Jessie live booting at 32 bit uefi PC ?

[Hyeonjin Oh]

Thanks a lot, Debian team.

I have a question below.

Is jessie live possible to boot at 32 bit uefi PC ? (Most tablet with baytrail CPU is only supporting 32 bit uefi boot)

[Thomas Schmitt]

Hi,

Hyeonjin Oh wrote:
> Is jessie live possible to boot at 32 bit uefi PC ?

Only via "legacy" BIOS emulation.

Inspection of
http://cdimage.debian.org/mirror/cdimage/archive/8.4.0-live/i386/iso-hybrid/debian-live-8.4.0-i386-standard.iso
shows that there are only boot entries which lure PC-BIOS:

- El Torito boot catalog with a single entry for platform "80x86"
(which means PC-BIOS). This is used by BIOS when booting from
optical media (CD, DVD, BD).

- Isohybrid MBR with a single partition starting at 512-block number 64
and not being of type 0xef. (I.e. it is not the EFI System Partition and
no valid GUID Partition Table is present.)
The MBR program code is used by BIOS when booting from USB stick,
memory card, or hard disk.

You could try whether a netinst ISO boots properly on your hardware:
http://cdimage.debian.org/debian-cd/8.5.0/i386/iso-cd/debian-8.5.0-i386-netinst.iso
and if so, ask at
debia...@lists.debian.org
to give LiveCD the same boot equipment as netinst has.

There seems to be work in progress
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=731709
So my advise is not to complain in any way but rather to offer yourself
as tester of newest development.


Have a nice day :)

Thomas

[Hyeonjin Oh]

Hi Thomas Schmitt, Thank you for fast feedback.

Have good day.

2016. 8. 31. 오후 3:58에 "Thomas Schmitt" <scdb...@gmx.net>님이 작성:

[Mark Fletcher]

On Wed, Aug 31, 2016 at 4:30 PM Hyeonjin Oh <nau...@gmail.com> wrote:

Hi Thomas Schmitt, Thank you for fast feedback.

Have good day.

I can confirm recent experience, live CD couldn't boot UEFI but netinst could. I used live CD to boot a new machine and build LFS until the grub installation stage, when I discovered I couldn't install grub in UEFI mode because none of the UEFI kernel "stuff" was available, so then I had to boot netinst in UEFI mode, do a minimal Debian install to another USB key, boot THAT, and use that to install grub on the disk of the machine concerned, so I could get it to boot UEFI without re-doing the entire installation of LFS. Live is great in all respects except that one.

I've got to think UEFI capability on the live images can't be far away, since the netinst can already do it, and the number of machines that need legacy boot is dwindling all the time (although still large, I'll warrant) and there's a disturbing trend of new machines coming out with no legacy compatibility mode.

Mark