From: Brian Norris <computersforpe...@gmail.com> 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 <computersforpe...@gmail.com> (cherry picked from commit 17b05045bd82f04a8839666ec0fe43a5041d77c7) Signed-off-by: Jan-Niklas Burfeind <g...@aiyionpri.me> --- Good afternoon everyone. This series intends to support Google WiFi device 'Gale'. I think I found all relevant commits and testing looked promising. Feedback is highly appreciated; I realize these are a lot commits but as most of them is pretty isolated from other devices and even subtargets, this might be just fine? Anyway. Have a nice weekend, Aiyion .../base-files/files/lib/upgrade/common.sh | 4 +++- target/linux/ipq40xx/image/chromium.mk | 22 +++++++++++++++++++ 2 files changed, 25 insertions(+), 1 deletion(-) create mode 100644 target/linux/ipq40xx/image/chromium.mk diff --git a/package/base-files/files/lib/upgrade/common.sh b/package/base-files/files/lib/upgrade/common.sh index 24ff77a8b3..5af061f6a4 100644 --- a/package/base-files/files/lib/upgrade/common.sh +++ b/package/base-files/files/lib/upgrade/common.sh @@ -155,9 +155,11 @@ export_bootdevice() { fi done ;; + PARTUUID=????????-????-????-????-??????????0?/PARTNROFF=1 | \ PARTUUID=????????-????-????-????-??????????02) uuid="${rootpart#PARTUUID=}" - uuid="${uuid%02}00" + uuid="${uuid%/PARTNROFF=1}" + uuid="${uuid%0?}00" for disk in $(find /dev -type b); do set -- $(dd if=$disk bs=1 skip=568 count=16 2>/dev/null | hexdump -v -e '8/1 "%02x "" "2/1 "%02x""-"6/1 "%02x"') if [ "$4$3$2$1-$6$5-$8$7-$9" = "$uuid" ]; then 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 -- 2.40.0 _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel
