After hours of reading all sorts and my brain blowing up, I think I might have found the reason for the problem. However, as a Linux noob, I am now stuck and hope one of our gurus will shed light on this.
This is where I am now: 1. Copied the "start" section of sgx-startup.sh to a new file and started fiddling. 2. Found that there appears to be some delay between modprobe pvrsrvkm , deleting the /dev/pvrsrvkm file and what I assume is the kernel module setting permissions on the file. 3. When I moved the delete and mknod to after the /usr/local/bin/pvrsrvctl --start --no-module and added a sleep 1, the file permissions were set correctly. Unfortunately this only work when I run the script manually, it doe not work with reboot (maybe sleep cannot be used) So, I am still trying to find a solution, but I am running out of things to try Thanks Rob On Sunday, 27 November 2016 21:59:06 UTC, Moscowbob wrote: > > > I have just built fresh kernel, dtb, u-boot and sgx as per RCN eewiki > <https://eewiki.net/display/linuxonarm/BeagleBone+Black#BeagleBoneBlack-LinuxKernel> > and > I have also built Qt 5.6.2. > Everything is working correctly except for one problem which I do not > understand and hope somebody could explain. > > After installing sgx drivers and a reboot I have everything as per > instructions: > > lsmod | grep omaplfb > > omaplfb 12356 0 > tilcdc 26717 1 omaplfb > pvrsrvkm 157212 1 omaplfb > > but my Qt Quick programs only work when run as root (sudo). > > Looking at the sgx-startup script, /dev/pvrsvrkm should be set with 666 > permissions, but after startup this is what I get: > ls -al /dev/pvrsrvkm > crw------- 1 root root 247, 0 Nov 27 20:54 /dev/pvrsrvkm > > When I run: > sudo /etc/init.d/sgx-startup.sh stop > sudo /etc/init.d/sgx-startup.sh start > > I get: > sgx: Starting PVR > /usr/local/bin/pvrsrvctl: SrvInit failed (already initialized?) (err=129) > > ls -al /dev/pvrsrvkm > crw-rw-rw- 1 root root 247, 0 Nov 27 21:48 /dev/pvrsrvkm > Permissions are now correct for running program as normal user. > > my programs run correctly with platform eglfs - which is what I want. > > My questions: > > 1. Why does sgx-startup.sh not set the permissions correctly on boot and > is there a way to solve this? > > Thanks in advance > > Rob > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/34bbc924-70f6-49cf-96f1-f758a802d29d%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
