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Re: [PATCH v2 08/12] kern: Make grub_error() more verbose

From: Bruce Dubbs
Subject: Re: [PATCH v2 08/12] kern: Make grub_error() more verbose
Date: Fri, 6 Mar 2020 11:12:14 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0

On 3/6/20 11:03 AM, David Michael wrote:
On Fri, Mar 6, 2020 at 9:02 AM Didier Spaier <address@hidden> wrote:
Le 06/03/2020 à 13:43, Daniel Kiper a écrit :
If we go that way then we have to care about them by the end of the
universe. And this means more and more issues like [1]. If somebody
wants to use new GRUB then he/she have to reinstall the machine or
something like that. IMO we should not care about users who do not want
upgrade their machines or whatnot. Or at least their choices cannot
impact GRUB development too much. And I think that this MBR constraint
is hindering the project too much at this point. So, as above...

Sorry for being blunt...

Sorry to be off topic... In case of a GUID partition table, if I
understand the UEFI specification[1], as the first usable LBA should be
greater than or equal to 34 for a 512 bytes block size or 6 for a
4096 bytes logical block size, it could begin after a gap of 24K.

Then, if we assume that the first partition begins @ 1MiB, can't GRUB
use the space unused between the first usable LBA and 1MiB instead of
a Bios Boot partition, in case of "legacy" booting and a GPT? I ask as
then a Bios Boot partition wouldn't be necessary any more.

It would be best to use a boot partition so the core.img space is
reserved by the GPT,

Just a terminology issue here. Please don't call it a boot partition. It conflicts with those who mount /boot as a separate partition. Please call it a grub partition.

  -- Bruce

but I once wanted to tack i386-pc GRUB onto an
existing UEFI GPT disk, so I wrote the commands that do what you're
describing here:

I may be misremembering, but I think the core.img size was limited to
around half a megabyte, so it should be safe to write it to the unused
~1MiB before the first partition after the GPT.  But yes, using the
boot partition would probably be for the best if you are formatting a
new disk.



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