Flash might be in unknown state when u-boot is started with jtag.
And got wrong env data. So reset it in board early init.
We cannot use generic cfi flash routines, because flash_init() is
not run yet.
Signed-off-by: Thomas Chou <tho...@wytron.com.tw>
---
v2 use weak func to reset flash, as Wolfgang suggested.
reset the chip where env is located.
board/altera/nios2-generic/nios2-generic.c | 16 ++++++++++++++++
1 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/board/altera/nios2-generic/nios2-generic.c
b/board/altera/nios2-generic/nios2-generic.c
index 89848cf..220a4c4 100644
--- a/board/altera/nios2-generic/nios2-generic.c
+++ b/board/altera/nios2-generic/nios2-generic.c
@@ -24,12 +24,28 @@
#include <common.h>
#include <netdev.h>
+#include <mtd/cfi_flash.h>
+#include <asm/io.h>
void text_base_hook(void); /* nop hook for text_base.S */
+#if defined(CONFIG_ENV_IS_IN_FLASH) && defined(CONFIG_ENV_ADDR)
+static void __early_flash_cmd_reset(void)
+{
+ /* reset flash before we read env */
+ writeb(AMD_CMD_RESET, CONFIG_ENV_ADDR);
+ writeb(FLASH_CMD_RESET, CONFIG_ENV_ADDR);
+}
+void early_flash_cmd_reset(void)
+ __attribute__((weak,alias("__early_flash_cmd_reset")));
+#endif
+
int board_early_init_f(void)
{
text_base_hook();
+#if defined(CONFIG_ENV_IS_IN_FLASH) && defined(CONFIG_ENV_ADDR)
+ early_flash_cmd_reset();
+#endif
return 0;
}
--
1.7.3.4
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