Re: [RFC] grub-install: allow none or multiple install devices on PC BIOS

[Andrei Borzenkov <arvidjaar@gmail.com>]

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16.02.2016 07:11, Michael Chang пишет:
> On Sat, Feb 13, 2016 at 10:29:58AM +0300, Andrei Borzenkov wrote:
>> 12.05.2015 18:22, Michael Chang пишет:
>>> On Tue, May 12, 2015 at 02:57:00PM +0300, Andrei Borzenkov wrote:
>>>> В Tue, 12 May 2015 18:52:22 +0800
>>>> Michael Chang <mchang@suse.com> пишет:
>>>>
>>>>> On Fri, May 08, 2015 at 09:53:41PM +0300, Andrei Borzenkov wrote:
>>>>>> There are two main applications.
>>>>>>
>>>>>> 1. Omit install device to create generic image intended for chainloading
>>>>>> from other master loader. Such image can be put on any device (or file
>>>>>> system) and will still be able to find its $root. Currently even with
>>>>>> --no-bootsector grub-install optimizes image by skipping UUID search if
>>>>>> possible.
>>>>>>
>>>>
>>>> Actually I think it is useful for all platforms.
>>>
>>> As it works across all platform, os-prober should consider chanloading
>>> core images if possible rather than digging into grub configs. Is there
>>> any plan for that ?
>>>
>>
>> At least on EFI it is not possible to chainload GRUB from /boot until it
> 
> I'm skeptical to this. From what I know it's possible because grub's efi
> chainloader reads efi image via it's own filesystem support, so that it
> did not limited by what firmware could offer. And LoadImage can accept
> SourceBuffer as an option to pass the pointer of loaded image buffer
> directly.
> 
> Honestly I didn't really test it, but glancing at the source code it
> sounds promoising to work to me.
> 

Yes, indeed. I'm not sure what went wrong last time I tried it; I had
problem with device path.

Still, this is core.img vs. core.elf, which means it is platform dependent.


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