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A fix for hynix dram problems seen at 366/244 

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2419 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Ronald G. Minnich 2006-09-18 04:23:23 +00:00
parent 50f84bdea8
commit 0740c31cff
1 changed files with 8 additions and 0 deletions
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8
src/northbridge/amd/gx2/raminit.c
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@ -85,6 +85,14 @@ static void sdram_enable(int controllers, const struct mem_controller *ctrl)
/* load RDSYNC */ /* load RDSYNC */
msr = rdmsr(0x2000001f); msr = rdmsr(0x2000001f);
msr.hi = 0x000ff310; msr.hi = 0x000ff310;
/* the above setting is supposed to be good for "slow" ram. We have found that for
* some dram, at some clock rates, e.g. hynix at 366/244, this will actually
* cause errors. The fix is to just set it to 0x310. Tested on 3 boards
* with 3 different type of dram -- Hynix, PSC, infineon.
* I am leaving this comment here so that at some future time nobody is tempted
* to mess with this setting -- RGM, 9/2006
*/
msr.hi = 0x00000310;
msr.lo = 0x00000000; msr.lo = 0x00000000;
wrmsr(0x2000001f, msr); wrmsr(0x2000001f, msr);