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9199653
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(Get the code!)
>> Do you remember which choice you chose at this screen ( http://
I have performed manual partition of disk.
I do NOT tring to create dualboot - so it is not like Bug #1050940 .
The only I want is to load Ubuntu on GPT partition in legacy mode.
I have set of problems with it which I identify as limitations (bugs?) in GRUB2 and kernel:
1. ( in grub-install) Grub2 refuse to "grub-install /dev/sda" if protective GPT entry is NOT the first.
This bug could be workarounded with method described in bug 2.
2. ( in grub booting - core.img? )I could do grub-install IF protective GPT entry is the first, and to rearainge order of records in MBR so it become not first - but in this case GRUB failed to detect GPT during booting.
During boot shown:
error: no such partition
grub rescue> ls
(hd0)
3. ( in grub-install) IF I do protective record start from sector 2048 - then I could install GRUB in "biosdisk" (?) mode but in this case it installed it data (102 sectors) starting from sector 1 and so corrupt GPT header. I assume that is stage1.5/core.img data ?
4. ( in kernel?) with setup when GPT protective record is NOT first and starts from sector 2048 kernel not able recognise hybrid partition table. in dmesg I see:
[sda]: unknown partition table
same time gdisk sees correct GPT and hybrid MBR
Most correct approach - will be to resolve bug 2. But guess that reqires re-working ASM code.
For now I am trying diferent approach - boot core.img in biosdisk mode and then load correct module (part_gpt) through (hd0,msdos2) and then perform father actions through (hd0,gptN).
For that I need to find way to force GRUB install it stage1.5 not to sector 1 (resolve bug 3) .
I guess for that needed to tweak (or hack) boot.img to point it to new place of core.img
I could easily migrate stage1.5/core.img to diferent place with "dd" - but I do not know how point that place for stage1/boot.img
I see that size of stage1.5 is 51kB(102 sectors) so if I place it starting from sector 1901 it will be good enough. Another option is to use partition gpt12 (EF02) but then either grub must recognise GPT partition table (see bug 2) or point for stage 1 it location in biosdisk mode.