On 11 February 2014 19:15, Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote: >> >> To summarize, I think I have 3 options for partitioning (I am not >> considering UEFI secure boot or swap): >> 1) grub, BTRFS partition (i.e. full disk in BTRFS), /boot inside BTRFS subvolume > > This doesn't seem like a good idea for a boot drive to be without partitions. > > >> 2) grub, GPT partition, with (A) on sda1, and a BTRFS partition on >> sda2, /boot inside BTRFS subvolume >> 3) grub, GPT partition, with (A) on sda1, /boot (ext4) on sda2, and a >> BTRFS on sda3 >> >> (A) = BIOS Boot partition (1 MiB) or EFI System Partition (FAT32, 550MiB) >> >> I don't really see the point of having UEFI/ESP if I don't use other >> proprietary operating system, so I think I will go with (A) = BIOS >> Boot partition except if there is someting I have missed. > > You need to boot your system in UEFI and CSM-BIOS modes, and compare the dmesg for each. I'm finding it common the CSM limits power management, and relegates drives to IDE speeds rather than full SATA link speeds. Sometimes it's unavoidable to use the CSM if it has better overall behavior for your use case. I've found it to be lacking and have abandoned it. It's basically intended for booting Windows XP, right? > Ok based on your advices, here is what I have done so far to use UEFI (remeber that the objective is to have a clean and simple BTRFS RAID1 install). A) I start first with only one drive, I have gone with the following partition scheme (Debian wheezy, kernel 3.12, grub 2.00, GPT partition with parted): sda1 = 1MiB BIOS Boot partition (no FS, "set 1 bios_grub on" with parted to set the type) sda2 = 550 MiB EFI System Partition (FAT32, "toggle 2 boot" with parted to set the type), mounted on /boot/efi sda3 = 1 TiB root partition (BTRFS), mounted on / sda4 = 6 GiB swap partition (that way I should be able to be compatible with both CSM or UEFI) B) normal Debian installation on sdas, activate the CSM on the motherboard and reboot. C) apt-get install grub-efi-amd64 and grub-install /dev/sda And the problems begin: 1) grub-install doesn't give any error but using the --debug I can see that it is not using EFI. 2) Ok I force with grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=grub --recheck --debug /dev/sda 3) This time something is generated in /boot/efi: /boot/efi/EFI/grub/grubx64.efi 4) Copy the file /boot/efi/EFI/grub/grubx64.efi to /boot/efi/EFI/boot/bootx64.efi 5) Reboot and disable the CSM on the motherboard 6) No boot possible, I always go directly to the UEFI-BIOS I am currently stuck there. I read a lot of conflicting advises which doesn't work: - use "modprobe efivars" and efibootmgr: not possible because I have not booted in EFI (chicken-egg problem) - use update-grub or use grub-mkconfig (to generate /boot/efi/grub/grub.cfg): no results - other exotic commands... So I will try to upgrade to grub 2.02beta (as recommender by Chris Murphy) but I am not sure that it will help. If someone has some Debian experience on this UEFI install, please don't hesitate to propose solutions ! I will continue to document this "experience" (hope that it will be useful for others), and hope to get to the point where I can have a good system in BTRFS RAID1 mode. You have to be very motivated to get into this, It is really a challenge ! ;-) -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
