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nb/intel/sandybridge: Allow to ignore XMP voltage 

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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13
src/northbridge/intel/sandybridge/Kconfig
View File

@ -64,6 +64,19 @@ config NATIVE_RAMINIT_IGNORE_XMP_MAX_DIMMS
Disabled by default as it might cause system instability.
Handle with care!
config NATIVE_RAMINIT_IGNORE_XMP_REQUESTED_VOLTAGE
bool "Ignore XMP profile requested voltage"
default n
depends on USE_NATIVE_RAMINIT
help
Native raminit only supports 1.5V operation, but there are DIMMs
which request 1.65V operation in XMP profiles. This option allows
raminit to use these XMP profiles anyway, instead of falling back
to non-XMP settings.
Disabled by default because it allows forcing memory to run out of
specification. Consider this to be an overclocking option.
Handle with care!
config CBFS_SIZE
hex
default 0x100000

7
src/northbridge/intel/sandybridge/raminit.c
View File

@ -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 */