck2gpo", &sprom->cck2gpo, 0);
-	nvram_read_u32(prefix, NULL, "ofdm2gpo", &sprom->ofdm2gpo, 0);
-	nvram_read_u32(prefix, NULL, "ofdm5gpo", &sprom->ofdm5gpo, 0);
-	nvram_read_u32(prefix, NULL, "ofdm5glpo", &sprom->ofdm5glpo, 0);
-	nvram_read_u32(prefix, NULL, "ofdm5ghpo", &sprom->ofdm5ghpo, 0);
-	nvram_read_u16(prefix, NULL, "cddpo", &sprom->cddpo, 0);
-	nvram_read_u16(prefix, NULL, "stbcpo", &sprom->stbcpo, 0);
-	nvram_read_u16(prefix, NULL, "bw40po", &sprom->bw40po, 0);
-	nvram_read_u16(prefix, NULL, "bwduppo", &sprom->bwduppo, 0);
-	nvram_read_u16(prefix, NULL, "mcs2gpo0", &sprom->mcs2gpo[0], 0);
-	nvram_read_u16(prefix, NULL, "mcs2gpo1", &sprom->mcs2gpo[1], 0);
-	nvram_read_u16(prefix, NULL, "mcs2gpo2", &sprom->mcs2gpo[2], 0);
-	nvram_read_u16(prefix, NULL, "mcs2gpo3", &sprom->mcs2gpo[3], 0);
-	nvram_read_u16(prefix, NULL, "mcs2gpo4", &sprom->mcs2gpo[4], 0);
-	nvram_read_u16(prefix, NULL, "mcs2gpo5", &sprom->mcs2gpo[5], 0);
-	nvram_read_u16(prefix, NULL, "mcs2gpo6", &sprom->mcs2gpo[6], 0);
-	nvram_read_u16(prefix, NULL, "mcs2gpo7", &sprom->mcs2gpo[7], 0);
-	nvram_read_u16(prefix, NULL, "mcs5gpo0", &sprom->mcs5gpo[0], 0);
-	nvram_read_u16(prefix, NULL, "mcs5gpo1", &sprom->mcs5gpo[1], 0);
-	nvram_read_u16(prefix, NULL, "mcs5gpo2", &sprom->mcs5gpo[2], 0);
-	nvram_read_u16(prefix, NULL, "mcs5gpo3", &sprom->mcs5gpo[3], 0);
-	nvram_read_u16(prefix, NULL, "mcs5gpo4", &sprom->mcs5gpo[4], 0);
-	nvram_read_u16(prefix, NULL, "mcs5gpo5", &sprom->mcs5gpo[5], 0);
-	nvram_read_u16(prefix, NULL, "mcs5gpo6", &sprom->mcs5gpo[6], 0);
-	nvram_read_u16(prefix, NULL, "mcs5gpo7", &sprom->mcs5gpo[7], 0);
-	nvram_read_u16(prefix, NULL, "mcs5glpo0", &sprom->mcs5glpo[0], 0);
-	nvram_read_u16(prefix, NULL, "mcs5glpo1", &sprom->mcs5glpo[1], 0);
-	nvram_read_u16(prefix, NULL, "mcs5glpo2", &sprom->mcs5glpo[2], 0);
-	nvram_read_u16(prefix, NULL, "mcs5glpo3", &sprom->mcs5glpo[3], 0);
-	nvram_read_u16(prefix, NULL, "mcs5glpo4", &sprom->mcs5glpo[4], 0);
-	nvram_read_u16(prefix, NULL, "mcs5glpo5", &sprom->mcs5glpo[5], 0);
-	nvram_read_u16(prefix, NULL, "mcs5glpo6", &sprom->mcs5glpo[6], 0);
-	nvram_read_u16(prefix, NULL, "mcs5glpo7", &sprom->mcs5glpo[7], 0);
-	nvram_read_u16(prefix, NULL, "mcs5ghpo0", &sprom->mcs5ghpo[0], 0);
-	nvram_read_u16(prefix, NULL, "mcs5ghpo1", &sprom->mcs5ghpo[1], 0);
-	nvram_read_u16(prefix, NULL, "mcs5ghpo2", &sprom->mcs5ghpo[2], 0);
-	nvram_read_u16(prefix, NULL, "mcs5ghpo3", &sprom->mcs5ghpo[3], 0);
-	nvram_read_u16(prefix, NULL, "mcs5ghpo4", &sprom->mcs5ghpo[4], 0);
-	nvram_read_u16(prefix, NULL, "mcs5ghpo5", &sprom->mcs5ghpo[5], 0);
-	nvram_read_u16(prefix, NULL, "mcs5ghpo6", &sprom->mcs5ghpo[6], 0);
-	nvram_read_u16(prefix, NULL, "mcs5ghpo7", &sprom->mcs5ghpo[7], 0);
+	nvram_read_u16(prefix, NULL, "cck2gpo", &sprom->cck2gpo, 0, fallback);
+	nvram_read_u32(prefix, NULL, "ofdm2gpo", &sprom->ofdm2gpo, 0, fallback);
+	nvram_read_u32(prefix, NULL, "ofdm5gpo", &sprom->ofdm5gpo, 0, fallback);
+	nvram_read_u32(prefix, NULL, "ofdm5glpo", &sprom->ofdm5glpo, 0,
+		       fallback);
+	nvram_read_u32(prefix, NULL, "ofdm5ghpo", &sprom->ofdm5ghpo, 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "cddpo", &sprom->cddpo, 0, fallback);
+	nvram_read_u16(prefix, NULL, "stbcpo", &sprom->stbcpo, 0, fallback);
+	nvram_read_u16(prefix, NULL, "bw40po", &sprom->bw40po, 0, fallback);
+	nvram_read_u16(prefix, NULL, "bwduppo", &sprom->bwduppo, 0, fallback);
+	nvram_read_u16(prefix, NULL, "mcs2gpo0", &sprom->mcs2gpo[0], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs2gpo1", &sprom->mcs2gpo[1], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs2gpo2", &sprom->mcs2gpo[2], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs2gpo3", &sprom->mcs2gpo[3], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs2gpo4", &sprom->mcs2gpo[4], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs2gpo5", &sprom->mcs2gpo[5], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs2gpo6", &sprom->mcs2gpo[6], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs2gpo7", &sprom->mcs2gpo[7], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5gpo0", &sprom->mcs5gpo[0], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5gpo1", &sprom->mcs5gpo[1], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5gpo2", &sprom->mcs5gpo[2], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5gpo3", &sprom->mcs5gpo[3], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5gpo4", &sprom->mcs5gpo[4], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5gpo5", &sprom->mcs5gpo[5], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5gpo6", &sprom->mcs5gpo[6], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5gpo7", &sprom->mcs5gpo[7], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5glpo0", &sprom->mcs5glpo[0], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5glpo1", &sprom->mcs5glpo[1], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5glpo2", &sprom->mcs5glpo[2], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5glpo3", &sprom->mcs5glpo[3], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5glpo4", &sprom->mcs5glpo[4], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5glpo5", &sprom->mcs5glpo[5], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5glpo6", &sprom->mcs5glpo[6], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5glpo7", &sprom->mcs5glpo[7], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5ghpo0", &sprom->mcs5ghpo[0], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5ghpo1", &sprom->mcs5ghpo[1], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5ghpo2", &sprom->mcs5ghpo[2], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5ghpo3", &sprom->mcs5ghpo[3], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5ghpo4", &sprom->mcs5ghpo[4], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5ghpo5", &sprom->mcs5ghpo[5], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5ghpo6", &sprom->mcs5ghpo[6], 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs5ghpo7", &sprom->mcs5ghpo[7], 0,
+		       fallback);
 }
 
