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authorPaul Kocialkowski <contact@paulk.fr>2015-07-15 16:02:23 +0200
committerTom Rini <trini@konsulko.com>2015-07-27 15:02:06 -0400
commited19bdaea3d70331de3cd93d0b21970fead97d39 (patch)
tree35c4a7ac106a63ff240ebcadb898733402eeb472 /arch/arm/cpu/armv7/omap-common/boot-common.c
parent2cb81b6bcd446952e83ef65279d01c3933ba0baa (diff)
downloadblackbird-obmc-uboot-ed19bdaea3d70331de3cd93d0b21970fead97d39.tar.gz
blackbird-obmc-uboot-ed19bdaea3d70331de3cd93d0b21970fead97d39.zip
omap-common: SYS_BOOT-based fallback boot device selection for peripheral boot
OMAP devices might boot from peripheral devices, such as UART or USB. When that happens, the U-Boot SPL tries to boot the next stage (complete U-Boot) from that peripheral device, but in most cases, this is not a valid boot device. This introduces a fallback option that reads the SYS_BOOT pins, that are used by the bootrom to determine which device to boot from. It is intended for the SYS_BOOT value to be interpreted in the memory-preferred scheme, so that the U-Boot SPL can load the next stage from a valid location. Practically, this options allows loading the U-Boot SPL through USB and have it load the next stage according to the memory device selected by SYS_BOOT instead of stalling. Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Diffstat (limited to 'arch/arm/cpu/armv7/omap-common/boot-common.c')
-rw-r--r--arch/arm/cpu/armv7/omap-common/boot-common.c52
1 files changed, 45 insertions, 7 deletions
diff --git a/arch/arm/cpu/armv7/omap-common/boot-common.c b/arch/arm/cpu/armv7/omap-common/boot-common.c
index f2a25dcdc9..5ec46fa14d 100644
--- a/arch/arm/cpu/armv7/omap-common/boot-common.c
+++ b/arch/arm/cpu/armv7/omap-common/boot-common.c
@@ -21,6 +21,11 @@
DECLARE_GLOBAL_DATA_PTR;
+__weak u32 omap_sys_boot_device(void)
+{
+ return BOOT_DEVICE_NONE;
+}
+
void save_omap_boot_params(void)
{
u32 boot_params = *((u32 *)OMAP_SRAM_SCRATCH_BOOT_PARAMS);
@@ -34,9 +39,10 @@ void save_omap_boot_params(void)
omap_boot_params = (struct omap_boot_parameters *)boot_params;
- /* Boot device */
-
boot_device = omap_boot_params->boot_device;
+ boot_mode = MMCSD_MODE_UNDEFINED;
+
+ /* Boot device */
#ifdef BOOT_DEVICE_NAND_I2C
/*
@@ -58,16 +64,39 @@ void save_omap_boot_params(void)
if (boot_device == BOOT_DEVICE_QSPI_4)
boot_device = BOOT_DEVICE_SPI;
#endif
+#if (defined(BOOT_DEVICE_UART) && !defined(CONFIG_SPL_YMODEM_SUPPORT)) || \
+ (defined(BOOT_DEVICE_USB) && !defined(CONFIG_SPL_USB_SUPPORT)) || \
+ (defined(BOOT_DEVICE_USBETH) && !defined(CONFIG_SPL_USBETH_SUPPORT))
+ /*
+ * When booting from peripheral booting, the boot device is not usable
+ * as-is (unless there is support for it), so the boot device is instead
+ * figured out using the SYS_BOOT pins.
+ */
+ switch (boot_device) {
+#ifdef BOOT_DEVICE_UART
+ case BOOT_DEVICE_UART:
+#endif
+#ifdef BOOT_DEVICE_USB
+ case BOOT_DEVICE_USB:
+#endif
+ boot_device = omap_sys_boot_device();
+
+ /* MMC raw mode will fallback to FS mode. */
+ if ((boot_device >= MMC_BOOT_DEVICES_START) &&
+ (boot_device <= MMC_BOOT_DEVICES_END))
+ boot_mode = MMCSD_MODE_RAW;
+
+ break;
+ }
+#endif
gd->arch.omap_boot_device = boot_device;
/* Boot mode */
- boot_mode = MMCSD_MODE_UNDEFINED;
-
+#ifdef CONFIG_OMAP34XX
if ((boot_device >= MMC_BOOT_DEVICES_START) &&
(boot_device <= MMC_BOOT_DEVICES_END)) {
-#ifdef CONFIG_OMAP34XX
switch (boot_device) {
case BOOT_DEVICE_MMC1:
boot_mode = MMCSD_MODE_FS;
@@ -76,7 +105,16 @@ void save_omap_boot_params(void)
boot_mode = MMCSD_MODE_RAW;
break;
}
+ }
#else
+ /*
+ * If the boot device was dynamically changed and doesn't match what
+ * the bootrom initially booted, we cannot use the boot device
+ * descriptor to figure out the boot mode.
+ */
+ if ((boot_device == omap_boot_params->boot_device) &&
+ (boot_device >= MMC_BOOT_DEVICES_START) &&
+ (boot_device <= MMC_BOOT_DEVICES_END)) {
boot_params = omap_boot_params->boot_device_descriptor;
if ((boot_params < NON_SECURE_SRAM_START) ||
(boot_params > NON_SECURE_SRAM_END))
@@ -92,12 +130,12 @@ void save_omap_boot_params(void)
if (boot_mode != MMCSD_MODE_FS &&
boot_mode != MMCSD_MODE_RAW)
#ifdef CONFIG_SUPPORT_EMMC_BOOT
- boot_mode = MMCSD_MODE_EMMCBOOT
+ boot_mode = MMCSD_MODE_EMMCBOOT;
#else
boot_mode = MMCSD_MODE_UNDEFINED;
#endif
-#endif
}
+#endif
gd->arch.omap_boot_mode = boot_mode;
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