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cfi_flash: Fix problems with status/id read mode

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This patch adds some calls to set the flash chip in the read-status-
register- or read-id-mode before the corresponding register is
read back. This problem was detected while porting the common CFI
driver to support the Xilinx DS617 flash chips.

Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Stefan Roese 2010-10-25 18:31:29 +02:00
parent 97a85b223a
commit df4e813b72
1 changed files with 12 additions and 0 deletions
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12
drivers/mtd/cfi_flash.c
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@ -1426,6 +1426,11 @@ int flash_real_protect (flash_info_t * info, long sector, int prot)
#endif
};
/*
* Flash needs to be in status register read mode for
* flash_full_status_check() to work correctly
*/
flash_write_cmd(info, sector, 0, FLASH_CMD_READ_STATUS);
if ((retcode =
flash_full_status_check (info, sector, info->erase_blk_tout,
prot ? "protect" : "unprotect")) == 0) {
@ -1975,6 +1980,13 @@ ulong flash_get_size (phys_addr_t base, int banknum)
case CFI_CMDSET_INTEL_PROG_REGIONS:
case CFI_CMDSET_INTEL_EXTENDED:
case CFI_CMDSET_INTEL_STANDARD:
/*
* Set flash to read-id mode. Otherwise
* reading protected status is not
* guaranteed.
*/
flash_write_cmd(info, sect_cnt, 0,
FLASH_CMD_READ_ID);
info->protect[sect_cnt] =
flash_isset (info, sect_cnt,
FLASH_OFFSET_PROTECT,