[coreboot-gerrit] Patch merged into coreboot/master: northbridge/amd/amdmct/mct_ddr3: Work around strange phy training issue
gerrit at coreboot.org
gerrit at coreboot.org
Sun Nov 15 02:44:13 CET 2015
the following patch was just integrated into master:
commit 11739a48ce08d1ef11bfd54670ec23a1ee6daccd
Author: Timothy Pearson <tpearson at raptorengineeringinc.com>
Date: Thu Jun 25 18:37:45 2015 -0500
northbridge/amd/amdmct/mct_ddr3: Work around strange phy training issue
AMD Opteron processors contain a very fragile phy phase detection circuit.
Additionally, the algorithm given in the BKDG does not function as intended;
this was verified both on real hardware via execution trace and on paper
with values read back from multiple CPUs and DIMMs.
As a result, the phy training algorithm given in the BKDG has been
replaced with a phy training algorithm developed at Raptor Engineering.
This particular patch is the first part of that algorithm; the code
is updated in future patches but this should exist in the historical
record in case something breaks down in the later sections of code.
Change-Id: Ic7a19d24954f47c922126e3da7be1f7e85f7396f
Signed-off-by: Timothy Pearson <tpearson at raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/12007
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me at gmail.com>
See http://review.coreboot.org/12007 for details.
-gerrit
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