Emmanuel Dreyfus <m...@netbsd.org> wrote: > I try to boot NetBSD/Xen from a GPT, with little success. > > I understand NetBSD EFI bootstrap does not support multiboot, so I > should use BIOS boot.
That poins seems false, I found multiboot code in EFI boot after all. I made some progress: it seems the BIOS/UEFI has real trouble with the GPT. Creating a MBR partition overlapping with the PMBR helps a lot: Partition table: 0: GPT Protective MBR (sysid 238) start 1, size 4294967295 (2097152 MB, Cyls 0-267349/89/4) PBR is not bootable: Bad magic number (0x0000) 1: EFI system partition (sysid 239) start 34, size 524288 (256 MB, Cyls 0/0/35-32/162/36), Active 2: <UNUSED> 3: <UNUSED> I did it this way to keep the GPT intact: dd if=/dev/rwd0d bs=512 count=1 > mbr fdisk -IafFu1 -s 239/34/524288 mbr dd if=mbr of=/dev/rwd0d bs=512 count=1 The EFI partition was formatted using newfs_msdos -F 16 -L efi@wd0 -B /usr/mdec/bootxx_fat16 /dev/rdk0 It contains: /boot /boot.cfg /efi/boot/bootx64.efi Now the BIOS accepts booting that either in legacy or UEFI mode. However I face two problems: - In legacy mode, bootstrap displays two lines of blank (rendered as underscore on the serial line), then nothing. I tried FAT 12 with bootxx_fat12 with the same result. - in UEFI mode, bootstrap does not read boot.cfg and while it sees the GPT partitions, it is unable to access a RAID that has a GPT inside. It can access a RAID that has a disklabel inside, though, but that does not help for > 2 TB. disk hd0 mediaId 0 size 5589 GB hd0a(EFI System) hd0b(NetBSD RAID) hd0c(NetBSD Swap) -- Emmanuel Dreyfus http://hcpnet.free.fr/pubz m...@netbsd.org