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cfi-flash: Add CFG_FLASH_AUTOPROTECT_LIST

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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>
This commit is contained in:
Matthias Fuchs 2008-04-18 16:29:40 +02:00 committed by Stefan Roese
parent d0d91ae3ac
commit c63ad6325a
1 changed files with 17 additions and 0 deletions
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17
drivers/mtd/cfi_flash.c
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@ -1873,6 +1873,12 @@ unsigned long flash_init (void)
{
unsigned long size = 0;
int i;
#if defined(CFG_FLASH_AUTOPROTECT_LIST)
struct apl_s {
ulong start;
ulong size;
} apl[] = CFG_FLASH_AUTOPROTECT_LIST;
#endif
#ifdef CFG_FLASH_PROTECTION
char *s = getenv("unlock");
@ -1966,6 +1972,17 @@ unsigned long flash_init (void)
CFG_ENV_ADDR_REDUND + CFG_ENV_SIZE_REDUND - 1,
flash_get_info(CFG_ENV_ADDR_REDUND));
#endif
#if defined(CFG_FLASH_AUTOPROTECT_LIST)
for (i = 0; i < (sizeof(apl) / sizeof(struct apl_s)); 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));
}
#endif
return (size);
}