答复: AMD K8 memory bug with more than 2 banks - coreboot

18 Mar 2004

According to data sheet, should do the change.
-----邮件原件-----
发件人: Hendricks David W. [mailto:dwh@lanl.gov] 
发送时间: 2004年3月18日 16:23
收件人: Craig C Forney
抄送: linuxbios@clustermatic.org
主题: Re: AMD K8 memory bug with more than 2 banks
I have applied your fix and booted it up on a Tyan S2885 mainboard with 
four banks full, but have not noticed any change in non-reserved 
registers on the AMD 8111. Can you please elaborate on exactly what 
changes I might observe? I want to check out the specifications on the 
memory we're using and make sure we're getting the right values.
On Tue, 16 Mar 2004, Craig C Forney wrote:
...
I ran into a problem with a Dual Opeteron cPCI board we developed with 4
banks of memory.  It showed up when the third and fourth banks were
populated.  I narrowed it down to a problem in src/amd/amdk8/raminit.c.
There is a '+' where there should be a '*', causing the SPD settings to
get corrupted, which causes bizarre results which varies depending on
the memory parameters read from the DIMMs.  One possible result is that
some DIMMs will work marginally because one or more of their settings
has been corrupted.
This patch seems to resolve the problem.  I'm not sure if anybody else
out there is accessing 4 banks of memory via the Opteron memory
interface, so it might be just us, but it would probably be a good idea
to commit this patch to the freebios2 source tree.  Can someone take
this on?
Thanks,
Craig Forney
Opus Innovations LLC
diff -Naur raminit.c.orig raminit.c

--- raminit.c.orig	2004-03-16 13:25:05.000000000 -0800
+++ raminit.c	2004-03-16 13:42:30.000000000 -0800
@@ -924,7 +924,7 @@
   	sz.side2 = 0;
   }
   map = pci_read_config32(ctrl->f2, DRAM_BANK_ADDR_MAP);

map &= ~(0xf << (index + 4));


map &= ~(0xf << (index * 4));
/* For each base register.

Place the dimm size in 32 MB quantities in the bits 31 - 21.




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