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nb/intel/sandybridge: Allow to ignore XMP voltage

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Native raminit only supports 1.5V operation, but there are DIMMs which
request 1.65V operation in XMP profiles. Add an option to force XMP to
be used when the requested voltage isn't supported, which will run the
DIMMs at 1.5V with XMP timings. Consider this to be overclocking.

Change-Id: I64bfac8f72dadf662ceadfc7998daf26edf5a710
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48614
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
This commit is contained in:
Angel Pons
2020-12-12 16:22:18 +01:00
committed by Felix Held
parent e0183d6540
commit 3170e9c0ef
2 changed files with 19 additions and 1 deletions
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7
src/northbridge/intel/sandybridge/raminit.c
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@ -200,7 +200,12 @@ static void dram_find_spds_ddr3(spd_raw_data *spd, ramctr_timing *ctrl)
/* TODO: Support DDR3 voltages other than 1500mV */
printram("XMP profile's requested %u mV is unsupported.\n",
dimm->voltage);
spd_decode_ddr3(dimm, spd[spd_slot]);
if (CONFIG(NATIVE_RAMINIT_IGNORE_XMP_REQUESTED_VOLTAGE))
printk(BIOS_WARNING,
"XMP requested voltage will be ignored.\n");
else
spd_decode_ddr3(dimm, spd[spd_slot]);
}
/* Fill in CRC16 for MRC cache */