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>

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;