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

Mark Marshall mark.marshall60 at ntlworld.com
Fri Mar 5 09:03:21 CET 2010

On 04/03/10 13:10, Joseph Smith wrote:
> On 03/04/2010 07:38 AM, Joseph Smith wrote:
>> On 03/04/2010 07:30 AM, Uwe Hermann wrote:
>>> On Thu, Mar 04, 2010 at 10:05:57AM +0000, Mark Marshall wrote:
>>>> On 03/03/10 04:19, Keith Hui wrote:
>>>> 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.
>>> 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.
>  >>>
> I think a simple SPD probe would work, if the correct value is returned
> you know you have memory in that slot, otherwise if 0xff is returned
> then no memory is present. Do this probe for as many slots as the 440
> supports. Then set your registers based on that.

The issue here is the number of DIMM slots on the motherboard, not the 
number of sticks in the slots.  Some 440BX boards have four slots, while 
others only have three.


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