-static void bcm47xx_fill_sprom_r45(struct ssb_sprom *sprom, const char *prefix)
+static void bcm47xx_fill_sprom_r45(struct ssb_sprom *sprom, const char *prefix,
+				   bool fallback)
 {
-	nvram_read_u8(prefix, NULL, "txpid2ga0", &sprom->txpid2g[0], 0);
-	nvram_read_u8(prefix, NULL, "txpid2ga1", &sprom->txpid2g[1], 0);
-	nvram_read_u8(prefix, NULL, "txpid2ga2", &sprom->txpid2g[2], 0);
-	nvram_read_u8(prefix, NULL, "txpid2ga3", &sprom->txpid2g[3], 0);
-	nvram_read_u8(prefix, NULL, "txpid5ga0", &sprom->txpid5g[0], 0);
-	nvram_read_u8(prefix, NULL, "txpid5ga1", &sprom->txpid5g[1], 0);
-	nvram_read_u8(prefix, NULL, "txpid5ga2", &sprom->txpid5g[2], 0);
-	nvram_read_u8(prefix, NULL, "txpid5ga3", &sprom->txpid5g[3], 0);
-	nvram_read_u8(prefix, NULL, "txpid5gla0", &sprom->txpid5gl[0], 0);
-	nvram_read_u8(prefix, NULL, "txpid5gla1", &sprom->txpid5gl[1], 0);
-	nvram_read_u8(prefix, NULL, "txpid5gla2", &sprom->txpid5gl[2], 0);
-	nvram_read_u8(prefix, NULL, "txpid5gla3", &sprom->txpid5gl[3], 0);
-	nvram_read_u8(prefix, NULL, "txpid5gha0", &sprom->txpid5gh[0], 0);
-	nvram_read_u8(prefix, NULL, "txpid5gha1", &sprom->txpid5gh[1], 0);
-	nvram_read_u8(prefix, NULL, "txpid5gha2", &sprom->txpid5gh[2], 0);
-	nvram_read_u8(prefix, NULL, "txpid5gha3", &sprom->txpid5gh[3], 0);
+	nvram_read_u8(prefix, NULL, "txpid2ga0", &sprom->txpid2g[0], 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "txpid2ga1", &sprom->txpid2g[1], 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "txpid2ga2", &sprom->txpid2g[2], 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "txpid2ga3", &sprom->txpid2g[3], 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "txpid5ga0", &sprom->txpid5g[0], 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "txpid5ga1", &sprom->txpid5g[1], 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "txpid5ga2", &sprom->txpid5g[2], 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "txpid5ga3", &sprom->txpid5g[3], 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "txpid5gla0", &sprom->txpid5gl[0], 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "txpid5gla1", &sprom->txpid5gl[1], 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "txpid5gla2", &sprom->txpid5gl[2], 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "txpid5gla3", &sprom->txpid5gl[3], 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "txpid5gha0", &sprom->txpid5gh[0], 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "txpid5gha1", &sprom->txpid5gh[1], 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "txpid5gha2", &sprom->txpid5gh[2], 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "txpid5gha3", &sprom->txpid5gh[3], 0,
+		      fallback);
 }
 
