blspec

[Ahmad Fatoum]

Hello,

On 4/13/26 21:15, Alexander Shiyan wrote:
> Hello Ahmad.
> 
> Is it possible to implement a similar provider that parses extlinux.conf
> (i.e. finds DEFAULT, reads the corresponding LABEL section, extracts
> KERNEL, INITRD, APPEND) and creates boot records based on it?

Sure, you can implement a custom `struct bootscanner` and do whatever
you like.

We already have a driver handling the U-Boot environment, so I don't see
why an optional extlinux.conf parser shouldn't be appropriate for upstream
if someone contributes it.

Cheers,
Ahmad

> 
> Thanks!
> 
> пн, 13 апр. 2026 г. в 17:01, Ahmad Fatoum <a.fatoum at pengutronix.de>:
>>
>> Hello Alexander,
>>
>> On 4/10/26 4:02 PM, Alexander Shiyan wrote:
>>> Hello All.
>>>
>>> Can anyone explain how to use the built-in blspec support?
>>> I would like to try setting up booting via exlinux.conf...
>>
>> exlinux.conf and bootloader spec are different formats.
>>
>> Here's a bootloader spec example:
>>
>>   $ cat /loader/entries/imx8mp-evk.conf
>>   title           PTXdist - Pengutronix-DistroKit imx8mp-evk
>>   version         6.18
>>   options         rootwait
>>   linux           /boot/Image
>>   devicetree      /boot/imx8mp-evk.dtb
>>   linux-appendroot        true
>>
>>
>> You can have multiple files under /loader/entries and barebox will
>> iterate over them, extract the compatible of the referenced devicetree,
>> compare it against its own and then decide what to boot.
>>
>> The linux-appendroot key is barebox-specific and means barebox should
>> fixup root= according to the device it found the bootloader spec file
>> on. This is useful for the case where the bootloader spec files are
>> directly in the rootfs and not in a separate partition.
>>
>> Cheers,
>> Ahmad
>>
>>
>>
>>>
>>> Thanks!
>>>
>>>
>>
>> --
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>>
> 


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