Intel compatible flash device issue
mareksk7 at gazeta.pl
Tue Jun 22 15:03:29 EDT 2004
I have encountered a problem using M28W160CT flash chip as
LINUX character device. This chips is compatible with INTEL standard
Since the chip is locked after power-up, there is required to unlock
some blocks before write operation. Of course, this can be done
from any application using MEMUNLOCK command.
Once the MEMUNLOCK command is executed (without any error)
the flash chip remains in the "command" state.
This state after MEMUNLOCK blocks any read access to data stored
in the flash.
Reviewing the cfi_cmdset_0001.c file I have found that single block
(un)lock algorithm (do_xxlock_oneblock) is different from these
described in the following documents:
- STM M28W160CT datasheet (figure 22)
- Intel 28F160C3 datasheet (figure 20)
It seems that there should be issued the reset command (0xff) just
after lock (0x01)/unlock (0xd0) command.
Any comments, ideas ?
Thanks in advance,
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