Hello Wolfgang & list,
I have "ported" U-boot to a in house made board with Numonyx Axcell P33/P30
256-Mbit 65nm flash chips.
After some time :( searching for bugs in our board or soft, we have
discovered that those chips have a small but annoying bug, documented in
"Numonyx Axcell P33/P30 256-Mbit Specification Update"
It states :
When customer uses [...] block unlock, the block lock status might be
altered inadvertently. Lock status might be set to either 01h or 03h
unexpectedly (00h as expected data), which leads to program/erase failure
on certain blocks.
A working workaround is given, which I have applied and tested with success.
Signed-off-by: Philippe De Muyter <p...@macqel.be>
---
drivers/mtd/cfi_flash.c | 27 ++++++++++++++++++++-------
1 files changed, 20 insertions(+), 7 deletions(-)
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
index 3267c5d..0931137 100644
--- a/drivers/mtd/cfi_flash.c
+++ b/drivers/mtd/cfi_flash.c
@@ -1347,16 +1347,29 @@ int flash_real_protect (flash_info_t * info, long
sector, int prot)
switch (info->vendor) {
case CFI_CMDSET_INTEL_PROG_REGIONS:
case CFI_CMDSET_INTEL_STANDARD:
- case CFI_CMDSET_INTEL_EXTENDED:
- flash_write_cmd (info, sector, 0,
- FLASH_CMD_CLEAR_STATUS);
- flash_write_cmd (info, sector, 0, FLASH_CMD_PROTECT);
+ case CFI_CMDSET_INTEL_EXTENDED: {
+ unsigned short cmd;
+
if (prot)
- flash_write_cmd (info, sector, 0,
- FLASH_CMD_PROTECT_SET);
+ cmd = FLASH_CMD_PROTECT_SET;
else
+ cmd = FLASH_CMD_PROTECT_CLEAR;
+ /* see errata
+ "Numonyx Axcell P33/P30 Specification Update" :) */
+ flash_write_cmd (info, sector, 0, FLASH_CMD_READ_ID);
+ if (!flash_isequal (info, sector, FLASH_OFFSET_PROTECT,
+ prot)) {
+ /* cmd must come before 20us after
FLASH_CMD_PROTECT */
+ /* Disable interrupts which might cause a
timeout here */
+ int flag = disable_interrupts ();
flash_write_cmd (info, sector, 0,
- FLASH_CMD_PROTECT_CLEAR);
+ FLASH_CMD_PROTECT);
+ flash_write_cmd (info, sector, 0, cmd);
+ /* re-enable interrupts if necessary */
+ if (flag)
+ enable_interrupts ();
+ }
+ }
break;
case CFI_CMDSET_AMD_EXTENDED:
case CFI_CMDSET_AMD_STANDARD:
--
1.6.3.3
--
Philippe De Muyter phdm at macqel dot be Tel +32 27029044
Macq Electronique SA rue de l'Aeronef 2 B-1140 Bruxelles Fax +32 27029077
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