Hi Utkarsh,
On Tue, 21 Jan 2020 at 18:06, Utkarsh Rai <utkarsh.ra...@gmail.com> wrote: > I have been waiting for my JTAG to arrive so that I can debug mmap > related issues, meanwhile I have been going through the implementation of > the PRU drivers on freebsd and linux and have few questions. > > 1. This > <https://bitbucket.org/rpaulo/libpru/annotate/default/ti-pru.c?at=default&fileviewer=file-view-default#ti-pru.c-614> > method will fail without a file in /dev, how are the drivers registered > in /dev in rtems? > Yes you are right, the pruss devices need to be registered in /dev. Rtems-libbsd uses a FileDeviceTree (FDT) to map the devices on the board and the Pruss driver should attach during boot. You can read here <https://nilshoel.home.blog/2019/08/03/the-libbsd-init-process-in-rtems-with-focus-on-driver-modules/> how drivers are attached in libbsd. Also take a look at the rtems documentation here <https://docs.rtems.org/branches/master/user/exe/device-tree.html>. Also you need a FDT from the BSD repository, and load it via uboot with rtems. The actual driver is found here <https://github.com/nilhoel1/rtems-libbsd/blob/pruss/freebsd/sys/arm/ti/ti_pruss.c> . > 2. As far as I could understand freebsd uses uio framework for > communication between PRU and the kernel , how is that implemented for the > RTEMS ? > When the devices are registered you use the code you linked in you first question. Basically the devices in /dev are hadeled like files but the driver links the file operations to other driver related functions. > > 3. On a side note, building rtems application through waf is very erratic > on my system( waf configure at times fails with 'could not find > <machine/rtems-bsd-sysinit.h>' header) . What other build system can be > useful for building rtems applications? > I'am sorry I can't help you with this one, since I only know about the waf system myself. > > I am sorry if my questions seem a bit naive, I am new to open source > development and I would be grateful for any help. > >
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