This patch simplifies flash_toggle() (AMD commandset), which is used to detect if a FLASH device is still busy with erase/program operations. On 800MHz Canyonlands/Glacier boards (460EX/GT) the current implementation did not detect the busy state reliably, resulting in non erased sectors etc. This patch now simplifies this function by "just" comparing the complete data-word instead of ANDing it with the command-word (0x40) before the compatison. It is done the same way in the Linux implementation chip_ready() in cfi_cmdset_0002.c.
Signed-off-by: Stefan Roese sr@denx.de ---
I have to admit that I don't really understand *why* this simplified version fixes this problem. Does anybody else have some ideas on this?
BTW: I'll leave for a short trip in a few hours. So please don't expect any further mails from me till Thursday this week.
Thanks, Stefan
drivers/mtd/cfi_flash.c | 12 ++++-------- 1 files changed, 4 insertions(+), 8 deletions(-)
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c index d505bc8..c0ea97b 100644 --- a/drivers/mtd/cfi_flash.c +++ b/drivers/mtd/cfi_flash.c @@ -581,20 +581,16 @@ static int flash_toggle (flash_info_t * info, flash_sect_t sect, flash_make_cmd (info, cmd, &cword); switch (info->portwidth) { case FLASH_CFI_8BIT: - retval = ((flash_read8(addr) & cword.c) != - (flash_read8(addr) & cword.c)); + retval = flash_read8(addr) != flash_read8(addr); break; case FLASH_CFI_16BIT: - retval = ((flash_read16(addr) & cword.w) != - (flash_read16(addr) & cword.w)); + retval = flash_read16(addr) != flash_read16(addr); break; case FLASH_CFI_32BIT: - retval = ((flash_read32(addr) & cword.l) != - (flash_read32(addr) & cword.l)); + retval = flash_read32(addr) != flash_read32(addr); break; case FLASH_CFI_64BIT: - retval = ((flash_read64(addr) & cword.ll) != - (flash_read64(addr) & cword.ll)); + retval = flash_read64(addr) != flash_read64(addr); break; default: retval = 0;