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authorMike Frysinger <vapier@gentoo.org>2008-10-11 21:44:00 -0400
committerMike Frysinger <vapier@gentoo.org>2009-01-28 13:26:15 -0500
commitb1e9435b643043dd8fbd1fcc47309c6acb7b3c8e (patch)
treeb21c55b7e58b3460c6027c04bccc2b7d6ea62443
parentb5eba3fafcccd1979380f12a256bd0e19be3d61e (diff)
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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>
-rw-r--r--cpu/blackfin/cpu.c6
-rw-r--r--lib_blackfin/boot.c9
2 files changed, 14 insertions, 1 deletions
diff --git a/cpu/blackfin/cpu.c b/cpu/blackfin/cpu.c
index 9efd88e..30c214b 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);
diff --git a/lib_blackfin/boot.c b/lib_blackfin/boot.c
index 47e27de..537be2b 100644
--- a/lib_blackfin/boot.c
+++ b/lib_blackfin/boot.c
@@ -31,6 +31,8 @@ static char *make_command_line(void)
return dest;
}
+extern ulong bfin_poweron_retx;
+
int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
{
int (*appl) (char *cmdline);
@@ -49,7 +51,12 @@ int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
cmdline = make_command_line();
icache_disable();
dcache_disable();
- (*appl) (cmdline);
+ asm __volatile__(
+ "RETX = %[retx];"
+ "CALL (%0);"
+ :
+ : "p"(appl), "q0"(cmdline), [retx] "d"(bfin_poweron_retx)
+ );
/* does not return */
return 1;