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| author | Stefan Roese <sr@denx.de> | 2010-10-25 18:31:29 +0200 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2010-12-17 09:54:03 +0100 |
| commit | df4e813b72bf07d9026b00455f5e7dffd694ae48 (patch) | |
| tree | ac88addeb444ab1dd34263f36ab07eba597aa2d6 /drivers/mtd | |
| parent | 97a85b223ab316d11f3a374fecc5d449a1c8a694 (diff) | |
| download | blackbird-obmc-uboot-df4e813b72bf07d9026b00455f5e7dffd694ae48.tar.gz blackbird-obmc-uboot-df4e813b72bf07d9026b00455f5e7dffd694ae48.zip | |
cfi_flash: Fix problems with status/id read mode
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>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/cfi_flash.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c index 39c235ebc2..643cd87731 100644 --- a/drivers/mtd/cfi_flash.c +++ b/drivers/mtd/cfi_flash.c @@ -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, |
