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authorMike Frysinger <vapier@gentoo.org>2008-01-29 18:21:05 -0500
committerWolfgang Denk <wd@denx.de>2008-04-13 13:53:45 -0700
commit1f1d88dd40815332df32982e739f2ddd2da6fe1a (patch)
tree84880cf65619d0b5d195804d73c1f7ba2739fe23
parente6dfed705efa44ebf00d21bb1588c6ccc8f3ad32 (diff)
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disable caches before booting an app for Blackfin apps
It isn't generally save to execute applications outside of U-Boot with caches enabled due to the way the Blackfin processor handles caches (requires software assistance). This patch disables caches before booting an ELF or just booting raw code. The previous discussion on the patch was that we wanted to use weaks instead, but that proved to not be feasible when multiple symbols are involved, which puts us back at the ifdef solution. I've minimized the ugliness by moving the setup step outside of the main function. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
-rw-r--r--common/cmd_boot.c40
-rw-r--r--common/cmd_elf.c22
2 files changed, 42 insertions, 20 deletions
diff --git a/common/cmd_boot.c b/common/cmd_boot.c
index e68f16f..9d4f026 100644
--- a/common/cmd_boot.c
+++ b/common/cmd_boot.c
@@ -32,6 +32,23 @@
DECLARE_GLOBAL_DATA_PTR;
#endif
+static inline void go_setup(int argc, char *argv[])
+{
+#if defined(CONFIG_I386)
+ /*
+ * x86 does not use a dedicated register to pass the pointer
+ * to the global_data
+ */
+ argv[0] = (char *)gd;
+
+#elif defined(CONFIG_BLACKFIN)
+ if (dcache_status ())
+ dcache_disable ();
+ if (icache_status ())
+ icache_disable ();
+#endif
+}
+
int do_go (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
ulong addr, rc;
@@ -46,25 +63,20 @@ int do_go (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
printf ("## Starting application at 0x%08lX ...\n", addr);
+ go_setup(argc, argv);
+
+#if defined(CONFIG_NIOS)
/*
- * pass address parameter as argv[0] (aka command name),
- * and all remaining args
- */
-#if defined(CONFIG_I386)
- /*
- * x86 does not use a dedicated register to pass the pointer
- * to the global_data
+ * Nios function pointers are address >> 1
*/
- argv[0] = (char *)gd;
+ addr >>= 1;
#endif
-#if !defined(CONFIG_NIOS)
- rc = ((ulong (*)(int, char *[]))addr) (--argc, &argv[1]);
-#else
+
/*
- * Nios function pointers are address >> 1
+ * pass address parameter as argv[0] (aka command name),
+ * and all remaining args
*/
- rc = ((ulong (*)(int, char *[]))(addr>>1)) (--argc, &argv[1]);
-#endif
+ rc = ((ulong (*)(int, char *[]))addr) (--argc, &argv[1]);
if (rc != 0) rcode = 1;
printf ("## Application terminated, rc = 0x%lX\n", rc);
diff --git a/common/cmd_elf.c b/common/cmd_elf.c
index 2eb7453..4683554 100644
--- a/common/cmd_elf.c
+++ b/common/cmd_elf.c
@@ -27,6 +27,21 @@ DECLARE_GLOBAL_DATA_PTR;
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#endif
+static inline void bootelf_setup(int argc, char *argv[])
+{
+ /*
+ * QNX images require the data cache is disabled.
+ * Data cache is already flushed, so just turn it off.
+ */
+ if (dcache_status ())
+ dcache_disable ();
+
+#ifdef CONFIG_BLACKFIN
+ if (icache_status ())
+ icache_disable ();
+#endif
+}
+
int valid_elf_image (unsigned long addr);
unsigned long load_elf_image (unsigned long addr);
@@ -53,12 +68,7 @@ int do_bootelf (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
printf ("## Starting application at 0x%08lx ...\n", addr);
- /*
- * QNX images require the data cache is disabled.
- * Data cache is already flushed, so just turn it off.
- */
- if (dcache_status ())
- dcache_disable ();
+ bootelf_setup(argc, argv);
/*
* pass address parameter as argv[0] (aka command name),