-static void bcm47xx_fill_sprom_r89(struct ssb_sprom *sprom, const char *prefix)
+static void bcm47xx_fill_sprom_r89(struct ssb_sprom *sprom, const char *prefix,
+				   bool fallback)
 {
-	nvram_read_u8(prefix, NULL, "tssipos2g", &sprom->fem.ghz2.tssipos, 0);
+	nvram_read_u8(prefix, NULL, "tssipos2g", &sprom->fem.ghz2.tssipos, 0,
+		      fallback);
 	nvram_read_u8(prefix, NULL, "extpagain2g",
-		      &sprom->fem.ghz2.extpa_gain, 0);
+		      &sprom->fem.ghz2.extpa_gain, 0, fallback);
 	nvram_read_u8(prefix, NULL, "pdetrange2g",
-		      &sprom->fem.ghz2.pdet_range, 0);
-	nvram_read_u8(prefix, NULL, "triso2g", &sprom->fem.ghz2.tr_iso, 0);
-	nvram_read_u8(prefix, NULL, "antswctl2g", &sprom->fem.ghz2.antswlut, 0);
-	nvram_read_u8(prefix, NULL, "tssipos5g", &sprom->fem.ghz5.tssipos, 0);
+		      &sprom->fem.ghz2.pdet_range, 0, fallback);
+	nvram_read_u8(prefix, NULL, "triso2g", &sprom->fem.ghz2.tr_iso, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "antswctl2g", &sprom->fem.ghz2.antswlut, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "tssipos5g", &sprom->fem.ghz5.tssipos, 0,
+		      fallback);
 	nvram_read_u8(prefix, NULL, "extpagain5g",
-		      &sprom->fem.ghz5.extpa_gain, 0);
+		      &sprom->fem.ghz5.extpa_gain, 0, fallback);
 	nvram_read_u8(prefix, NULL, "pdetrange5g",
-		      &sprom->fem.ghz5.pdet_range, 0);
-	nvram_read_u8(prefix, NULL, "triso5g", &sprom->fem.ghz5.tr_iso, 0);
-	nvram_read_u8(prefix, NULL, "antswctl5g", &sprom->fem.ghz5.antswlut, 0);
-	nvram_read_u8(prefix, NULL, "tempthresh", &sprom->tempthresh, 0);
-	nvram_read_u8(prefix, NULL, "tempoffset", &sprom->tempoffset, 0);
-	nvram_read_u16(prefix, NULL, "rawtempsense", &sprom->rawtempsense, 0);
-	nvram_read_u8(prefix, NULL, "measpower", &sprom->measpower, 0);
+		      &sprom->fem.ghz5.pdet_range, 0, fallback);
+	nvram_read_u8(prefix, NULL, "triso5g", &sprom->fem.ghz5.tr_iso, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "antswctl5g", &sprom->fem.ghz5.antswlut, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "tempthresh", &sprom->tempthresh, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "tempoffset", &sprom->tempoffset, 0,
+		      fallback);
+	nvram_read_u16(prefix, NULL, "rawtempsense", &sprom->rawtempsense, 0,
+		       fallback);
+	nvram_read_u8(prefix, NULL, "measpower", &sprom->measpower, 0,
+		      fallback);
 	nvram_read_u8(prefix, NULL, "tempsense_slope",
-		      &sprom->tempsense_slope, 0);
-	nvram_read_u8(prefix, NULL, "tempcorrx", &sprom->tempcorrx, 0);
+		      &sprom->tempsense_slope, 0, fallback);
+	nvram_read_u8(prefix, NULL, "tempcorrx", &sprom->tempcorrx, 0,
+		       fallback);
 	nvram_read_u8(prefix, NULL, "tempsense_option",
-		      &sprom->tempsense_option, 0);
+		      &sprom->tempsense_option, 0, fallback);
 	nvram_read_u8(prefix, NULL, "freqoffset_corr",
-		      &sprom->freqoffset_corr, 0);
-	nvram_read_u8(prefix, NULL, "iqcal_swp_dis", &sprom->iqcal_swp_dis, 0);
-	nvram_read_u8(prefix, NULL, "hw_iqcal_en", &sprom->hw_iqcal_en, 0);
-	nvram_read_u8(prefix, NULL, "elna2g", &sprom->elna2g, 0);
-	nvram_read_u8(prefix, NULL, "elna5g", &sprom->elna5g, 0);
+		      &sprom->freqoffset_corr, 0, fallback);
+	nvram_read_u8(prefix, NULL, "iqcal_swp_dis", &sprom->iqcal_swp_dis, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "hw_iqcal_en", &sprom->hw_iqcal_en, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "elna2g", &sprom->elna2g, 0, fallback);
+	nvram_read_u8(prefix, NULL, "elna5g", &sprom->elna5g, 0, fallback);
 	nvram_read_u8(prefix, NULL, "phycal_tempdelta",
-		      &sprom->phycal_tempdelta, 0);
-	nvram_read_u8(prefix, NULL, "temps_period", &sprom->temps_period, 0);
+		      &sprom->phycal_tempdelta, 0, fallback);
+	nvram_read_u8(prefix, NULL, "temps_period", &sprom->temps_period, 0,
+		      fallback);
 	nvram_read_u8(prefix, NULL, "temps_hysteresis",
-		      &sprom->temps_hysteresis, 0);
-	nvram_read_u8(prefix, NULL, "measpower1", &sprom->measpower1, 0);
-	nvram_read_u8(prefix, NULL, "measpower2", &sprom->measpower2, 0);
+		      &sprom->temps_hysteresis, 0, fallback);
+	nvram_read_u8(prefix, NULL, "measpower1", &sprom->measpower1, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "measpower2", &sprom->measpower2, 0,
+		      fallback);
 	nvram_read_u8(prefix, NULL, "rxgainerr2ga0",
-		      &sprom->rxgainerr2ga[0], 0);
+		      &sprom->rxgainerr2ga[0], 0, fallback);
 	nvram_read_u8(prefix, NULL, "rxgainerr2ga1",
-		      &sprom->rxgainerr2ga[1], 0);
+		      &sprom->rxgainerr2ga[1], 0, fallback);
 	nvram_read_u8(prefix, NULL, "rxgainerr2ga2",
-		      &sprom->rxgainerr2ga[2], 0);
+		      &sprom->rxgainerr2ga[2], 0, fallback);
 	nvram_read_u8(prefix, NULL, "rxgainerr5gla0",
-		      &sprom->rxgainerr5gla[0], 0);
+		      &sprom->rxgainerr5gla[0], 0, fallback);
 	nvram_read_u8(prefix, NULL, "rxgainerr5gla1",
-		      &sprom->rxgainerr5gla[1], 0);
+		      &sprom->rxgainerr5gla[1], 0, fallback);
 	nvram_read_u8(prefix, NULL, "rxgainerr5gla2",
-		      &sprom->rxgainerr5gla[2], 0);
+		      &sprom->rxgainerr5gla[2], 0, fallback);
 	nvram_read_u8(prefix, NULL, "rxgainerr5gma0",
-		      &sprom->rxgainerr5gma[0], 0);
+		      &sprom->rxgainerr5gma[0], 0, fallback);
 	nvram_read_u8(prefix, NULL, "rxgainerr5gma1",
-		      &sprom->rxgainerr5gma[1], 0);
+		      &sprom->rxgainerr5gma[1], 0, fallback);
 	nvram_read_u8(prefix, NULL, "rxgainerr5gma2",
-		      &sprom->rxgainerr5gma[2], 0);
+		      &sprom->rxgainerr5gma[2], 0, fallback);
 	nvram_read_u8(prefix, NULL, "rxgainerr5gha0",
-		      &sprom->rxgainerr5gha[0], 0);
+		      &sprom->rxgainerr5gha[0], 0, fallback);
 	nvram_read_u8(prefix, NULL, "rxgainerr5gha1",
-		      &sprom->rxgainerr5gha[1], 0);
+		      &sprom->rxgainerr5gha[1], 0, fallback);
 	nvram_read_u8(prefix, NULL, "rxgainerr5gha2",
-		      &sprom->rxgainerr5gha[2], 0);
+		      &sprom->rxgainerr5gha[2], 0, fallback);
 	nvram_read_u8(prefix, NULL, "rxgainerr5gua0",
-		      &sprom->rxgainerr5gua[0], 0);
+		      &sprom->rxgainerr5gua[0], 0, fallback);
 	nvram_read_u8(prefix, NULL, "rxgainerr5gua1",
-		      &sprom->rxgainerr5gua[1], 0);
+		      &sprom->rxgainerr5gua[1], 0, fallback);
 	nvram_read_u8(prefix, NULL, "rxgainerr5gua2",
-		      &sprom->rxgainerr5gua[2], 0);
-	nvram_read_u8(prefix, NULL, "noiselvl2ga0", &sprom->noiselvl2ga[0], 0);
-	nvram_read_u8(prefix, NULL, "noiselvl2ga1", &sprom->noiselvl2ga[1], 0);
-	nvram_read_u8(prefix, NULL, "noiselvl2ga2", &sprom->noiselvl2ga[2], 0);
+		      &sprom->rxgainerr5gua[2], 0, fallback);
+	nvram_read_u8(prefix, NULL, "noiselvl2ga0", &sprom->noiselvl2ga[0], 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "noiselvl2ga1", &sprom->noiselvl2ga[1], 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "noiselvl2ga2", &sprom->noiselvl2ga[2], 0,
+		      fallback);
 	nvram_read_u8(prefix, NULL, "noiselvl5gla0",
-		      &sprom->noiselvl5gla[0], 0);
+		      &sprom->noiselvl5gla[0], 0, fallback);
 	nvram_read_u8(prefix, NULL, "noiselvl5gla1",
-		      &sprom->noiselvl5gla[1], 0);
+		      &sprom->noiselvl5gla[1], 0, fallback);
 	nvram_read_u8(prefix, NULL, "noiselvl5gla2",
-		      &sprom->noiselvl5gla[2], 0);
+		      &sprom->noiselvl5gla[2], 0, fallback);
 	nvram_read_u8(prefix, NULL, "noiselvl5gma0",
-		      &sprom->noiselvl5gma[0], 0);
+		      &sprom->noiselvl5gma[0], 0, fallback);
 	nvram_read_u8(prefix, NULL, "noiselvl5gma1",
-		      &sprom->noiselvl5gma[1], 0);
+		      &sprom->noiselvl5gma[1], 0, fallback);
 	nvram_read_u8(prefix, NULL, "noiselvl5gma2",
-		      &sprom->noiselvl5gma[2], 0);
+		      &sprom->noiselvl5gma[2], 0, fallback);
 	nvram_read_u8(prefix, NULL, "noiselvl5gha0",
-		      &sprom->noiselvl5gha[0], 0);
+		      &sprom->noiselvl5gha[0], 0, fallback);
 	nvram_read_u8(prefix, NULL, "noiselvl5gha1",
-		      &sprom->noiselvl5gha[1], 0);
+		      &sprom->noiselvl5gha[1], 0, fallback);
 	nvram_read_u8(prefix, NULL, "noiselvl5gha2",
-		      &sprom->noiselvl5gha[2], 0);
+		      &sprom->noiselvl5gha[2], 0, fallback);
 	nvram_read_u8(prefix, NULL, "noiselvl5gua0",
-		      &sprom->noiselvl5gua[0], 0);
+		      &sprom->noiselvl5gua[0], 0, fallback);
 	nvram_read_u8(prefix, NULL, "noiselvl5gua1",
-		      &sprom->noiselvl5gua[1], 0);
+		      &sprom->noiselvl5gua[1], 0, fallback);
 	nvram_read_u8(prefix, NULL, "noiselvl5gua2",
-		      &sprom->noiselvl5gua[2], 0);
+		      &sprom->noiselvl5gua[2], 0, fallback);
 	nvram_read_u8(prefix, NULL, "pcieingress_war",
-		      &sprom->pcieingress_war, 0);
+		      &sprom->pcieingress_war, 0, fallback);
 }
 
