>>>>>> ..there is no error message, uefi boot works fine, but legacy bios >>>>>> boot fails with an "invalid partition table" error >>>>>> >>>>> Where this error comes from? I do not see this string in GRUB >>>>> sources and it really does not care; it would stop in rescue mode >>>>> then >>>>> >>>> I guess the error message comes from the machine's bios - the legacy boot >>>> doesn't get as far as starting grub. >>>> >>>>> Recently someone reported problem with booting rescue image on >>>>> legacy BIOS >>>>> - it would refuse to consider medium bootable unless medium has >>>>> *msdos* partition table with active partition. This sounds like it could >>>>> be the reason. >>>>> >>>> I'm not sure I understand - I thought the "EF02 BIOS boot partition" >>>> achieved this aim? >>>> >>> >>>BIOS boot is still GPT partition. >>> >>>> If not, what would the gpt partition table above look like including an >>>> *msdos* partition table with active partition? >>>> >>> >>> You can start with creating standard MSDOS partition table. >>> >>> EFI should be able to boot from it as well; and there is MSDOS partition >>> type reserved for ESP (0xef). >>> Install grub in MBR. If booting still fails, try to mark second partition >>> bootable. >>> >> Thanks, this works: >> >>$ sudo fdisk /dev/sdc >> ... >> Device Boot Start End Blocks Id System >> /dev/sdc1 * 2 128 1020127+ ef EFI (FAT-12/16/32) >> >Could you do me a favor and test if it also still works without any active >partition? > Yes, it works without an active partition
>> /dev/sdc2 129 3797 29471242+ 83 Linux >> ... >> $ sudo x86_64-grub-install --target=x86_64-efi >> --boot-directory=/mnt/sdc1/EFI/BOOT --efi-directory=/mnt/sdc1 --removable >> Installation finished. No error reported. >> >> $ sudo x86_64-grub-install --target=i386-pc >> --boot-directory=/mnt/sdc1/EFI/BOOT /dev/sdc Installation finished. No error >> reported. >> >> > Hmm ... are sizes above in cylinders? > Yes, 129 and 3797 are sizes in cylinders. >> ..and both legacy-bios and uefi boot work. >> Affirmative :) _______________________________________________ Help-grub mailing list [email protected] https://lists.gnu.org/mailman/listinfo/help-grub
