[coreboot] flashrom and PM49FL004/2

Nikolay Petukhov nikolaypetukhov at gmail.com
Tue Mar 11 11:12:37 CET 2008

Hi, all.

I have PCISA-LX-800 board (AMD LX800 + CS5536)

The flashrom detect flash device on this board,
hier flashrom output:
  Pm49FL004 found at physical address 0xfff80000.
  Flash part is Pm49FL004 (512 KB).

But the flashrom has problems with write and erasing operations to
this flash device.

The data-sheet on PM49FL004/2 say that:
This flash device can work in two modes: LPC and FWH.

On this board flash device be in FWH mode
(MSR_DIVIL_BALL_OPT(0x51400015) = 0x00000f7d)

Also data-sheet on PM49FL004/2 say that:
In FWH mode are available Block Locking Registers and in default flash
is locked for write/erasing.

This patch add unlocking operation PM49FL004/2 before write/erasing operation.

Signed-off-by: Nikolay Petukhov <nikolay.petukhov at gmail.com>

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