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| author | Robin Getz <robin.getz@analog.com> | 2009-06-10 06:11:21 +0000 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2009-06-13 07:20:10 -0400 |
| commit | 54ebae7166275a618f0228138e67ff7d10a3b9d0 (patch) | |
| tree | 403fc7decea11e2e15367b241a22c5f071a925c2 /arch/blackfin/kernel/early_printk.c | |
| parent | 86f2008bf546af9a434f480710e8d33891616bf5 (diff) | |
| download | linux-54ebae7166275a618f0228138e67ff7d10a3b9d0.tar.gz linux-54ebae7166275a618f0228138e67ff7d10a3b9d0.tar.bz2 linux-54ebae7166275a618f0228138e67ff7d10a3b9d0.zip | |
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 <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin/kernel/early_printk.c')
| -rw-r--r-- | 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 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(); |