aboutsummaryrefslogtreecommitdiffstats
path: root/arch/blackfin/mach-common/head.S
diff options
context:
space:
mode:
authorRobin Getz <robin.getz@analog.com>2009-07-07 20:17:09 +0000
committerMike Frysinger <vapier@gentoo.org>2009-09-16 21:31:44 -0400
commit837ec2d56c41640d1f1238e52c350b2a516d29ba (patch)
tree1732468388385c411853c67cb2b288c2f8d17cc7 /arch/blackfin/mach-common/head.S
parent3f871feaf3390c6d6e578818f867917c2e4738a2 (diff)
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.S11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/blackfin/mach-common/head.S b/arch/blackfin/mach-common/head.S
index f826f6b9f91..66910121fa6 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;