#151: 256 Meg RAM support
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Reporter: jg | Owner: [EMAIL PROTECTED]
Type: enhancement | Status: assigned
Priority: blocker | Milestone: BTest-1
Component: linuxbios | Resolution:
Keywords: |
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Comment (by [EMAIL PROTECTED]):
I made the change in my private tree and tested it on both a 128 MB Btest
board and a 256 MB Btest board. Both work. On the 256M board, 256MB of
memory (less that used by SMM and video) is indeed available and
accessible.
The change was simple because the chips are high compatible. The only
significant difference is the number of column address bits. The changed
boiled down to changing two fields - DIMM0 Size and DIMM0 Page Size - in
the MC_CF07_DATA MSR. The code first reads the value of GPIO bit 2 to
determine which values to use.
I'm not going to release a new firmware image with this change today.
Since I have the only 256 MB board, who would test it?
--
Ticket URL: <http://dev.laptop.org/ticket/151#comment:5>
One Laptop Per Child <http://laptop.org/>
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