diff options
| author | Timothy Pearson <tpearson@raptorengineeringinc.com> | 2015-09-05 18:00:27 -0500 |
|---|---|---|
| committer | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2015-10-27 05:31:57 +0100 |
| commit | 99e1a672ecf99f8fa083e601a3c695eb02e93a33 (patch) | |
| tree | 7509377687d8adee449691d5d9e8f54e0a33dc00 /src/northbridge/amd/amdmct | |
| parent | b8a355dcdf319671b97f8688209ad5d471fc0905 (diff) | |
northbridge/amd/amdfam10: Limit maximum RAM clock to BKDG recommendations
Change-Id: I45eb03a4b351e458e8448245896743bd6fa57637
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/11943
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/northbridge/amd/amdmct')
| -rw-r--r-- | src/northbridge/amd/amdmct/wrappers/mcti_d.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/northbridge/amd/amdmct/wrappers/mcti_d.c b/src/northbridge/amd/amdmct/wrappers/mcti_d.c index f9a9921e6e..444adc513a 100644 --- a/src/northbridge/amd/amdmct/wrappers/mcti_d.c +++ b/src/northbridge/amd/amdmct/wrappers/mcti_d.c @@ -301,6 +301,8 @@ static void mctGet_MaxLoadFreq(struct DCTStatStruc *pDCTstat) /* Determine the number of installed DIMMs */ int ch1_count = 0; int ch2_count = 0; + uint8_t ch1_registered = 0; + uint8_t ch2_registered = 0; int i; for (i = 0; i < 15; i = i + 2) { if (pDCTstat->DIMMValid & (1 << i)) @@ -308,13 +310,19 @@ static void mctGet_MaxLoadFreq(struct DCTStatStruc *pDCTstat) if (pDCTstat->DIMMValid & (1 << (i + 1))) ch2_count++; } + for (i = 0; i < MAX_DIMMS_SUPPORTED; i = i + 2) { + if (pDCTstat->DimmRegistered[i]) + ch1_registered = 1; + if (pDCTstat->DimmRegistered[i + 1]) + ch2_registered = 1; + } if (IS_ENABLED(CONFIG_DEBUG_RAM_SETUP)) { printk(BIOS_DEBUG, "mctGet_MaxLoadFreq: Channel 1: %d DIMM(s) detected\n", ch1_count); printk(BIOS_DEBUG, "mctGet_MaxLoadFreq: Channel 2: %d DIMM(s) detected\n", ch2_count); } /* Set limits if needed */ - pDCTstat->PresetmaxFreq = mct_MaxLoadFreq(max(ch1_count, ch2_count), pDCTstat->PresetmaxFreq); + pDCTstat->PresetmaxFreq = mct_MaxLoadFreq(max(ch1_count, ch2_count), (ch1_registered || ch2_registered), pDCTstat->PresetmaxFreq); } #ifdef UNUSED_CODE |