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Blackfin: catch hardware errors earlier during booting

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Allow hardware errors to be caught during early portions of booting, and
leave something in the shadow console that people can use to debug their
system with (to be printed out by the bootloader on next reset).

This enables the hardare error interrupts in head.S, allowing us to find
hardware errors when they happen (well, as much as you can with a hardware
error) and prints out the trace if it is enabled.  This will catch errors
(like booting the wrong image on a 533) which previously resulted in a
infinite loop/hang, as well as random hardware errors before before
setup_arch().

To disable this debug only feature - turn off EARLY_PRINTK.

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Robin Getz
2009-07-07 20:17:09 +00:00
committed by Mike Frysinger
parent 3f871feaf3
commit 837ec2d56c
7 changed files with 158 additions and 12 deletions
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11
arch/blackfin/mach-common/head.S
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@@ -153,6 +153,8 @@ ENTRY(__start)
#ifdef CONFIG_EARLY_PRINTK
call _init_early_exception_vectors;
r0 = (EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU);
sti r0;
#endif
r0 = 0 (x);
@@ -212,12 +214,21 @@ ENTRY(__start)
[p0] = p1;
csync;
#ifdef CONFIG_EARLY_PRINTK
r0 = (EVT_IVG15 | EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU) (z);
#else
r0 = EVT_IVG15 (z);
#endif
sti r0;
raise 15;
#ifdef CONFIG_EARLY_PRINTK
p0.l = _early_trap;
p0.h = _early_trap;
#else
p0.l = .LWAIT_HERE;
p0.h = .LWAIT_HERE;
#endif
reti = p0;
#if ANOMALY_05000281
nop; nop; nop;