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cfi: Check for blank before erase 

Added an optional check in the CFI driver to evaluate if the sector is
already blank before issuing an erase command.  Improves erase time by
over a factor of 10 if already blank.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Joe Hershberger 2012-08-17 15:36:40 -05:00 committed by Stefan Roese
parent a005f19eff
commit 6822a647b9
1 changed files with 26 additions and 0 deletions
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26
drivers/mtd/cfi_flash.c
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@ -1078,6 +1078,32 @@ int flash_erase (flash_info_t * info, int s_first, int s_last)
for (sect = s_first; sect <= s_last; sect++) {
if (info->protect[sect] == 0) { /* not protected */
#ifdef CONFIG_SYS_FLASH_CHECK_BLANK_BEFORE_ERASE
int k;
int size;
int erased;
u32 *flash;
/*
* Check if whole sector is erased
*/
size = flash_sector_size(info, sect);
erased = 1;
flash = (u32 *)info->start[sect];
/* divide by 4 for longword access */
size = size >> 2;
for (k = 0; k < size; k++) {
if (flash_read32(flash++) != 0xffffffff) {
erased = 0;
break;
}
}
if (erased) {
if (flash_verbose)
putc(',');
continue;
}
#endif
switch (info->vendor) {
case CFI_CMDSET_INTEL_PROG_REGIONS:
case CFI_CMDSET_INTEL_STANDARD: