Title: [6621] trunk/arch/blackfin/kernel/early_printk.c: Before we configure the UART, check to make sure we are running on the
- Revision
- 6621
- Author
- rgetz
- Date
- 2009-06-10 01:11:21 -0500 (Wed, 10 Jun 2009)
Log Message
Before we configure the UART, check to make sure we are running on the
expected processor - otherwise, we cause problems by configuring pins
that don't exist (and causing an infinite loop of faults).
Modified Paths
Diff
Modified: trunk/arch/blackfin/kernel/early_printk.c (6620 => 6621)
--- trunk/arch/blackfin/kernel/early_printk.c 2009-06-09 18:40:12 UTC (rev 6620)
+++ trunk/arch/blackfin/kernel/early_printk.c 2009-06-10 06:11:21 UTC (rev 6621)
@@ -202,11 +202,15 @@
asmlinkage void __init early_trap_c(struct pt_regs *fp, void *retaddr)
{
/* This can happen before the uart is initialized, so initialize
- * the UART now
+ * the UART now (but only if we are running on the processor we think
+ * we are compiled for - otherwise we write to MMRs that don't exist,
+ * and cause other problems. Nothing comes out the UART, but it does
+ * end up in the __buf_log.
*/
- if (likely(early_console == NULL))
+ if (likely(early_console == NULL) && CPUID == bfin_cpuid())
setup_early_printk(DEFAULT_EARLY_PORT);
+ printk(KERN_EMERG "Early panic\n");
dump_bfin_mem(fp);
show_regs(fp);
dump_bfin_trace_buffer();
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