-static void bcm47xx_fill_sprom_r9(struct ssb_sprom *sprom, const char *prefix)
+static void bcm47xx_fill_sprom_r9(struct ssb_sprom *sprom, const char *prefix,
+				  bool fallback)
 {
-	nvram_read_u16(prefix, NULL, "cckbw202gpo", &sprom->cckbw202gpo, 0);
-	nvram_read_u16(prefix, NULL, "cckbw20ul2gpo", &sprom->cckbw20ul2gpo, 0);
+	nvram_read_u16(prefix, NULL, "cckbw202gpo", &sprom->cckbw202gpo, 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "cckbw20ul2gpo", &sprom->cckbw20ul2gpo, 0,
+		       fallback);
 	nvram_read_u32(prefix, NULL, "legofdmbw202gpo",
-		       &sprom->legofdmbw202gpo, 0);
+		       &sprom->legofdmbw202gpo, 0, fallback);
 	nvram_read_u32(prefix, NULL, "legofdmbw20ul2gpo",
-		       &sprom->legofdmbw20ul2gpo, 0);
+		       &sprom->legofdmbw20ul2gpo, 0, fallback);
 	nvram_read_u32(prefix, NULL, "legofdmbw205glpo",
-		       &sprom->legofdmbw205glpo, 0);
+		       &sprom->legofdmbw205glpo, 0, fallback);
 	nvram_read_u32(prefix, NULL, "legofdmbw20ul5glpo",
-		       &sprom->legofdmbw20ul5glpo, 0);
+		       &sprom->legofdmbw20ul5glpo, 0, fallback);
 	nvram_read_u32(prefix, NULL, "legofdmbw205gmpo",
-		       &sprom->legofdmbw205gmpo, 0);
+		       &sprom->legofdmbw205gmpo, 0, fallback);
 	nvram_read_u32(prefix, NULL, "legofdmbw20ul5gmpo",
-		       &sprom->legofdmbw20ul5gmpo, 0);
+		       &sprom->legofdmbw20ul5gmpo, 0, fallback);
 	nvram_read_u32(prefix, NULL, "legofdmbw205ghpo",
-		       &sprom->legofdmbw205ghpo, 0);
+		       &sprom->legofdmbw205ghpo, 0, fallback);
 	nvram_read_u32(prefix, NULL, "legofdmbw20ul5ghpo",
-		       &sprom->legofdmbw20ul5ghpo, 0);
-	nvram_read_u32(prefix, NULL, "mcsbw202gpo", &sprom->mcsbw202gpo, 0);
-	nvram_read_u32(prefix, NULL, "mcsbw20ul2gpo", &sprom->mcsbw20ul2gpo, 0);
-	nvram_read_u32(prefix, NULL, "mcsbw402gpo", &sprom->mcsbw402gpo, 0);
-	nvram_read_u32(prefix, NULL, "mcsbw205glpo", &sprom->mcsbw205glpo, 0);
+		       &sprom->legofdmbw20ul5ghpo, 0, fallback);
+	nvram_read_u32(prefix, NULL, "mcsbw202gpo", &sprom->mcsbw202gpo, 0,
+		       fallback);
+	nvram_read_u32(prefix, NULL, "mcsbw20ul2gpo", &sprom->mcsbw20ul2gpo, 0,
+		       fallback);
+	nvram_read_u32(prefix, NULL, "mcsbw402gpo", &sprom->mcsbw402gpo, 0,
+		       fallback);
+	nvram_read_u32(prefix, NULL, "mcsbw205glpo", &sprom->mcsbw205glpo, 0,
+		       fallback);
 	nvram_read_u32(prefix, NULL, "mcsbw20ul5glpo",
-		       &sprom->mcsbw20ul5glpo, 0);
-	nvram_read_u32(prefix, NULL, "mcsbw405glpo", &sprom->mcsbw405glpo, 0);
-	nvram_read_u32(prefix, NULL, "mcsbw205gmpo", &sprom->mcsbw205gmpo, 0);
+		       &sprom->mcsbw20ul5glpo, 0, fallback);
+	nvram_read_u32(prefix, NULL, "mcsbw405glpo", &sprom->mcsbw405glpo, 0,
+		       fallback);
+	nvram_read_u32(prefix, NULL, "mcsbw205gmpo", &sprom->mcsbw205gmpo, 0,
+		       fallback);
 	nvram_read_u32(prefix, NULL, "mcsbw20ul5gmpo",
-		       &sprom->mcsbw20ul5gmpo, 0);
-	nvram_read_u32(prefix, NULL, "mcsbw405gmpo", &sprom->mcsbw405gmpo, 0);
-	nvram_read_u32(prefix, NULL, "mcsbw205ghpo", &sprom->mcsbw205ghpo, 0);
+		       &sprom->mcsbw20ul5gmpo, 0, fallback);
+	nvram_read_u32(prefix, NULL, "mcsbw405gmpo", &sprom->mcsbw405gmpo, 0,
+		       fallback);
+	nvram_read_u32(prefix, NULL, "mcsbw205ghpo", &sprom->mcsbw205ghpo, 0,
+		       fallback);
 	nvram_read_u32(prefix, NULL, "mcsbw20ul5ghpo",
-		       &sprom->mcsbw20ul5ghpo, 0);
-	nvram_read_u32(prefix, NULL, "mcsbw405ghpo", &sprom->mcsbw405ghpo, 0);
-	nvram_read_u16(prefix, NULL, "mcs32po", &sprom->mcs32po, 0);
+		       &sprom->mcsbw20ul5ghpo, 0, fallback);
+	nvram_read_u32(prefix, NULL, "mcsbw405ghpo", &sprom->mcsbw405ghpo, 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "mcs32po", &sprom->mcs32po, 0, fallback);
 	nvram_read_u16(prefix, NULL, "legofdm40duppo",
-		       &sprom->legofdm40duppo, 0);
-	nvram_read_u8(prefix, NULL, "sar2g", &sprom->sar2g, 0);
-	nvram_read_u8(prefix, NULL, "sar5g", &sprom->sar5g, 0);
+		       &sprom->legofdm40duppo, 0, fallback);
+	nvram_read_u8(prefix, NULL, "sar2g", &sprom->sar2g, 0, fallback);
+	nvram_read_u8(prefix, NULL, "sar5g", &sprom->sar5g, 0, fallback);
 }
 
