we currently distinguish, by virtue of logic, multi-
and single-tree projects. this introduces a lot of
complexity, so the following patch has removed this
distinction. all single-tree projects are now multi
tree, but with only one tree.

other design changes:

config/git removed. rev/tree now handled with mkhelper
and target configs. this allows per-tree remote handling,
so we could (for example) add the mrchromebox coreboot
fork easily, for specific chromebook models.

config/project is now config/module/project. this
cleans up the main config/ directory.

cfgname variable: .config no longer hardcoded when
doing configs in projects. it is configurable with
this variable. if unset, the previous .cfg is used

noconfig variable: set this in target/mkhelper
configs, and config/module/project/tree/config/ is
unused; instead, make is called without config copying.
a "noconfig" placeholder is used. this enables cleaner
usage of previously single-tree projects in the new
multi-tree-only structure.

cfgvars: variables reinitialised in project config are
cleaned more reliably. in particular, several variables
e.g. autogenargs were not being reset between projects,
although the autogenargs variable is currently unused.

general cleanup has been conducted across the build
system, as part of this redesign. several parts of the
build system more over-engineered as a result of the
previous design, and the new design enabled a severe
reduction in sloccount (75 lines reduced in lbmk).

yes, this change *adds features* but there are fewer
lines of code than before. this is the best kind of
change. way better than the 3-line-diff. yes.

rev= and tree= are set more centrally in configs. the
mkhelper config can be used to set url/url_bkup, but
individual trees can override them.

configs have been cleaned up, with several variables
now much more heavily centralised. config/git/ was
used before to first download the bare repository, and
then the real clone was made with patches. this allows
git repositories to be cached for future re-builds.

with config/git/ gone, the download logic for projects
is more centrally implemented. a separate call to ./mk -f
is no longer performed, and in fact ./mk -f never needs
to be used anymore as a result. ./mk -f now is basically
the same thing as -b, just without any action performed.

this change will allow rapid expansion of the libreboot
project. i want to add hundreds of chromebooks to the
project, using mrchromebox, but the previous design did
not permit this. this change means that i can easily have
unlimited upstreams per project. coreboot will, in some
follow-up changes, have the following upstreams:

coreboot/default: coreboot.org
coreboot/fam15h: 15h.org fork
coreboot/chromebook: mrchromebox fork

this can now be done freely without massive changes to
the build system. under the previous design, i worked on
a now-abandoned patch to do N remotes per project, reading
repo links from a file. this meant that i'd have coreboot.org
first (main and backup), then mrchromebox. this meant that
lbmk would failover through to mrchromebox, wasting time
for the user.

this new design is much cleaner, and will enable the
project to be maintained much more easily.

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

i did: ./mk -u u-boot

otherwise, building u-boot asks for user input

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

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

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

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>