Ok guys, here is my first question on how to change to another kernel version. I'm using a BBG for my omni-robot project, and started opting for using the PRU's to generate accurate variable frequency PWM signals for my stepper motors (my c code was still showing the occasional delays in frequency pulses due to the non-realtime nature of the kernel). At the time, I was using linux-image-4.1.15-bone-rt-r18. I'm not yet convinced to use the remoteproc driver to handle the PRU's, and would like to use the uio driver instead. It boils down to two questions in the end:
1) is it possible to install another kernel image, and how is this done exactly? Unfortunately I managed to get my image on the sd-card unbootable when installing another kernel (bone-kernel instead of ti-kernel). I guess that uEnv.txt is not correctly updated when switching kernels. Actually I forgot to install the kernel headers in the same pass, and this lead to a series of upgrade errors maybe causing the booting issue. I might be able to restore my image somehow if possible, although I still can use the data by just inserting the SD card in my PC. That let me wonder secondly, I now downloaded a more recent sd-card image (bone-debian-8.4-lxqt-4gb-armhf-2016-05-13-4gb.img with 4.4.9-ti-r25 kernel), but what does this image exactly contain? In the end I'm looking for a kernel version supporting PRU uio drivers enabling me to use the prussdrv.h in my c files. I understood that the bone-kernel is to be used instead of the ti-kernel, although when now having a quick peek into what drivers are actually loaded I see to my surprise uio_pdrv_genirq, so I guess the naming convention of "ti" kernels was changed somewhere in the past, although not entirely sure if this was correct in the first place. I made a dump of available kernels of this release, and shows a huge amount of kernels, which more or less show some understandable (but also less understandable) variations. There's for instance linux-image-4.4.9-ti-rt-r25 but also linux-image-4.4.9-bone-rt-r10 as well as linux-image-4.4.9-armv7-rt-x7 and more flavours combinations. Here's my guess when reading some forum posts: ti: (with remoteproc instead of uio PRU driver?) bone: (with uio instead of remoteproc PRU driver?) dbg: (meaning debug?) rt: (meaning soft realtime?) 2) The "ti" version seems to be dropped starting the 4.5.0 series kernel, so I guess remoteproc was dropped in the end with newer kernels altogether? So I think I'm fine with the new downloaded image but feels a bit fuzzy hit& miss if this is the correct one. Anyone some hints or tips where to find some more details on the kernel versioning? -- 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/e1904f5a-63b2-45fd-985e-2cb96c86fcb3%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
