[coreboot] [PATCH] ASUS P2B-LS support, RAM detection for 440BX, add Slot 1 CPU, Microcode for Intel Tualatin CPUs

Uwe Hermann uwe at hermann-uwe.de
Thu Mar 4 13:30:06 CET 2010

On Thu, Mar 04, 2010 at 10:05:57AM +0000, Mark Marshall wrote:
> On 03/03/10 04:19, Keith Hui wrote:
> >Hi all,
> >
> >This thing is now ready for more exposure. Scratch my previous "patch" -
> >this is my first real deal.
> >
> >- Adds RAM detection for i440bx (based on i82830 code). We're no longer
> >hard coded for 64MB on one row!
> Hi.
> I've tried this with my ASUS P2B, and it's not quite there yet.
> The first problem is that this motherboard only has three DIMM
> slots. This means you have to set SDRAMC to something different;
> 0x0103 works for me.
> I'm guessing that we will need a motherboard config option for this
> - there doesn't seem to be one suitable?  Something like:
> src/mainboard/asus/p2b/Kconfig:
> 	int
> 	default 3
> 	depends on BOARD_ASUS_P2B

Yes, sounds good. We will either need this, or maybe the settings can be
auto-detected / probed (need to check datasheet, but I guess it's unlikely).

Hm, seems to be determined by SDRAMPWR + MMCONFIG, and MMCONFIG seems to
be a hardware-strap (so we can check it), but not sure about SDRAMPWR.

> The second problem is that it doesn't work with more that 256 MB of
> memory.  I've had one stick of 128 MB work, two sticks of 128 MB and
> one stick of 256 MB all work, but two sticks of 256 MB doesn't boot
> linux.

Hm, will investigate. Are you sure both 256MB DIMMs work under vendor
BIOS (so we can exclude hardware issues)?

Thanks for testing!

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