Problems with cfi_cmdset_0002 and Atmel AT49BV642D

[Michael König]

Hello again,

first of all, going through the GIT archive I found out that the 
cfi_cmdset_0002.c in the latest Axis SDK must be the one from 2006-09-22, 
since the last Atmel changes are present but the newest SST additions 
aren't.

Through some testing I found out that do_write_one_word() works just fine, 
and the main problem seems to be do_write_buffer().
To make it work without changing too much, I simply added a call to 
do_write_one_word() in the beginning of do_write_buffer() and then return. 
I'm sure it's less efficient that way, but I wanted to get it to work first.

Since the problem obviously is in do_write_buffer(), I wonder how this 
command sequence works:

cfi_send_gen_cmd(0xAA, cfi->addr_unlock1, chip->start, map, cfi, 
cfi->device_type, NULL);
cfi_send_gen_cmd(0x55, cfi->addr_unlock2, chip->start, map, cfi, 
cfi->device_type, NULL);
//cfi_send_gen_cmd(0xA0, cfi->addr_unlock1, chip->start, map, cfi, 
cfi->device_type, NULL);
/* Write Buffer Load */
map_write(map, CMD(0x25), cmd_adr);

I wasn't able to find that sequence either in the documentation of my Atmel 
chip, or in AMD or Spansion ones.
Is this some undocumented command sequence that isn't implemented by Atmel?
Why isn't the bypass mode used anymore?

Thanks in advance for any insights that might clear up this issue.

-- 
Mit freundlichen Grüßen
Best regards
Michael König

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