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flash v2 program problem
- From: Manfred Gruber <gruber dot m at utanet dot at>
- To: <ecos-discuss at sources dot redhat dot com>
- Date: Fri, 1 Jul 2005 15:23:14 +0200
- Subject: [ECOS] flash v2 program problem
Hi !
I use flash_v2 branch and have a problem on program my device. I use a
AM29LV256, 2 x 16 bit devices on a 32 bit bus . On testing I found out that
Toggle Bit DQ6 functionality fails sometimes on my hardware. I had done a
quick dirty hack, with that it works. can someone tell me why?
#ifdef MICRO9_FLASH_V2_CHANGES
// Quick dirty hack
do {
current = addr[i];
if ((current & AM29_STATUS_DQ7) == masked_datum) {
break;
}
if (0 != (current & AM29_STATUS_DQ5)) {
continue;
}
} while (retries-- > 0);
#else
// original version
do {
current = addr[i];
if ((current & AM29_STATUS_DQ7) == masked_datum) {
break;
}
if (0 != (current & AM29_STATUS_DQ5)) {
// It's possible that one device can finish before
// another. To deal with this we look at the DQ6
// toggle bit, and only consider this to be an error
// if it is still toggling for the device that's
// reporting DQ5 set. This is similar to the checking
// for erase timeouts above. This is unnecessary
// before DQ5 gets set, so we don't do the double read
// all the time.
current2 = addr[i];
-->>>> Sometimes my devices fail here ....
if ((((current ^ current2) & AM29_STATUS_DQ6) >> 1) & current)
{
// A timeout has occurred inside the hardware and
// the system is in a strange state. Reset but don't
// try to write any more of the data.
block_start[AM29_OFFSET_COMMAND] = AM29_COMMAND_RESET;
return;
}
}
} while (retries-- > 0);
#endif
for example it fails with this values:
am29xxxxx_hw_programm:
current 0xff847abf
current2 0xffc45a5a
AM_STATUS 400040
((((current ^ current2) & AM29_STATUS_DQ6) >> 1) & current) --> 200020
i tried to use the toggle bit algorithm from my am29lv256 documentation, but
without sucess. maybe some flash_v2 developer has a mor information for me
what goes wrong?
regards manfred
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