GNU bug report logs - #34902
Kernel module not found at boot time due to hyphen/underscore mismatch

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From: Julien Lepiller <julien <at> lepiller.eu>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 34902 <at> debbugs.gnu.org
Subject: bug#34902: guix cannot find a module on boot
Date: Mon, 18 Mar 2019 22:34:04 +0100

Le Mon, 18 Mar 2019 21:42:29 +0100,
Ludovic Courtès <ludo <at> gnu.org> a écrit :

> Hi Julien,
> 
> Julien Lepiller <julien <at> lepiller.eu> skribis:
> 
> > I've installed the Guix system on my cubietruck yesterday, but had
> > some difficulties. At first, the root partition was not available at
> > boot, so I got a repl with a message saying that /dev/mmcblk0p1 was
> > not available. I added the following to my guix config file:
> >
> > (initrd-modules (cons "sunxi_mmc" %base-initrd-modules))  
> 
> Didn’t ‘guix system init’ suggest adding this module?  Could it be
> that this module was actually built-in in the kernel you booted?

I couldn't find it in the output of lsmod, so I think it was builtin.

> 
> > although the guix system command worked, the produced system still
> > couldn't boot, but this time the message was that guix was unable to
> > find sunxi_mmc.ko. Using the repl I could confirm that this module
> > was indeed here, but under the name sunxi-mmc.ko. Using
> > load-linux-module*, I was able to confirm that loading it made the
> > filesystem available in /dev. In the end this line:
> >
> > (initrd-modules (cons "sunxi-mmc" %base-initrd-modules))
> >
> > was the right line to add, and I could properly boot my
> > cubietruck!  
> 
> Phewww.
> 
> > The bug here is that guix should either be smarter and load
> > sunxi-mmc.ko when it can't find sunxi_mmc.ko, or not allow me to
> > build a system when I specify sunxi_mmc since it doesn't exist at
> > boot time.  
> 
> This underscore vs. hyphen thing is terrible.
> 
> In commit fcd068e984078ab74c6842af2525bf88096cd262 we fixed the initrd
> builder so it would try both file underscore and hyphen.
> 
> But now I suppose we need to do the same in ‘load-linux-module*’?

I guess so :)

> 
> Thanks,
> Ludo’.

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