[coreboot] 440BX - DFI P2XBL - Which Target?

Roger rogerx.oss at gmail.com
Thu Dec 30 20:45:39 CET 2010

On Thu, Dec 30, 2010 at 10:15:11AM -0900, Roger wrote:
>On Thu, Dec 30, 2010 at 01:55:15AM -0500, Keith Hui wrote:
>>raminit is able to read SPD out of the box, so that's good news. I was
>>hoping to see some differences on how it sees the RAM configuration
>>between cold and warm boot, but there isn't, and it did run through
>>the entire raminit. If you look at the source tree for any of those
>>P2B boards, you'll see some commented out code that does a RAM test.
>>You may want to enable them and see if you can access RAM. And by the
>>way, all 440BX boards now use cache-as-RAM which is different from
>>LinuxBIOS. Again look at those boards and see how Kconfig for such a
>>board should be written up.
>>It could also be how MBFS and MBSC was programmed. Look at the
>>comments in RAM init code (I put them in) and you'll see that it only
>>really applies to a 4-DIMM board. So I'll need you to do one more
>>thing for me.
>>Load up the factory BIOS again. Find three sticks of single sided and
>>3 of double sided RAM. I'm looking for dumps of the PCI config space
>>for 440BX itself, for as much combinations of RAM population you can
>>collect as possible. RAM population as in which RAM stick gets
>>installed in which slot. MBFS is bytes 0xCA to 0xCC. MBSC is bytes
>>0x69 to 0x6E. Might as well just dump the whole 0x60 and 0xC0 rows.
>Here's what I got right now.
># lspci -xxxx
>00:00.0 Host bridge: Intel Corporation 440BX/ZX/DX - 82443BX/ZX/DX Host bridge
>(rev 03)
>60: 10 10 18 20 30 30 30 30 00 23 40 f7 03 e0 00 00
>c0: 00 00 00 00 00 00 00 00 18 0c ff ff 7f 00 00 00
>I'm going to go through my existing RAM combinations with what RAM sticks  I
>have now.  I also think all of this ram is 100 and not 66.

The previous was a mix of:
128M, PC100 consisting of two single sided and one double sided.  Unknown which
banks of order.  Let me know if you need 16x64 layout info, too.

Here's another using only one bank of:
DIMM0, 128M, PC100, Double Sided
60: 08 10 10 10 10 10 10 10 00 0f c0 00 00 8a 00 00
c0: 00 00 00 00 00 00 00 00 18 0c ff ff 67 00 00 00

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