[yocto] Autoload kernel module works only once

[Andrea Laini]

Hi everybody,

I'm getting some errors after building my Linux distro with the use of KERNEL_MODULE_AUTOLOAD to allow autoloading 2 of my custom out-of-tree device at boot time. We've a Poky 1.7 version.

So, before building the new image with the Yocto keyword KERNEL_MODULE_AUTOLOAD, I was able to load and open (and, obviously, use) my devices simply by calling 'modprobe mydevice' after logging in. Restarting the board, everything was still working well.
Since I've rebuild a new image enabling module autoload at boot time, modules are always loaded, but I'm able to open (and use) them only really first time I switched on the board after downloading new image. After the first reboot, LKMs are still loaded (calling 'lsmod' show them) but I can't open them, neither from my C program nor reading/writing them from '/dev/mydevice'.

To me it sound a very strange behavior.

Hope anyone can help,
Many thanks

Andrea


Andrea Laini

Email: andrea.laini at claypaky.it<mailto:andrea.laini at claypaky.it>
_________________________________
Clay Paky S.p.A.
AN OSRAM BUSINESS
Via Pastrengo, 3/b - 24068 Seriate (BG) - ITALY
Phone: +39 - 035.654.311 - Fax: +39 - 035.30.18.76
Web: www.claypaky.it<http://www.claypaky.it/>
_________________________________
Read our Disclaimer @  www.claypaky.it/disclaimer<http://www.claypaky.it/disclaimer/index.html>


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.yoctoproject.org/pipermail/yocto/attachments/20170313/51fefc24/attachment.html>