osboot is now part of libreboot, and will soon shut down.
libreboot now conforms to osboot policy.

In recent coreboot versions, running distclean started to erase the
cbfstool binary we built earlier in the util/cbfstool dir via the
cbutils build script call. The coreboot build puts it in a different
directory, and the roms build script can't find it when trying to add
payloads to the roms. This doesn't make the script fail (because set -e
is stupid like that), and the build appears to succeed if you don't look
close enough to see the "cbfsutil not found" error.

Build the coreboot utils we want at the places we want them after
calling distclean, so that we can actually use cbfsutil and avoid
silently-broken roms with newer coreboot versions.

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

This enables embedding U-Boot into the coreboot roms as the payload. For
now, the ELF file generated by enabling CONFIG_REMAKE_ELF is used, which
includes the U-Boot binary and the board-specific device-tree file. It
might be better to use the FIT payload support for U-Boot, but that was
reportedly broken and is not tested yet.

Coreboot boards can specify payload_uboot="y" in their board.cfg to
enable building a rom with U-Boot as the payload, which is built from
the U-Boot board with the same name. Boards can further specify a
uboot_config option, to choose which board-specific config file U-Boot
should be built with.

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

The 32-bit ARM cross compiler toolchain is used to build parts of
arm-trusted-firmware needed by AArch64 boards, compile the toolchain for
those boards as well.

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

The code that compiles coreboot crossgcc changes the working directory
to the coreboot directory, and the following code cannot find the lbmk
scripts that it needs to run. Compile ARMv7 and AArch64 cross compilers
in a subshell like in the x86 case so the rest of the script can work.

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

This enables building U-Boot for boards which have config files in
resources/u-boot, and copying built files that could be usable to make
coreboot payloads. Right now, there is no such board in this repo.

The most important file here is "u-boot.elf", which is a combination of
the U-Boot binary and the appropriate device-tree file for the board.
Building this needs CONFIG_REMAKE_ELF=y on the U-Boot part, and using
this with CONFIG_PAYLOAD_ELF=y on the coreboot build works fine.

Note that this isn't enough to make U-Boot-only releases, since
low-level prerequisites like arm-trusted-firmware aren't passed in to
the U-Boot build system. Coreboot builds its own copy of TF-A and sets
it up on the board, so using these U-Boot builds as payloads should
still work.

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

Add a 'v2022.07' pseudo-board for the U-Boot download script with the
default blobs list, and mark the version as supported in u-boot-libre
release script.

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

The U-Boot download script is designed to help with releasing
u-boot-libre and it can only prepare a generic U-Boot v2021.07 tree.
However, we will need to build board-specific versions of U-Boot to be
able to use it as a coreboot payload effectively.

As a first step toward that, make the download script prepare per-board
copies of U-Boot v2021.07. Then, add a 'v2021.07' pseudo-board for the
u-boot-libre release script to work on.

The u-boot-libre deblob script hash ends up chaning due to copying my
author attribution from the download script, update its hash.

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

The u-boot-libre tarball contents' mtimes are an unconventional value
due to timezone confusion. For reproducibility, timestamps like these
are usually set by a SOURCE_DATE_EPOCH which is respected by both
coreboot and U-Boot. Use it in the u-boot-libre release script as well,
and properly set the mtimes to the Unix epoch when it's not defined.

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

The u-boot-libre release script copies the blobs list into the release
as the deblob script, presumably due to a copy-paste error. Fix it to
correctly copy the generated deblob script.

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