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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>
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1 changed files with 6 additions and 2 deletions
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@ -202,11 +202,15 @@ asmlinkage void __init init_early_exception_vectors(void)
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asmlinkage void __init early_trap_c(struct pt_regs *fp, void *retaddr)
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{
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/* This can happen before the uart is initialized, so initialize
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* the UART now
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* the UART now (but only if we are running on the processor we think
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* we are compiled for - otherwise we write to MMRs that don't exist,
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* and cause other problems. Nothing comes out the UART, but it does
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* end up in the __buf_log.
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*/
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if (likely(early_console == NULL))
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if (likely(early_console == NULL) && CPUID == bfin_cpuid())
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setup_early_printk(DEFAULT_EARLY_PORT);
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printk(KERN_EMERG "Early panic\n");
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dump_bfin_mem(fp);
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show_regs(fp);
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dump_bfin_trace_buffer();
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