Dear all, To make a system with a minimal footprint, I am compiling my own kernel for the BeagleBone black. With this kernel I am trying to use the PRU using the uio-pruss (which memory maps the PRU memory and offers interrupts to userspace).
However, I cannot access the PRU memory. I tried to use devmem (part of busybox) to read the address to which the PRU is mapped and I get back: # devmem 0x4a300000 [ 568.572896] Unhandled fault: external abort on non-linefetch (0x1018) at 0xb6fd5000 [ 568.580634] pgd = 17e21f9e [ 568.583361] [b6fd5000] *pgd=9d4e4831, *pte=4a300183, *ppte=4a300a32 Bus error What I found for this type of error is that it could be caused by not having the right clocks enabled ( *https://forums.xilinx.com/t5/Embedded-Linux/Unhandled-fault-external-abort-on-non-linefetch-0x1018-at/td-p/904286* ) When I boot with the default ubuntu image for the BeagleBone Black (4.14.108-ti-r113), I am able to read the PRU memory. Therefore, I compared all clocks on the default ubuntu and adapted uio_pruss to enable all these clocks. This did not solve the issue. Anybody has some suggestions on what might be different between a linux-4.14.108 kernel and dtb and the default ubuntu image? Best wishes, Hugo -- 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/e32d648f-1279-499d-8c0a-937de8d5999e%40googlegroups.com.
