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This adds U-Boot configuration for the Samsung Chromebook Plus (v1),
also known as "chromebook_kevin" in the U-Boot upstream defconfigs. Also
adds a shared "gru" board directory to share with others having the same
baseboard.
It uses v2022.07 with some quality-of-life patches. The first one is a
clock adjustment to match coreboot clocks for the video output, the
second one is a series about text cursor support and larger fonts. These
are because the display has a high resolution of 2400x1600 at 12.3".
The config has the following diffconfig from the upstream defconfig for
this board:
# For chainloading from depthcharge like a payload (RW_LEGACY).
# Not everything might be necessary, but didn't test without these.
INIT_SP_RELATIVE n -> y
LNX_KRNL_IMG_TEXT_OFFSET_BASE 0x00200000 -> 0x18000000
POSITION_INDEPENDENT n -> y
SYS_TEXT_BASE 0x00200000 -> 0x18000000
+SYS_INIT_SP_BSS_OFFSET 524288
# Higher speeds for eMMC
MMC_HS200_SUPPORT n -> y
MMC_HS400_ES_SUPPORT n -> y
MMC_HS400_SUPPORT n -> y
MMC_IO_VOLTAGE n -> y
MMC_SDHCI_SDMA n -> y
MMC_SPEED_MODE_SET n -> y
+MMC_UHS_SUPPORT y
# Build the u-boot.elf to use as a payload
REMAKE_ELF n -> y
# Slightly faster video output
VIDEO_COPY n -> y
# Larger fonts per the applied series
VIDEO_FONT_8X16 y -> n
VIDEO_FONT_TER16X32 n -> y
Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
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