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.
commit fa3da49c84 "coreboot: update
patch to add master header in both images" still isn't causing
coreboot to put a master header into the NORMAL region. As a
result, images built after that commit but before this one will
always use the FALLBACK region.
This commit adds the master header explicitly, since I still can't
seem to get coreboot to do that on its own.
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`.
Adam Joseph