Re: Video Error Reasons?

Philipp Eppelt <[email protected]> Tue, 26 Nov 2024 12:36:15 +0100
Newsgroups	gmane.comp.micro-kernel.l4.devel
Message-ID	<[email protected]>
Hi Lonnie,

I asked around what leads to this behavior and if there is a workaround.

The string is emitted from grub and is usually printed on UEFI systems, because 
there is no VESA BIOS anymore. There might still be  a 'CSM Support' option in 
your UEFI to enable the legacy BIOS compatibility again.

The framebuffer example depends on the VESA BIOS as well.

The 'bunch of lines' are likely related to the IOMMU being enabled.

Cheers,
Philipp

Am 14.11.24 um 00:07 schrieb Lonnie Cumberland via l4-hackers:
> Hello All,
> 
> I have been experimenting with L4Re and was able to compile the latest snapshot 
> that seems to work well for almost all of the examples in QEMU from the "make 
> qemu" menu which is a very good start, I think.
> 
> Lately, I have also used the "make grub2iso" which gives me the same menu of 
> examples as the "make qemu" but for which it will generate an ISO of the example.
> 
> I generated ISO's for all of the examples and tested them on 3 different x64 
> computer systems which are all Intel with 2 being NUC's and 1 being a Dell XPS 
> 8950 but when I boot any of the generated L4Re ISO's, it seems to boot all of 
> the core modules but then gets to an error message that seems to be related to 
> the video mode.
> 
> -------------------------------------------
> error: no suitable video mode found
> -------------------------------------------
> 
> And then the screen shows a bunch of lines.
> 
> I have been looking around though the L4Re code in the snapshot release, but I 
> do not yet have a clue where how to change things so that these ISO's will boot 
> completely on some hardware although things seem to boot up in QEMU.
> 
> I am thinking that there might just be some setting somewhere that I need to 
> adjust, or something.
> 
> Any thoughts, suggestions, or ideas would be greatly appreciated.
> 
> Have a great evening,
> Lonnie
> 
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