Most importantly this should fix issues with rp2350 boards
not synchronizing properly.

Signed-off-by: Riku Viitanen <riku.viitanen@protonmail.com>

We were previously not handling picotool at all, and
pico-sdk would download picotool itself, at build time.

This means that the source archive, if created, would
not contain picotool. While not strictly required, for
complete corresponding source, since it's a toolchain
and not the actual pico-serprog firmware, it is my policy
that releases must include full corresponding source code,
when it is feasible to do so.

I must say, I intensely dislike cmake, with such burning
passion; I am thoroughly displeased by how hacky this is,
but it works and now nothing is in my way for a Libreboot
20241206 rev8 release!

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

this brings support for a new microcontroller platform rp2530.

total number of pico boards supported now: 97

TEST: built them all

Tested-by: Riku Viitanen <riku.viitanen@protonmail.com>
Signed-off-by: Riku Viitanen <riku.viitanen@protonmail.com>

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

replace it with logic that simply uses "." to load
files directly. for this, "vcfg" is added as a variable
in coreboot target.cfg files, referring to a directory
in config/vendor/ containing a file named pkg.cfg, and
this file then contains the same variables as the
erstwhile config/vendor/sources

config/git files are now directories, also containing
pkg.cfg files each with the same variables as before,
such as repository link and commit hash

this change results in a noticeable reduction in code
complexity within the build system.

unified reading of config files: new function setcfg()
added to lib.sh

setcfg checks if a config exists. if a 2nd argument is
passed, it is used as a return value for eval, otherwise
a string calling err is passed. setcfg output is passed
through eval, to set strings based on config; eval must
be used, so that the variables are set within the same
scope, otherwise they'd be set within setcfg which could
lead to some whacky results.

there's still a bit more more to do, but this single change
results in a substantial reduction in code complexity.

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

don't define it as a "depend" variable in config/git/,
because it means putting the files in a subdirectory of
an existing project was was already then downloaded, and
that means it can't be downloaded first; if the download
of it fails, the old download is left intact.

this bug isn't currently fixed in the build system, at all,
so this and other patches are being made to mitigate it.

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

this brings the handling of serprog projects in sync
with canoeboot, which relies on the "depend" variable
to get the needed submodules, because cbmk does not
download submodules for these projects

lbmk does download submodules. i want it in sync with
cbmk for this, to make merging easier between both
projects, because i'm going to make a change on both
projects, whereby config/submodules/ is used exclusively

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

this merges the fix from:
https://codeberg.org/libreboot/pico-serprog/pulls/1

however, PRs are not to be sent there. riku merged it in
his repository, and i pulled it in the mirror hosted
on libreboot codeberg

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

should fix https://codeberg.org/libreboot/lbmk/issues/182

Signed-off-by: Riku Viitanen <riku.viitanen@protonmail.com>

Riku introduced three new patches:

* Add support for multiple chip selects. This allows you to
  control multiple chips from the same clip, on systems with
  dual flash setups, at least theoretically.
* Enable pull-up on unused chip selects - pull them high so
  that chips you connect that to are deactivated while flashing
  the target chip. This could be used on thinkpad W541 for
  instance, where miso/mosi have 0ohm between them via the two
  flash ICs. You could pull the other chip select high.
* Documentation for the above, in the pico-serprog readme.

This goes in tandem with a patch from Riku, present in the
recently integrated flashprog project, namely:

commit ddb6d926783d4f9cbee04c7392718ed8f89daa0e
Author: Riku Viitanen <riku.viitanen@protonmail.com>
Date:   Mon Jan 15 19:15:49 2024 +0200

    serprog: Add support for multiple SPI chip selects

This functionality will therefore be present in the next
release of Libreboot.

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