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| author | Mike Frysinger <vapier@gentoo.org> | 2008-10-11 21:44:00 -0400 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2009-01-28 13:26:15 -0500 |
| commit | b1e9435b643043dd8fbd1fcc47309c6acb7b3c8e (patch) | |
| tree | b21c55b7e58b3460c6027c04bccc2b7d6ea62443 | |
| parent | b5eba3fafcccd1979380f12a256bd0e19be3d61e (diff) | |
| download | u-boot-midas-b1e9435b643043dd8fbd1fcc47309c6acb7b3c8e.tar.gz u-boot-midas-b1e9435b643043dd8fbd1fcc47309c6acb7b3c8e.tar.bz2 u-boot-midas-b1e9435b643043dd8fbd1fcc47309c6acb7b3c8e.zip | |
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.c | 6 | ||||
| -rw-r--r-- | lib_blackfin/boot.c | 9 |
2 files changed, 14 insertions, 1 deletions
diff --git a/cpu/blackfin/cpu.c b/cpu/blackfin/cpu.c index 9efd88e7ec..30c214be7b 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 47e27de305..537be2bd1e 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; |