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[bug#26339] "extlinux", "extlinux" gpt, bootloader-configuration without

From: Danny Milosavljevic
Subject: [bug#26339] "extlinux", "extlinux" gpt, bootloader-configuration without package nor installer
Date: Tue, 13 Jun 2017 07:07:11 +0200

Hi Ludo,

On Mon, 12 Jun 2017 22:20:54 +0200
address@hidden (Ludovic Courtès) wrote:

> If “extlinux” is just the name of the configuration file format, 

It depends.

Syslinux-the-website thinks extlinux is the entire bootloader.

And which is a tracking 
page for adding support for extlinux.conf to u-boot (back then) says "syslinux 
style configuration files".

So we can also keep it as Mathieu intended and just overwrite the installer for 
u-boot.  Looks good to me.

>Given that the configuration file syntax is similar but presumably not 
>identical (?) 

u-boot doesn't support the entire format.  For example it can't currently do 
submenus.  But the idea with the above Fedora change was to use the same 
extlinux.conf for ARM and x86_64.  No idea whether they are actually using a 
subset still.

>and that it’s fairly simple, it may be best to simply have
>both ‘extlinux-configuration-file’ and ‘u-boot-configuration-file’.
>It’s a case where factorization is probably a bad idea.

After looking into it some more, I'm fine with any of the ways to proceed and 
defer the decision to Mathieu.

At first I thought it would be clearer if we had the extlinux.conf file writer 
common (also PXEboot and other things use it in the wild) - but it's not that 
bad to duplicated it.  Maybe a little opaque and the different writers would 
probably diverge on accident as we added features - but if we were careful it 
would be OK.

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