Inagua can use GPIOs 178,179 to switch VMEM to 1.5, 1.35 or 1.25 V,
which it does according to data read from the SO-DIMM's SPD EEPROM.
On Persimmon (according to DB-FT1 rev. D schematics) both GPIOs are
unconnected, there is no way to change the 1.5 V DDR3 voltage (save
unsoldering a resistor). The whole code copied over from Inagua is
useless.
Removed the code, instead a comment hints at Inagua, for people who do designs
based on Persimmon but do have a way to change VMEM.
The line ...->DDR3Voltage = VOLT1_5; is supposed to make the AGESA DDR3 code
select the RAM timings for the actually supplied voltage instead of the
hoped-for but unavailable lower voltage. I have no idea how to test this, but
in any case it can't hurt.
Change-Id: Id098e09418b665645814a6ee2d41a3bff72238ba
Signed-off-by: Jens Rottmann <JRottmann@LiPPERTembedded.de>
Reviewed-on: http://review.coreboot.org/2448
Tested-by: build bot (Jenkins)
Reviewed-by: Peter Stuge <peter@stuge.se>
384ee9f142