 static void bcm47xx_fill_sprom_path_r4589(struct ssb_sprom *sprom,
-					  const char *prefix)
+					  const char *prefix, bool fallback)
 {
 	char postfix[2];
 	int i;
@@ -464,46 +572,46 @@ static void bcm47xx_fill_sprom_path_r4589(struct ssb_sprom *sprom,
 		struct ssb_sprom_core_pwr_info *pwr_info = &sprom->core_pwr_info[i];
 		snprintf(postfix, sizeof(postfix), "%i", i);
 		nvram_read_u8(prefix, postfix, "maxp2ga",
-			      &pwr_info->maxpwr_2g, 0);
+			      &pwr_info->maxpwr_2g, 0, fallback);
 		nvram_read_u8(prefix, postfix, "itt2ga",
-			      &pwr_info->itssi_2g, 0);
+			      &pwr_info->itssi_2g, 0, fallback);
 		nvram_read_u8(prefix, postfix, "itt5ga",
-			      &pwr_info->itssi_5g, 0);
+			      &pwr_info->itssi_5g, 0, fallback);
 		nvram_read_u16(prefix, postfix, "pa2gw0a",
-			       &pwr_info->pa_2g[0], 0);
+			       &pwr_info->pa_2g[0], 0, fallback);
 		nvram_read_u16(prefix, postfix, "pa2gw1a",
-			       &pwr_info->pa_2g[1], 0);
+			       &pwr_info->pa_2g[1], 0, fallback);
 		nvram_read_u16(prefix, postfix, "pa2gw2a",
-			       &pwr_info->pa_2g[2], 0);
+			       &pwr_info->pa_2g[2], 0, fallback);
 		nvram_read_u8(prefix, postfix, "maxp5ga",
-			      &pwr_info->maxpwr_5g, 0);
+			      &pwr_info->maxpwr_5g, 0, fallback);
 		nvram_read_u8(prefix, postfix, "maxp5gha",
-			      &pwr_info->maxpwr_5gh, 0);
+			      &pwr_info->maxpwr_5gh, 0, fallback);
 		nvram_read_u8(prefix, postfix, "maxp5gla",
-			      &pwr_info->maxpwr_5gl, 0);
+			      &pwr_info->maxpwr_5gl, 0, fallback);
 		nvram_read_u16(prefix, postfix, "pa5gw0a",
-			       &pwr_info->pa_5g[0], 0);
+			       &pwr_info->pa_5g[0], 0, fallback);
 		nvram_read_u16(prefix, postfix, "pa5gw1a",
-			       &pwr_info->pa_5g[1], 0);
+			       &pwr_info->pa_5g[1], 0, fallback);
 		nvram_read_u16(prefix, postfix, "pa5gw2a",
-			       &pwr_info->pa_5g[2], 0);
+			       &pwr_info->pa_5g[2], 0, fallback);
 		nvram_read_u16(prefix, postfix, "pa5glw0a",
-			       &pwr_info->pa_5gl[0], 0);
+			       &pwr_info->pa_5gl[0], 0, fallback);
 		nvram_read_u16(prefix, postfix, "pa5glw1a",
-			       &pwr_info->pa_5gl[1], 0);
+			       &pwr_info->pa_5gl[1], 0, fallback);
 		nvram_read_u16(prefix, postfix, "pa5glw2a",
-			       &pwr_info->pa_5gl[2], 0);
+			       &pwr_info->pa_5gl[2], 0, fallback);
 		nvram_read_u16(prefix, postfix, "pa5ghw0a",
-			       &pwr_info->pa_5gh[0], 0);
+			       &pwr_info->pa_5gh[0], 0, fallback);
 		nvram_read_u16(prefix, postfix, "pa5ghw1a",
-			       &pwr_info->pa_5gh[1], 0);
+			       &pwr_info->pa_5gh[1], 0, fallback);
 		nvram_read_u16(prefix, postfix, "pa5ghw2a",
-			       &pwr_info->pa_5gh[2], 0);
+			       &pwr_info->pa_5gh[2], 0, fallback);
 	}
 }
 
