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| author | Jagannadha Sutradharudu Teki <jagannadha.sutradharudu-teki@xilinx.com> | 2013-03-01 16:54:26 +0530 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2013-04-02 14:27:54 +0200 |
| commit | c502321c4a1bc8d859ecf19b22f9d0ce03954fd6 (patch) | |
| tree | 60a9af431831e0bf7add56cf280b905a0daf07e2 | |
| parent | 239cb9d904cfa8ab50d840a47b3306189d695c75 (diff) | |
| download | u-boot-imx-c502321c4a1bc8d859ecf19b22f9d0ce03954fd6.zip u-boot-imx-c502321c4a1bc8d859ecf19b22f9d0ce03954fd6.tar.gz u-boot-imx-c502321c4a1bc8d859ecf19b22f9d0ce03954fd6.tar.bz2 | |
mtd: cfi_flash: Write buffer size adjustment for M29EW Numonyx devices
This patch addjusted the write buffer size for M29EW devices those
are operated in 8-bit mode.
The M29EW devices seem to report the CFI information wrong when
it's in 8 bit mode.
There's an app note from Numonyx on this issue and there's a patch
in the open source as well for Linux, but it doesn't seem to be in mainline.
Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Tested-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
| -rw-r--r-- | drivers/mtd/cfi_flash.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c index 6b9fc1a..328c76d 100644 --- a/drivers/mtd/cfi_flash.c +++ b/drivers/mtd/cfi_flash.c @@ -2053,6 +2053,26 @@ static void flash_fixup_sst(flash_info_t *info, struct cfi_qry *qry) } } +static void flash_fixup_num(flash_info_t *info, struct cfi_qry *qry) +{ + /* + * The M29EW devices seem to report the CFI information wrong + * when it's in 8 bit mode. + * There's an app note from Numonyx on this issue. + * So adjust the buffer size for M29EW while operating in 8-bit mode + */ + if (((qry->max_buf_write_size) > 0x8) && + (info->device_id == 0x7E) && + (info->device_id2 == 0x2201 || + info->device_id2 == 0x2301 || + info->device_id2 == 0x2801 || + info->device_id2 == 0x4801)) { + debug("Adjusted buffer size on Numonyx flash" + " M29EW family in 8 bit mode\n"); + qry->max_buf_write_size = 0x8; + } +} + /* * The following code cannot be run from FLASH! * @@ -2135,6 +2155,9 @@ ulong flash_get_size (phys_addr_t base, int banknum) case 0x00bf: /* SST */ flash_fixup_sst(info, &qry); break; + case 0x0089: /* Numonyx */ + flash_fixup_num(info, &qry); + break; } debug ("manufacturer is %d\n", info->vendor); |