Originally we use rank_density=0 to mean disable the channel, but actually
rank_density=0 means 4Gb density in the FSP.
This patch changes the LPDDR4 enum values to the real density number and
adds a switch statement to mapping the density define in the FSP.
BUG=b:178665760
BRANCH=NONE
TEST=build fw and flash to the dut, the dut can boot up successfully.
Change-Id: I36dba2cef130211e7aea9e2a4f82c5db78f82a83
Signed-off-by: Jamie Chen <jamie.chen@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56805
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
adda399234