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On 7/31/10 4:56 PM, Zheng Bao wrote:
<blockquote cite="mid:COL112-W293051C453464AA6A6A006CDAB0@phx.gbl"
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The board tht I am working on has 2 process. Each of them has 6
DIMM slots. If you<br>
plug 1 dimm into each slot, the SPD address will be,<br>
Channel PCB<br>
----------------<br>
P0:<br>
DIMMA0 50h<br>
DIMMA1 51h<br>
DIMMA2 52h<br>
DIMMB0 53h<br>
DIMMB1 54h<br>
DIMMB2 55h<br>
P1:<br>
DIMMA0 50h<br>
DIMMA1 51h<br>
DIMMA2 52h<br>
DIMMB0 53h<br>
DIMMB1 54h<br>
DIMMB2 55h<br>
If you plug 1 dimm in P0DIMMA0 and the other in P1DIMA0, the SPD
address<br>
will be 50h and 55h.<br>
So I am confused. If we got an active spd 0x50 on the SMBUS, what
will it be?<br>
It seems that we can not plug more that 8 dimm even if we have 12
slots, correct?<br>
<br>
Zheng<br>
<br>
</blockquote>
<br>
<br>
There is probably an smbus hub for switching between the P0 and P1
SPD ROMs.<br>
<br>
Check out src/mainboard/tyan/s4880/romstage.c for an example of a
board with smbus hub.<br>
<br>
Stefan<br>
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