Looks like on the board the Boot Options are hardwired to FWH so all that I need to do would be to increase the ROM size and it should work. 49LF004B works both in FWH mode and also in LPC mode.
 
-Phani

On Fri, Feb 22, 2008 at 2:14 PM, Marc Jones <marc.jones@amd.com> wrote:


Phani Babu Giddi wrote:
> Hello All,
>
> I am planning to use the BIOS chip SST49LF008A instead of SST49LF004B on
> AMD's Geode LX 800 development board DB800. Do you think this will work
> without changing any optiong in Config.lb <http://Config.lb> for this
> board. 49LF004B is based on LPC while 49LF008A is based on FWH. I had to
> change the part because LPC interface based chip by SST has been EOLed.
>

If you change the size (8A is 1Mb and 4B is 512KB right?) you will need
to make an adjustment in the target/../config.lb in order to get the
correct ROM size.
option ROM_SIZE=1024*1024-36*1024

> The best way for me would have been to test it and find it out myself
> but currently coreboot build is failing on Fedora 8 based system even
> after applying the rececent patches and updates to LD.
>

I will take a closer look at the failure you sent.

> I am just curious does CS5536 has to be initalized in a differently to
> be able to boot from FWH ?

You will need check cs5536 boot straps are set to FWH. You can check it
in this MSR:

6.6.2.10 Ball (Pin) Options Control (DIVIL_BALL(PIN)_OPTS)
MSR Address 51400015h
Type R/W
Reset Value 00000x7xh



Marc

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Marc Jones
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mailto:Marc.Jones@amd.com
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