mb/siemens/mc_ehl4: Make DRAM population depending on GPIO GPP_B5

GPIO GPP_B5 is used as input on this mainboard. For a full-populated
DRAM configuration, the input signal is connected to ground and for a
half-populated configuration it is connected to 3.3 V.

BUG=none
TEST=Use different HW configurations and check coreboot log

GPP_B5 = 0:
[DEBUG]  2 DIMMs found

GPP_B5 = 1:
[INFO ]  meminit_channels: DRAM half-populated
[DEBUG]  1 DIMMs found

Change-Id: I48b4a3bea7f1ff804b78b7c648a7ea1925627b8a
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76245
Reviewed-by: Jan Samek <jan.samek@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>

0 files changed, 0 insertions, 0 deletions