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Commit 54ebae71 authored by Robin Getz's avatar Robin Getz Committed by Mike Frysinger
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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: default avatarRobin Getz <robin.getz@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
parent 86f2008b

arch/blackfin/kernel/early_printk.c

+6 −2
Original line number Diff line number Diff line
@@ -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();