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

1 files changed, 8 insertions, 0 deletions

diff --git a/src/northbridge/amd/gx2/raminit.c b/src/northbridge/amd/gx2/raminit.c
index fcc05e92f4..e45d696e35 100644
--- a/src/northbridge/amd/gx2/raminit.c
+++ b/src/northbridge/amd/gx2/raminit.c
@@ -85,6 +85,14 @@ static void sdram_enable(int controllers, const struct mem_controller *ctrl)
 	/* load RDSYNC */
 	msr = rdmsr(0x2000001f);
 	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;
 	wrmsr(0x2000001f, msr);