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>

arch/blackfin/mm/init.c

@@ -33,6 +33,7 @@
 #include <asm/bfin-global.h>
 #include <asm/pda.h>
 #include <asm/cplbinit.h>
+#include <asm/early_printk.h>
 #include "blackfin_sram.h"
 
 /*
@@ -113,6 +114,8 @@ asmlinkage void __init init_pda(void)
 {
 	unsigned int cpu = raw_smp_processor_id();
 
+	early_shadow_stamp();
+
 	/* Initialize the PDA fields holding references to other parts
 	   of the memory. The content of such memory is still
 	   undefined at the time of the call, we are only setting up