Recently, gru boards were migrated to use common stack addresses with
U-Boot commit 5e7cd8a11995 ("rockchip: Use common bss and stack
addresses on RK3399") and commit 49f8131e5594 ("rockchip: rk3399-gru:
Use TPL with common bss and stack addresses"). This is done with the
ROCKCHIP_COMMON_STACK_ADDR config.

With POSITION_INDEPENDENT, INIT_SP_RELATIVE defaults to enabled as well.
However, ROCKCHIP_COMMON_STACK_ADDR selects HAS_CUSTOM_SYS_INIT_SP_ADDR,
which depends on INIT_SP_RELATIVE being disabled. So this results in a
configuration warning:

  WARNING: unmet direct dependencies detected for HAS_CUSTOM_SYS_INIT_SP_ADDR
    Depends on [n]: ARM [=y] && ARCH_KIRKWOOD [=n] || ARC [=n] || ARM [=y] && !INIT_SP_RELATIVE [=y] || MIPS [=n] || PPC [=n] || RISCV [=n]
    Selected by [y]:
    - ROCKCHIP_COMMON_STACK_ADDR [=y] && ARM [=y] && ARCH_ROCKCHIP [=y] && SPL_SHARES_INIT_SP_ADDR [=y]

I'm not sure if adhering to the Rockchip values means we can't be
position-independent. Disabling INIT_SP_RELATIVE still appears to keep
my kevin board working, so let's do that for now.

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

Run `./mk -l u-boot` to regenerate full configs from our new defconfigs.

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

Apply our preserved changes to the new U-Boot defconfigs. Upstream
rearranged memory layouts for Rockchip boards to a unified layout, which
got rid of CUSTOM_SYS_INIT_SP_ADDR and HAS_CUSTOM_SYS_INIT_SP_ADDR, and
will need a change to a related INIT_SP_RELATIVE later.

Normalize the positions of each line in the config by regenerating the
defconfig by `./mk -l u-boot` and then `./mk -s u-boot`, so that the
diff looks all green when we actually expand it to the full config.

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

Copy over the new upstream defconfigs from the refreshed U-Boot trees,
so we can fold our modifications into them. Manually done, but like:

    do_defconfig() {
        ours="$1"
        theirs="$2"
        tree="$3"

        cp src/u-boot/${tree}/configs/${theirs}_defconfig \
           config/u-boot/${ours}/config/default
    }

    do_defconfig  amd64coreboot   coreboot64        x86_64
    do_defconfig  i386coreboot    coreboot          x86
    do_defconfig  gru_bob         chromebook_bob    default
    do_defconfig  gru_kevin       chromebook_kevin  default
    do_defconfig  qemu_arm_12mb   qemu_arm64        default

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

Run diffconfig from Linux to track our modifications to the old upstream
defconfigs, so we can apply them to the new ones. Restore the original
defconfigs to highlight our changes here, and upstream changes in the
next commit. Done manually, but something like:

  do_diff() {
      ours="$1"
      theirs="$2"
      tree="$3"

      diffconfig \
          src/u-boot/${tree}/configs/${theirs}_defconfig \
          config/u-boot/${ours}/config/default \
          >config/u-boot/${ours}/config/diffconfig

      cp src/u-boot/${tree}/configs/${theirs}_defconfig \
          config/u-boot/${ours}/config/default
  }

  do_diff amd64coreboot    coreboot64        x86_64
  do_diff i386coreboot     coreboot          x86
  do_diff gru_bob          chromebook_bob    default
  do_diff gru_kevin        chromebook_kevin  default
  do_diff qemu_arm64_12mb  qemu_arm64        default

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

Run `./mk -s u-boot` to convert our configs into defconfigs, so we can
keep our changes to the old upstream defconfigs and re-apply them to the
new upstream defconfigs.

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

Signed-off-by: Leah Rowe <leah@libreboot.org>

The bootflow menu is already the default boot command on x86. Switch
arm64 boards to that as well, so instead of booting the first thing we
find, we can easily choose what to boot.

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

U-Boot on ARM64 also enables the bootflow menu.

Signed-off-by: Leah Rowe <leah@libreboot.org>

We need to initialize the USB subsystem before we can use USB devices
like keyboards and external disks, by running `usb start`. Use the
PREBOOT config option to run the necessary command before U-Boot tries
to automatically boot anything. It's already enabled for boards other
than gru_kevin and gru_bob, so just update those two configs.

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>