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| author | Brian Norris <computersforpeace@gmail.com> | 2020-06-13 20:12:18 -0700 |
|---|---|---|
| committer | Christian Lamparter <chunkeey@gmail.com> | 2022-03-25 18:14:13 +0100 |
| commit | 17b05045bd82f04a8839666ec0fe43a5041d77c7 (patch) | |
| tree | c16982951aa1c85653ffcb6c40b1097d2af5a691 /target/linux/ipq40xx | |
| parent | 331d78a90f3f11e9abfbc114a601c565899e3764 (diff) | |
| download | upstream-17b05045bd82f04a8839666ec0fe43a5041d77c7.tar.gz upstream-17b05045bd82f04a8839666ec0fe43a5041d77c7.tar.bz2 upstream-17b05045bd82f04a8839666ec0fe43a5041d77c7.zip | |
ipq40xx: Support Chromium OS image-type creation
See firmware-utils.git commits [1], which implemented the cros-vbutil
verified-boot payload-packing tool, and extended ptgen for the CrOS
kernel partition type. With these, it's now possible to package kernel +
rootfs to make disk images that can boot a Chrome OS-based system (e.g.,
Chromebooks, or even a few AP models).
Regarding PARTUUID= changes: Chromium bootloaders work well with a
partition number offset (i.e., relative to the kernel partition), so
we'll be using a slightly different root UUID line.
NB: I've made this support specific to ip40xx for now, because I only
plan to support an IPQ4019-based AP that uses a Chromium-based
bootloader, but this image format can be used for essentially any
Chromebook, as well as the Google OnHub, a prior Chromium-based AP using
an IPQ8064 chipset.
[1]
ptgen: add Chromium OS kernel partition support
https://git.openwrt.org/?p=project/firmware-utils.git;a=commit;h=6c95945b5de973026dc6f52eb088d0943efa96bb
cros-vbutil: add Chrome OS vboot kernel-signing utility
https://git.openwrt.org/?p=project/firmware-utils.git;a=commit;h=8e7274e02fdc6f2cb61b415d6e5b2e1c7e977aa1
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'target/linux/ipq40xx')
| -rw-r--r-- | target/linux/ipq40xx/image/chromium.mk | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/target/linux/ipq40xx/image/chromium.mk b/target/linux/ipq40xx/image/chromium.mk new file mode 100644 index 0000000000..15d4c1a077 --- /dev/null +++ b/target/linux/ipq40xx/image/chromium.mk @@ -0,0 +1,22 @@ +define Build/cros-gpt + cp $@ $@.tmp 2>/dev/null || true + ptgen -o $@.tmp -g \ + -T cros_kernel -N kernel -p $(CONFIG_TARGET_KERNEL_PARTSIZE)m \ + -N rootfs -p $(CONFIG_TARGET_ROOTFS_PARTSIZE)m + cat $@.tmp >> $@ + rm $@.tmp +endef + +define Build/append-kernel-part + dd if=$(IMAGE_KERNEL) bs=$(CONFIG_TARGET_KERNEL_PARTSIZE)M conv=sync >> $@ +endef + +# NB: Chrome OS bootloaders replace the '%U' in command lines with the UUID of +# the kernel partition it chooses to boot from. This gives a flexible way to +# consistently build and sign kernels that always use the subsequent +# (PARTNROFF=1) partition as their rootfs. +define Build/cros-vboot + $(STAGING_DIR_HOST)/bin/cros-vbutil \ + -k $@ -c "root=PARTUUID=%U/PARTNROFF=1" -o $@.new + @mv $@.new $@ +endef |