Messages in this thread Patch in this message | | | From | Niklas Söderlund <> | Subject | [PATCH] amd64_edac: fix size decoding error on K8 | Date | Wed, 9 Nov 2011 15:32:58 +0100 |
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Use a lookup table to calculate the size of a chip select. The old method of calculating size return erroneous values for some memory configurations. The lookup table is transcribed from "DRAM CS Address Mapping Register" [1], pages 88-89.
[1] BIOS and Kernel Developer's Guide for the AMD Athlon 64 and AMD Opteron Processors - Revision 3.30 - doc #26094 - February 2006 http://support.amd.com/us/Processor_TechDocs/26094.pdf
Signed-off-by: Niklas Söderlund <niklas.soderlund@ericsson.com> --- drivers/edac/amd64_edac.c | 10 +++++----- 1 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c index 9a8bebc..396ea76 100644 --- a/drivers/edac/amd64_edac.c +++ b/drivers/edac/amd64_edac.c @@ -1108,6 +1108,10 @@ static int ddr2_cs_size(unsigned i, bool dct_width) static int k8_dbam_to_chip_select(struct amd64_pvt *pvt, u8 dct, unsigned cs_mode) { + static const int rev_de_lookup[] = { 32, 64, 128, 128, 256, 512, 256, + 512, 1024, 1024, 2048 }; + + u32 dclr = dct ? pvt->dclr1 : pvt->dclr0; if (pvt->ext_model >= K8_REV_F) { @@ -1116,11 +1120,7 @@ static int k8_dbam_to_chip_select(struct amd64_pvt *pvt, u8 dct, } else if (pvt->ext_model >= K8_REV_D) { WARN_ON(cs_mode > 10); - - if (cs_mode == 3 || cs_mode == 8) - return 32 << (cs_mode - 1); - else - return 32 << cs_mode; + return rev_de_lookup[cs_mode]; } else { WARN_ON(cs_mode > 6); -- 1.7.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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