From 54ebae7166275a618f0228138e67ff7d10a3b9d0 Mon Sep 17 00:00:00 2001 From: Robin Getz Date: Wed, 10 Jun 2009 06:11:21 +0000 Subject: Blackfin: do not configure the UART early if on wrong processor Before we configure the early 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). Signed-off-by: Robin Getz Signed-off-by: Mike Frysinger --- arch/blackfin/kernel/early_printk.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/blackfin/kernel/early_printk.c b/arch/blackfin/kernel/early_printk.c index 3302719173ca..2ab56811841c 100644 --- a/arch/blackfin/kernel/early_printk.c +++ b/arch/blackfin/kernel/early_printk.c @@ -202,11 +202,15 @@ asmlinkage void __init init_early_exception_vectors(void) 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(); -- cgit v1.2.1