Invalid module format

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Paul Beam

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Jun 4, 2021, 5:20:35 PMJun 4
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I'm trying to build a new driver for a Realtek 8821C for the PocketBeagle, and although I have managed to cross-compile the module, it fails to load with an "invalid format" error, which I think means it thinks I compiled with a different kernel version.  

My PB is still running "4.14-ti", and I downloaded Robert's "rt-4.14" branch onto my build machine thinking that "4.14" should be close enough.  Is my problem the "ti" branch vs the "rt" branch?  I guess I can build it on the PB if I have to, but it is much faster to build on my desktop and, theoretically, easier to keep track of.

Robert Nelson

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Jun 4, 2021, 5:22:23 PMJun 4
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On Fri, Jun 4, 2021 at 4:20 PM Paul Beam <rpau...@gmail.com> wrote:
>
> I'm trying to build a new driver for a Realtek 8821C for the PocketBeagle, and although I have managed to cross-compile the module, it fails to load with an "invalid format" error, which I think means it thinks I compiled with a different kernel version.
>
> My PB is still running "4.14-ti", and I downloaded Robert's "rt-4.14" branch onto my build machine thinking that "4.14" should be close enough. Is my problem the "ti" branch vs the "rt" branch? I guess I can build it on the PB if I have to, but it is much faster to build on my desktop and, theoretically, easier to keep track of.

sudo apt install linux-headers-`uname -r`

Regards,

--
Robert Nelson
https://rcn-ee.com/

Paul Beam

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Jun 7, 2021, 9:23:48 AMJun 7
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Thanks, Robert.  That would work if I were compiling on the PB, but cross-compiling on my Debian VM was different.  There may be an easier way, but what I did was follow this: http://phwl.org/2021/building-bbg-kernel/   to checkout the exact kernel I have on my PB, compile it, and then point my driver Makefile to this directory.  This at least appears to work.

Robert Nelson

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Jun 7, 2021, 9:41:37 AMJun 7
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On Mon, Jun 7, 2021 at 8:23 AM Paul Beam <rpau...@gmail.com> wrote:
>
> Thanks, Robert. That would work if I were compiling on the PB, but cross-compiling on my Debian VM was different. There may be an easier way, but what I did was follow this: http://phwl.org/2021/building-bbg-kernel/ to checkout the exact kernel I have on my PB, compile it, and then point my driver Makefile to this directory. This at least appears to work.

Okay, that would also work..
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