On Mon, May 27, 2019 at 4:00 PM Nils Hölscher <nilho...@gmail.com> wrote:
> Hi Vijay, > > On Mon, 27 May 2019 at 12:15, Vijay Kumar Banerjee < > vijaykumar9...@gmail.com> wrote: > >> >> >> >> On Mon, May 27, 2019 at 1:24 PM Nils Hölscher <nilho...@gmail.com> wrote: >> >>> Hi, >>> >>> I tried to rout the PRUs pins via device tree overlay this week. >>> Sadly I wasn't able to produce results on linux with this method. >>> Please check my blog post concerning this issue. >>> >>> https://nilshoel.home.blog/2019/05/27/setting-up-prus-pins-via-device-tree-files/ >>> >>> It would be great if someone having experience with device tree overlay >>> could get me some feed back. >>> I will now move on to setting up RTEMS and porting the drivers. >>> >>> Hello Nils, >> >> I read your blog and had a look at the overlay. From first look at the >> overlay I noted that you're using `target-path`. I think target-path holds >> a path string like "/path" instead of a reference to your pruss. Maybe >> there should be a `target` field and you'll have to seth the target path >> manually or just remove it if you're not using it. >> >> A few pointers that helped me in general, to get an overlay working : >> * always check for the -@ option while compiling with dtc >> > I am compiling on the bone with: dtc -O dtb -I dts -o > /lib/firmware/PRU-GPIO-EXAMPLE-00A0.dtbo -b 0 -@ PRU-GPIO-EXAMPLE-00A0.dts > >> * before applying using a bootscript in u-boot, it might be a good >> idea to use the fdtoverlay tool ( in linux host) and apply it on your >> host system. >> > * If it applies well, then just decompile the dtb with the >> dtc and have a look at the device you were targeting, if your changes >> look nice and so far you didn't get any error during the building, >> open >> u-boot and manually apply overlay using `fdt apply`. >> >> With a quick look these pointers might be helpful. I'm working on porting >> the i2c stack from FreeBSD to RTEMS and have used an overlay for the >> path and compatibility. Hope these pointers were of some help. >> I can explain any of the points above if they're not clear and you can >> post >> the error log here as well ( if you luckily get proper error messages >> ;-) ) >> >> Thank you for these helpful notes. > I will try them this week and report back. > It would be nice if you could tell me the command you use for decompiling > the files. > > Just reverse the options in dtc something like : `dtc -I dtb -O dts -o REV_PRU-GPIO-EXAMPLE-00A0.dts PRU-GPIO-EXAMPLE-00A0.dtb` > Best, > Nils > >> Regards, >> Vijay >> >>> Best regards, >>> Nils Hölscher >>> _______________________________________________ >>> devel mailing list >>> devel@rtems.org >>> http://lists.rtems.org/mailman/listinfo/devel >> >>
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