[flashrom] Micron N25Q512, or at least its lower quarter

[Stefan Tauner]

On Wed, 19 Mar 2014 01:00:41 +0100
David Madl <flashrom.org at 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 at 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.

-- 
Kind regards/Mit freundlichen Grüßen, Stefan Tauner