Blackfin: fix early crash when booting on wrong cpu

Make sure we process the kernel command line before poking the hardware,
so that we can process early printk.  This helps ensure that if you boot
a kernel configured for a different processor, something will be left in
the log buffer.

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 15 insertions, 8 deletions

diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index 8d7892820130..298f023bcc09 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -477,9 +477,11 @@ static __init void parse_cmdline_early(char *cmdline_p)
 			} else if (!memcmp(to, "clkin_hz=", 9)) {
 				to += 9;
 				early_init_clkin_hz(to);
+#ifdef CONFIG_EARLY_PRINTK
 			} else if (!memcmp(to, "earlyprintk=", 12)) {
 				to += 12;
 				setup_early_printk(to);
+#endif
 			} else if (!memcmp(to, "memmap=", 7)) {
 				to += 7;
 				parse_memmap(to);
@@ -798,6 +800,11 @@ void __init setup_arch(char **cmdline_p)
 {
 	unsigned long sclk, cclk;
 
+	/* Check to make sure we are running on the right processor */
+	if (unlikely(CPUID != bfin_cpuid()))
+		printk(KERN_ERR "ERROR: Not running on ADSP-%s: unknown CPUID 0x%04x Rev 0.%d\n",
+			CPU, bfin_cpuid(), bfin_revid());
+
 #ifdef CONFIG_DUMMY_CONSOLE
 	conswitchp = &dummy_con;
 #endif
@@ -812,14 +819,17 @@ void __init setup_arch(char **cmdline_p)
 	memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 	boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
 
-	/* setup memory defaults from the user config */
-	physical_mem_end = 0;
-	_ramend = get_mem_size() * 1024 * 1024;
-
 	memset(&bfin_memmap, 0, sizeof(bfin_memmap));
 
+	/* If the user does not specify things on the command line, use
+	 * what the bootloader set things up as
+	 */
+	physical_mem_end = 0;
 	parse_cmdline_early(&command_line[0]);
 
+	if (_ramend == 0)
+		_ramend = get_mem_size() * 1024 * 1024;
+
 	if (physical_mem_end == 0)
 		physical_mem_end = _ramend;
 
@@ -910,10 +920,7 @@ void __init setup_arch(char **cmdline_p)
 	else
 		printk(KERN_INFO "Compiled for ADSP-%s Rev 0.%d\n", CPU, bfin_compiled_revid());
 
-	if (unlikely(CPUID != bfin_cpuid()))
-		printk(KERN_ERR "ERROR: Not running on ADSP-%s: unknown CPUID 0x%04x Rev 0.%d\n",
-			CPU, bfin_cpuid(), bfin_revid());
-	else {
+	if (likely(CPUID == bfin_cpuid())) {
 		if (bfin_revid() != bfin_compiled_revid()) {
 			if (bfin_compiled_revid() == -1)
 				printk(KERN_ERR "Warning: Compiled for Rev none, but running on Rev %d\n",