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 thomas@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; }