19.12.2015 18:53, Thomas Schmitt пишет: > Hi, > > Alexander E. Patrakov wrote: >> [resending after the rejection, now I am subscribed to both lists] > > Hm. I got your first reply to Andrei and bug-xorriso after > i freed it from the bug-xorriso list jail. > Andrei's was on hold too. > Hopefully i now exempted both of you from moderator review. > > ... ah yes. My first mail got rejected by bug-grub(-owner)@gnu.org > I hope bug-xorriso is more friendly to newcomers. > (I have subscribed to bug-grub now and resend.) > > >> So here is an alternative proposal. I was able to fix up the iso by creating >> a second partition of the same geometry, of type 0, and with bootable flag >> on. > > I am not sure whether this is generally better from the view > of EFI. > Either we shall have MBR partitioning with possibly a 0xef > partition, or we shall have GPT with only one protective > partition 0xee in the MBR. > > >> 1. The partition with type 0xee should start at sector 1 and be >> non-bootable, otherwise the GPT is treated as invalid. >> 2. There should be no overlap between partitions of type != 0. >> 3. There should be a bootable partition in the MBR. > > I currently try to talk Debian out of nesting partitions, > even id the big one is type 0x00. > My proposal is rather to avoid GPT and to use the EFI option to > partition by a conventional MBR partition table.
a) are we sure every EFI system out there accepts MBR (Apple?) b) GPT has nice feature of self-identifying block size. This allows grub rescue CD to access GPT partitions both in HDD mode (with 512B blocks) and CD mode (with 2K blocks). I am not sure how it important it is though. GRUB itself does not really need access to underlying ESP; but there were several requests to support it. > That would also make possible to have the first partition mountable. > > The price would be (currently): > - The EFI system partion has to exist twice. Once as file in the > ISO to be usable as El Torito boot image. Once after the ISO, > so that ISO partition and EFI system partition do not overlap. > - The EFI system partition would not be covered by the ISO size. > Some scripts which checkread after copying might only read > that amount of bytes and report mismatch. > > > Have a nice day :) > > Thomas > > > _______________________________________________ > Bug-grub mailing list > Bug-grub@gnu.org > https://lists.gnu.org/mailman/listinfo/bug-grub > _______________________________________________ Bug-grub mailing list Bug-grub@gnu.org https://lists.gnu.org/mailman/listinfo/bug-grub
