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. 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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