 static void bcm47xx_fill_sprom_path_r45(struct ssb_sprom *sprom,
-					const char *prefix)
+					const char *prefix, bool fallback)
 {
 	char postfix[2];
 	int i;
@@ -512,104 +620,112 @@ static void bcm47xx_fill_sprom_path_r45(struct ssb_sprom *sprom,
 		struct ssb_sprom_core_pwr_info *pwr_info = &sprom->core_pwr_info[i];
 		snprintf(postfix, sizeof(postfix), "%i", i);
 		nvram_read_u16(prefix, postfix, "pa2gw3a",
-			       &pwr_info->pa_2g[3], 0);
+			       &pwr_info->pa_2g[3], 0, fallback);
 		nvram_read_u16(prefix, postfix, "pa5gw3a",
-			       &pwr_info->pa_5g[3], 0);
+			       &pwr_info->pa_5g[3], 0, fallback);
 		nvram_read_u16(prefix, postfix, "pa5glw3a",
-			       &pwr_info->pa_5gl[3], 0);
+			       &pwr_info->pa_5gl[3], 0, fallback);
 		nvram_read_u16(prefix, postfix, "pa5ghw3a",
-			       &pwr_info->pa_5gh[3], 0);
+			       &pwr_info->pa_5gh[3], 0, fallback);
 	}
 }
 
