This patch adds a configurable flash auto protection list that can be used to make U-Boot protect flash regions in flash_init().
The idea has been discussed on the u-boot mailing list starting on Nov 18th, 2007.
Even this patch brings a new feature it is used as a bugfix for 4xx platforms where flash_init() does not completely protect the monitor's flash range in all situations.
U-Boot protects the flash range from CFG_MONITOR_BASE to (CFG_MONITOR_BASE + monitor_flash_len - 1) by default. This does not include the reset vector at 0xfffffffc.
Example: #define CFG_FLASH_AUTOPROTECT_LIST {{0xfff80000, 0x80000}}
This config option will auto protect the last 512k of flash that contains the bootloader on board like APC405 and PMC405.
Signed-off-by: Matthias Fuchs matthias.fuchs@esd-electronics.com --- drivers/mtd/cfi_flash.c | 21 +++++++++++++++++++++ 1 files changed, 21 insertions(+), 0 deletions(-)
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c index e3cfb8a..fad9e8b 100644 --- a/drivers/mtd/cfi_flash.c +++ b/drivers/mtd/cfi_flash.c @@ -169,6 +169,17 @@ flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* FLASH chips info */ #define CFG_FLASH_CFI_WIDTH FLASH_CFI_8BIT #endif
+struct apl_s { + ulong start; + ulong size; +}; + +#if !defined(CFG_FLASH_AUTOPROTECT_LIST) +struct apl_s apl[] = {}; +#else +struct apl_s apl[] = CFG_FLASH_AUTOPROTECT_LIST; +#endif + typedef unsigned long flash_sect_t;
/* CFI standard query structure */ @@ -1966,6 +1977,16 @@ unsigned long flash_init (void) CFG_ENV_ADDR_REDUND + CFG_ENV_SIZE_REDUND - 1, flash_get_info(CFG_ENV_ADDR_REDUND)); #endif + + for (i = 0; i < ARRAY_SIZE(apl); i++) { + debug ("autoprotecting from %08x to %08x\n", + apl[i].start, apl[i].start + apl[i].size - 1); + flash_protect (FLAG_PROTECT_SET, + apl[i].start, + apl[i].start + apl[i].size - 1, + flash_get_info (apl[i].start)); + } + return (size); }