On Wed, 19 Mar 2014 01:00:41 +0100 David Madl flashrom.org@abanbytes.eu wrote:
Hi,
I have a new prototype development board here, with an 512 MBit Flash chip, Micron N25Q512 (precise type is N25Q512A11G40). I managed to create a config [1] that reads fine, but fails to write [2].
I understand that flashrom cannot access chips larger than 16 MBytes, but the chip should still be able to work in 3-byte addressing mode for the lower 16 MBytes. This is what I have created in flashchips.c (copy & pasted, then adapted from the part N25Q128, assuming with a bit of good faith and some datasheet comparison that they should behave alike).
Has anyone ever successfully written to a small part of a 4-byte flash chip? […] Erasing and writing flash chip... Trying erase function 0... 0x000000-0x000fff:W, 0x001000-0x001fff:E FAILED at 0x00001000! Expected=0xff, Found=0x00, failed byte count from 0x00001000-0x00001fff: 0x1000 ERASE FAILED! Reading current flash chip contents... done. Looking for another erase function. Trying erase function 1... 0x000000-0x00ffff:E FAILED at 0x00000000! Expected=0xff, Found=0x00, failed byte count from 0x00000000-0x0000ffff: 0x10000 ERASE FAILED! Reading current flash chip contents... done. Looking for another erase function. Trying erase function 2... 0x000000-0xffffff:E FAILED at 0x00000000! Expected=0xff, Found=0x00, failed byte count from 0x00000000-0x00ffffff: 0x1000000 ERASE FAILED! Looking for another erase function. No usable erase functions left. FAILED! Uh oh. Erase/write failed. Checking if anything changed. Your flash chip is in an unknown state. Please report this on IRC at chat.freenode.net (channel #flashrom) or mail flashrom@flashrom.org, thanks!
Hi David,
it is almost 2am here, so I wont write a long reply. The log looks to me as if you were not connecting the write protection pin correctly. Maybe that's all what's wrong :)
PS: It would probably be worthwhile for you to look at how patch files work and how you can create them. That eases the communication of changes dramatically.