-void bcm47xx_fill_sprom_ethernet(struct ssb_sprom *sprom, const char *prefix)
+static void bcm47xx_fill_sprom_ethernet(struct ssb_sprom *sprom,
+					const char *prefix, bool fallback)
 {
-	nvram_read_macaddr(prefix, "et0macaddr", &sprom->et0mac);
-	nvram_read_u8(prefix, NULL, "et0mdcport", &sprom->et0mdcport, 0);
-	nvram_read_u8(prefix, NULL, "et0phyaddr", &sprom->et0phyaddr, 0);
-
-	nvram_read_macaddr(prefix, "et1macaddr", &sprom->et1mac);
-	nvram_read_u8(prefix, NULL, "et1mdcport", &sprom->et1mdcport, 0);
-	nvram_read_u8(prefix, NULL, "et1phyaddr", &sprom->et1phyaddr, 0);
-
-	nvram_read_macaddr(prefix, "macaddr", &sprom->il0mac);
-	nvram_read_macaddr(prefix, "il0macaddr", &sprom->il0mac);
+	nvram_read_macaddr(prefix, "et0macaddr", &sprom->et0mac, fallback);
+	nvram_read_u8(prefix, NULL, "et0mdcport", &sprom->et0mdcport, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "et0phyaddr", &sprom->et0phyaddr, 0,
+		      fallback);
+
+	nvram_read_macaddr(prefix, "et1macaddr", &sprom->et1mac, fallback);
+	nvram_read_u8(prefix, NULL, "et1mdcport", &sprom->et1mdcport, 0,
+		      fallback);
+	nvram_read_u8(prefix, NULL, "et1phyaddr", &sprom->et1phyaddr, 0,
+		      fallback);
+
+	nvram_read_macaddr(prefix, "macaddr", &sprom->il0mac, fallback);
+	nvram_read_macaddr(prefix, "il0macaddr", &sprom->il0mac, fallback);
 }
 
-static void bcm47xx_fill_board_data(struct ssb_sprom *sprom, const char *prefix)
+static void bcm47xx_fill_board_data(struct ssb_sprom *sprom, const char *prefix,
+				    bool fallback)
 {
-	nvram_read_u16(prefix, NULL, "boardrev", &sprom->board_rev, 0);
-	if (!sprom->board_rev)
-		nvram_read_u16(NULL, NULL, "boardrev", &sprom->board_rev, 0);
-	nvram_read_u16(prefix, NULL, "boardnum", &sprom->board_num, 0);
-	nvram_read_u16(prefix, NULL, "boardtype", &sprom->board_type, 0);
+	nvram_read_u16(prefix, NULL, "boardrev", &sprom->board_rev, 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "boardnum", &sprom->board_num, 0,
+		       fallback);
+	nvram_read_u16(prefix, NULL, "boardtype", &sprom->board_type, 0,
+		       fallback);
 	nvram_read_u32_2(prefix, "boardflags", &sprom->boardflags_lo,
-			 &sprom->boardflags_hi);
+			 &sprom->boardflags_hi, fallback);
 	nvram_read_u32_2(prefix, "boardflags2", &sprom->boardflags2_lo,
-			 &sprom->boardflags2_hi);
+			 &sprom->boardflags2_hi, fallback);
 }
 
-void bcm47xx_fill_sprom(struct ssb_sprom *sprom, const char *prefix)
+void bcm47xx_fill_sprom(struct ssb_sprom *sprom, const char *prefix,
+			bool fallback)
 {
-	bcm47xx_fill_sprom_ethernet(sprom, prefix);
-	bcm47xx_fill_board_data(sprom, prefix);
+	bcm47xx_fill_sprom_ethernet(sprom, prefix, fallback);
+	bcm47xx_fill_board_data(sprom, prefix, fallback);
 
-	nvram_read_u8(prefix, NULL, "sromrev", &sprom->revision, 0);
+	nvram_read_u8(prefix, NULL, "sromrev", &sprom->revision, 0, fallback);
 
