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authorTimothy Pearson <tpearson@raptorengineeringinc.com>2015-08-07 19:05:45 -0500
committerMartin Roth <martinroth@google.com>2015-11-20 23:54:40 +0100
commitfdf31cb9d9dab81817463512a9159f0bdb568339 (patch)
tree0ea43821c443d7d19a959b118fba5ae37c8fa749 /src/northbridge
parent7c55f374d1bc9e87005cea288fa1a00c48c69b54 (diff)
downloadcoreboot-fdf31cb9d9dab81817463512a9159f0bdb568339.tar.xz
northbridge/amd/amdht: Add comment for HT Freq write ordering
The BKDG is not correct regarding HT Freq write ordering; indicate this in a comment to avoid confusion. Change-Id: I37db191c144c81aba5d4a1e6291db5669a35a31a Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com> Reviewed-on: http://review.coreboot.org/12030 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'src/northbridge')
-rw-r--r--src/northbridge/amd/amdht/h3ncmn.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/northbridge/amd/amdht/h3ncmn.c b/src/northbridge/amd/amdht/h3ncmn.c
index 29524afee0..c97d59293f 100644
--- a/src/northbridge/amd/amdht/h3ncmn.c
+++ b/src/northbridge/amd/amdht/h3ncmn.c
@@ -1555,6 +1555,10 @@ static void setLinkData(sMainData *pDat, cNorthBridge *nb)
} else {
temp2 = 0x0;
}
+ /* NOTE
+ * The Family 15h BKDG Rev. 3.14 is wrong
+ * Freq[4] must be set before Freq[3:0], otherwise the register writes will be ignored!
+ */
if (is_gt_rev_d())
AmdPCIWriteBits(linkBase + HTHOST_FREQ_REV_REG_2, 0, 0, &temp2);
AmdPCIWriteBits(linkBase + HTHOST_FREQ_REV_REG, 11, 8, &temp);