Timothy Pearson (tpearson@raptorengineeringinc.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/12072
-gerrit
commit b3cb2b57dacfb755ed635915c7407893f40cde4e Author: Timothy Pearson tpearson@raptorengineeringinc.com Date: Sun Sep 13 15:54:32 2015 -0500
cpu/amd/fam10h-15h: Enable DFE on Family 15h HT3 links
Decision Feedback Equalization (DFE) is a form of dynamic link training used to lower the overall error rate within the coherent fabric. Enable it on all capable HT links.
Change-Id: I5e719984ddd723f9e375ff1a9d4fa1ef042cf3eb Signed-off-by: Timothy Pearson tpearson@raptorengineeringinc.com --- src/cpu/amd/family_10h-family_15h/defaults.h | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/src/cpu/amd/family_10h-family_15h/defaults.h b/src/cpu/amd/family_10h-family_15h/defaults.h index 28df747..57c0518 100644 --- a/src/cpu/amd/family_10h-family_15h/defaults.h +++ b/src/cpu/amd/family_10h-family_15h/defaults.h @@ -840,4 +840,12 @@ static const struct { { 0xC0, AMD_FAM15_ALL, AMD_PTYPE_ALL, HTPHY_LINKTYPE_ALL, 0x40040000, 0xe01F0000 }, /* [31:29] RttCtl = 02h, [20:16] RttIndex = 04h */ + + { 0xc4, AMD_FAM15_ALL, AMD_PTYPE_ALL, HTPHY_LINKTYPE_HT3, + 0x00013480, 0x0003fc80 }, /* [17:10] DCV = 0x4d, + [7] DfeEn = 0x1 */ + + { 0xd4, AMD_FAM15_ALL, AMD_PTYPE_ALL, HTPHY_LINKTYPE_HT3, + 0x00013480, 0x0003fc80 }, /* [17:10] DCV = 0x4d, + [7] DfeEn = 0x1 */ };