[coreboot] Probe missing on W49F002U

Carl-Daniel Hailfinger c-d.hailfinger.devel.2006 at gmx.net
Mon Mar 3 14:26:31 CET 2008

On 03.03.2008 07:10, Jun Ma wrote:
> [MJ]  for my poor board SIS5595/W49F002U, there seems no WP#
> function, you can get DS from:
> http://www.winbond-usa.com/products/winbond_products/pdfs/Memory/w49f002u.pdf

There is a write protection function in the W49F002U: #WE, but the 
signal is inverted.

>>> Can you guide me in a better direction? I will try my best on this
>>> test.
>> In order to find out about the GPIO you can either:
>> * Use a multimeter to check if any GPIO pin on the southbridge is
>>  connected to the flash chip write protect
>> * Save all GPIO registers from booting with factory BIOS
>>  Compare with GPIO registers from booting with coreboot
>>  Set one GPIO register bit at a time and test if flashrom can
>>  identify the flash chip automatically. (That requires write to work
>>  correctly.)
> [MJ] I suppose that there has no WP# pin on W49F002U, so there should
> not have any GPIO pin connected between South bridge and BIOS.

See above.


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