Messages in this thread Patch in this message | | | From | Mike Frysinger <> | Subject | [PATCH 11/27] Blackfin: do not configure the UART early if on wrong processor | Date | Fri, 12 Jun 2009 12:24:29 -0400 |
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From: Robin Getz <robin.getz@analog.com>
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 <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> --- arch/blackfin/kernel/early_printk.c | 8 ++++++-- 1 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/arch/blackfin/kernel/early_printk.c b/arch/blackfin/kernel/early_printk.c index 3302719..2ab5681 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(); -- 1.6.3.1
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