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| author | Robin Getz <robin.getz@analog.com> | 2009-07-07 20:17:09 +0000 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2009-09-16 21:31:44 -0400 |
| commit | 837ec2d56c41640d1f1238e52c350b2a516d29ba (patch) | |
| tree | 1732468388385c411853c67cb2b288c2f8d17cc7 /arch/blackfin/mach-common/head.S | |
| parent | 3f871feaf3390c6d6e578818f867917c2e4738a2 (diff) | |
| download | linux-837ec2d56c41640d1f1238e52c350b2a516d29ba.tar.gz linux-837ec2d56c41640d1f1238e52c350b2a516d29ba.tar.bz2 linux-837ec2d56c41640d1f1238e52c350b2a516d29ba.zip | |
Blackfin: catch hardware errors earlier during booting
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>
Diffstat (limited to 'arch/blackfin/mach-common/head.S')
| -rw-r--r-- | arch/blackfin/mach-common/head.S | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/blackfin/mach-common/head.S b/arch/blackfin/mach-common/head.S index f826f6b9f917..66910121fa6f 100644 --- a/arch/blackfin/mach-common/head.S +++ b/arch/blackfin/mach-common/head.S @@ -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; |