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authorDamien Zammit <damien@zamaudio.com>2016-07-24 03:28:42 +1000
committerKyösti Mälkki <kyosti.malkki@gmail.com>2016-07-27 11:40:33 +0200
commit7c2e5396a3d47c64eb5a553fe412aad4c0f8dc1b (patch)
treeab4b3ecab2082c10d962c4e25314d2287bcd2519 /src/cpu
parent40d93494c3dcfe7850aed056e1ad9c4b285c0f5b (diff)
nb/intel/x4x: Fix CAS latency detection and max memory detection
Now hardcode maximum memory frequency capability to 800MHz, as all chipsets in x4x family support PC2-6400 according to the datasheet. CAS latency detection also relies on this, and has been cleaned up. Ram initialization does not work with FSB 1333MHz / DDR2 800MHz combination, so disable this combination for now, and reduce to 667MHz instead. Still don't know why this is the case, but FSB1333/667 works. These changes should now allow existing configurations to continue working, while providing support for previously unworking configurations, due to previous buggy CAS latency detection code. TESTED: on GA-G41M-ES2L CPU: E5200 @ 2.50GHz (FSB 800MHz) 2x 1GB 667MHz hynix worked @ 667 1x 2GB 800Mhz ARAM worked @ 800 1x 1GB 667Mhz StarRam worked @ 667 2x 2GB 800Mhz (generic) worked @ 800 Change-Id: I1ddd7827ee6fe3d4162ba0546f738a8f9decdf93 Signed-off-by: Damien Zammit <damien@zamaudio.com> Reviewed-on: https://review.coreboot.org/15818 Tested-by: build bot (Jenkins) Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
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