From b1e9435b643043dd8fbd1fcc47309c6acb7b3c8e Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gentoo.org>
Date: Sat, 11 Oct 2008 21:44:00 -0400
Subject: Blackfin: pass RETX to Linux

Make sure we save the value of RETX at power on and then pass it on to the
kernel so that it can nicely debug a "double-fault-caused-a-reset" crash.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
 cpu/blackfin/cpu.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'cpu/blackfin')

diff --git a/cpu/blackfin/cpu.c b/cpu/blackfin/cpu.c
index 9efd88e7e..30c214be7 100644
--- a/cpu/blackfin/cpu.c
+++ b/cpu/blackfin/cpu.c
@@ -14,11 +14,14 @@
 #include <asm/blackfin.h>
 #include <asm/cplb.h>
 #include <asm/mach-common/bits/core.h>
+#include <asm/mach-common/bits/ebiu.h>
 #include <asm/mach-common/bits/trace.h>
 
 #include "cpu.h"
 #include "serial.h"
 
+ulong bfin_poweron_retx;
+
 __attribute__ ((__noreturn__))
 void cpu_init_f(ulong bootflag, ulong loaded_from_ldr)
 {
@@ -48,6 +51,9 @@ void cpu_init_f(ulong bootflag, ulong loaded_from_ldr)
 		bfin_write_EBIU_AMGCTL(CONFIG_EBIU_AMGCTL_VAL);
 #endif
 
+	/* Save RETX so we can pass it while booting Linux */
+	bfin_poweron_retx = bootflag;
+
 #ifdef CONFIG_DEBUG_DUMP
 	/* Turn on hardware trace buffer */
 	bfin_write_TBUFCTL(TBUFPWR | TBUFEN);
-- 
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