 	switch (sprom->revision) {
 	case 1:
-		bcm47xx_fill_sprom_r1234589(sprom, prefix);
-		bcm47xx_fill_sprom_r12389(sprom, prefix);
-		bcm47xx_fill_sprom_r1(sprom, prefix);
+		bcm47xx_fill_sprom_r1234589(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r12389(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r1(sprom, prefix, fallback);
 		break;
 	case 2:
-		bcm47xx_fill_sprom_r1234589(sprom, prefix);
-		bcm47xx_fill_sprom_r12389(sprom, prefix);
-		bcm47xx_fill_sprom_r2389(sprom, prefix);
+		bcm47xx_fill_sprom_r1234589(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r12389(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r2389(sprom, prefix, fallback);
 		break;
 	case 3:
-		bcm47xx_fill_sprom_r1234589(sprom, prefix);
-		bcm47xx_fill_sprom_r12389(sprom, prefix);
-		bcm47xx_fill_sprom_r2389(sprom, prefix);
-		bcm47xx_fill_sprom_r389(sprom, prefix);
-		bcm47xx_fill_sprom_r3(sprom, prefix);
+		bcm47xx_fill_sprom_r1234589(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r12389(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r2389(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r389(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r3(sprom, prefix, fallback);
 		break;
 	case 4:
 	case 5:
-		bcm47xx_fill_sprom_r1234589(sprom, prefix);
-		bcm47xx_fill_sprom_r4589(sprom, prefix);
-		bcm47xx_fill_sprom_r458(sprom, prefix);
-		bcm47xx_fill_sprom_r45(sprom, prefix);
-		bcm47xx_fill_sprom_path_r4589(sprom, prefix);
-		bcm47xx_fill_sprom_path_r45(sprom, prefix);
+		bcm47xx_fill_sprom_r1234589(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r4589(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r458(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r45(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_path_r4589(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_path_r45(sprom, prefix, fallback);
 		break;
 	case 8:
-		bcm47xx_fill_sprom_r1234589(sprom, prefix);
-		bcm47xx_fill_sprom_r12389(sprom, prefix);
-		bcm47xx_fill_sprom_r2389(sprom, prefix);
-		bcm47xx_fill_sprom_r389(sprom, prefix);
-		bcm47xx_fill_sprom_r4589(sprom, prefix);
-		bcm47xx_fill_sprom_r458(sprom, prefix);
-		bcm47xx_fill_sprom_r89(sprom, prefix);
-		bcm47xx_fill_sprom_path_r4589(sprom, prefix);
+		bcm47xx_fill_sprom_r1234589(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r12389(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r2389(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r389(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r4589(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r458(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r89(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_path_r4589(sprom, prefix, fallback);
 		break;
 	case 9:
-		bcm47xx_fill_sprom_r1234589(sprom, prefix);
-		bcm47xx_fill_sprom_r12389(sprom, prefix);
-		bcm47xx_fill_sprom_r2389(sprom, prefix);
-		bcm47xx_fill_sprom_r389(sprom, prefix);
-		bcm47xx_fill_sprom_r4589(sprom, prefix);
-		bcm47xx_fill_sprom_r89(sprom, prefix);
-		bcm47xx_fill_sprom_r9(sprom, prefix);
-		bcm47xx_fill_sprom_path_r4589(sprom, prefix);
+		bcm47xx_fill_sprom_r1234589(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r12389(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r2389(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r389(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r4589(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r89(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r9(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_path_r4589(sprom, prefix, fallback);
 		break;
 	default:
 		pr_warn("Unsupported SPROM revision %d detected. Will extract"
 			" v1\n", sprom->revision);
 		sprom->revision = 1;
-		bcm47xx_fill_sprom_r1234589(sprom, prefix);
-		bcm47xx_fill_sprom_r12389(sprom, prefix);
-		bcm47xx_fill_sprom_r1(sprom, prefix);
+		bcm47xx_fill_sprom_r1234589(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r12389(sprom, prefix, fallback);
+		bcm47xx_fill_sprom_r1(sprom, prefix, fallback);
 	}
 }
 
@@ -617,11 +733,12 @@ void bcm47xx_fill_sprom(struct ssb_sprom *sprom, const char *prefix)
 void bcm47xx_fill_ssb_boardinfo(struct ssb_boardinfo *boardinfo,
 				const char *prefix)
 {
-	nvram_read_u16(prefix, NULL, "boardvendor", &boardinfo->vendor, 0);
+	nvram_read_u16(prefix, NULL, "boardvendor", &boardinfo->vendor, 0,
+		       true);
 	if (!boardinfo->vendor)
 		boardinfo->vendor = SSB_BOARDVENDOR_BCM;
 
-	nvram_read_u16(prefix, NULL, "boardtype", &boardinfo->type, 0);
+	nvram_read_u16(prefix, NULL, "boardtype", &boardinfo->type, 0, true);
 }
 #endif
 
@@ -629,10 +746,11 @@ void bcm47xx_fill_ssb_boardinfo(struct ssb_boardinfo *boardinfo,
 void bcm47xx_fill_bcma_boardinfo(struct bcma_boardinfo *boardinfo,
 				 const char *prefix)
 {
-	nvram_read_u16(prefix, NULL, "boardvendor", &boardinfo->vendor, 0);
+	nvram_read_u16(prefix, NULL, "boardvendor", &boardinfo->vendor, 0,
+		       true);
 	if (!boardinfo->vendor)
 		boardinfo->vendor = SSB_BOARDVENDOR_BCM;
 
-	nvram_read_u16(prefix, NULL, "boardtype", &boardinfo->type, 0);
+	nvram_read_u16(prefix, NULL, "boardtype", &boardinfo->type, 0, true);
 }
 #endif
diff --git a/arch/mips/include/asm/mach-bcm47xx/bcm47xx.h b/arch/mips/include/asm/mach-bcm47xx/bcm47xx.h
index 26fdaf40b930..cc7563ba1cbf 100644
--- a/arch/mips/include/asm/mach-bcm47xx/bcm47xx.h
+++ b/arch/mips/include/asm/mach-bcm47xx/bcm47xx.h
@@ -44,8 +44,8 @@ union bcm47xx_bus {
 extern union bcm47xx_bus bcm47xx_bus;
 extern enum bcm47xx_bus_type bcm47xx_bus_type;
 
-void bcm47xx_fill_sprom(struct ssb_sprom *sprom, const char *prefix);
-void bcm47xx_fill_sprom_ethernet(struct ssb_sprom *sprom, const char *prefix);
+void bcm47xx_fill_sprom(struct ssb_sprom *sprom, const char *prefix,
+			bool fallback);
 
 #ifdef CONFIG_BCM47XX_SSB
 void bcm47xx_fill_ssb_boardinfo(struct ssb_boardinfo *boardinfo,