Out of interest I've just read the above page in the book. I *don't* use an initramfs, but I do have a rootfs mounted on a btrfs subvolume (similar in some ways to LVM). I have a GPT boot partition formatted with ext2 on a USB flash drive, and I'm using syslinux as a boot loader.
In case others are looking to boot a rootfs on a btrfs subvolume I just thought that I should report here that it is possible to do this *without* an initramfs. Richard
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