Prior to this commit, ownerboot had quite a lot of "magic addresses"
and flash chip layouts. This commit eliminates all of them.
All flash chip geometry is now computed from first principles and
two parameters:
1. The flash chip size
2. The number of images per chip (two means NORMAL/FALLBACK)
If (flash-chip-size / num-images) is too small, coreboot's build
process will notice this and fail.
It should be possible to build a single-image (i.e. no FALLBACK)
ownerboot for use on 8mbyte flash chips, which lets people try this
out without having to buy a new flash chip or (in the case of the
rk3399-gru-kevin laptop) doing any soldering.
Previously ownerboot had separate `userspace` (the initramfs
contents without kernel modules) and `initramfs` (the complete
initramfs) expressions. This was done in order to allow the use of
CONFIG_INITRAMFS_SOURCE, which links an initramfs image into the
kernel itself.
I did this because I was having a hard time getting coreboot to load
a separate initrd on rk3399. I have since solved that problem, and
am now using coreboot to load an initramfs on all platforms. There
is no longer any need for this unusual separation.
This commit causes the coreboot payload (i.e. the Linux kernel,
initramfs, and any necessary DTBs) to be inserted into the coreboot
image as part of a separate derivation from the one which compiles
coreboot.
As a result, changing the contents of the initramfs is extremely
fast -- it can now be done without any recompilation.
As a result of this, the attribute name for the final image to be
flashed has changed from `coreboot` to `image`. The `coreboot`
attribute now builds a payloadless `coreboot.rom`.
This commit adds several useful scripts (alongside the coreboot
image) in a `main` expression, which should be the primary build
expression going forward.
The following scripts should exists on all platforms:
- flashrom wrappers:
- `flashrom.sh`
- `flash-write-all.sh`
- `flash-write-fallback.sh`
- `flash-write-normal.sh`
- scripts to select which image (normal or fallback) is used for the
next boot:
- `nextboot-show.sh`
- `nextboot-use-fallback.sh`
- `nextboot-use-normal.sh`
- a script to write an image to the em100 flash-chip-emulator device:
- `em100-write.sh`
This commit generalizes the selection and activation of the serial
console by promoting it to a top-level package-set member.
The top-level package set is starting to attract clutter, so I will
soon be moving all the non-package constitutents into a `config`
attrset.
This commit makes `hostPlatform` part of the packageset for more
consistent handling. A top-level `hostPlatform` argument is exposed
to the caller, in case they want to customize the `hostPlatform`
(compiler flags, etc).
The `hostPlatform` argument is inherited into the ownerboot package
set, where it will be overridden by `src/platform/*.nix` if it has
not been set explicitly.
Making `hostPlatform` part of the package set allows for more
sophisticated overriding schemes, for example adding additional
compiler flags or sanity-checking the flags that the user has
provided.
Since we (unfortunately) need to use different forks of flashrom for
different platforms, flashrom must be overrideable. Moving it into
the ownerboot packageset is the way to do that.
Adam Joseph