Updating boot support partitions as required

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EFI BIOSes will use /boot/vmlinuz from the target rootfs.Chrome OS BIOS uses the signed kernel embedded in its own partition.Note that different EFI BIOSes may have different requirements for the pathname of the bootloader.Most EFI BIOSes contain a "Compatibility Support Module" component which makes them act like legacy BIOSes, so they may boot either way.EFI BIOS boots like this: The Chromium OS build process creates an EFI System Partition (partition 12) and installs a 64-bit version of grub2 as the bootloader (/efi/boot/bootx64.efi), along with its config file (/efi/boot/grub.cfg). It is possible to also install a 32-bit bootloader in the same partition, but we currently do not do that.To change the boot partition, we just need to edit the file.They are signed with test keys that are found in the source tree.Official releases will of course be signed with private Google keys.

Both ARM and (recent) x86 devices use U-Boot as their bootloader.U-Boot still uses the EFI partition table described below.Legacy boot for x86 Linux has three steps: Legacy BIOSes will continue to boot Chromium OS from the MBR.Our build and update process is carefully crafted to try to keep all three of these kernels in sync.However, if you're fiddling with the kernel and commandline, you may find that your changes are being ignored.

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