On Fri, Aug 15, 2014 at 11:08 AM, Terje Froysa <[email protected]> wrote: >> Thanks again for your quick reply! > > > With "as intended" I refer to the lecture given at: > http://elinux.org/BeagleBone_Black_Enable_SPIDEV > and many other lectures i have studied made me think that I (anyone) could > throw out predefined pin configurations and ad-hoc substitute them with my > own in the /lib/firmware directory.
That "works" for the old Angstrom image. I 'can' make it work the same way with debian, however there will be a 2 minute delay on bootup thanks to udev on bootup. > When I find the .dtbo working by placing them /lib/firmware and using "echo > <device>.dtbo > $SLOTS, I (of course) get confused when the files are not > accepted (and with no explanation) during boot. > The confusion arises (like you say) when no other .dtbo file is accepted > during boot but the "built ins" while no information is given but "loading > failed". > Replacing an existing .dtbo and finding that the pins were configured as the > origninal file suggests that the content of the /lib/firmware .dtbo's > doesn't seem to count at all. > > I have used some 4-5 working days on this subject convinced that it all had > to be my mistake since I couldn't find any consistent information about > this. All documents and lectures on the web seemed to tell that loading > custom ad-hoc .dtbo's by uEnv.txt was feasible. > > You are the first to tell me that the Linux cape configurations have to be > furnished by anyone but ourselves. We are making a one-of-a-kind cape in a > scientific research context. It really shouldn't be necessary to submit a > short-sighted experiment although in professional context. We are doing > changes steadily and plan to use BBB in many different activities (also in > cooperation with the NTNU, Norwegian University of Technology). I don't > think we will want to overthrow you with numerous patches for different > projects. > > Well, I'm learning, but knowledge is sometime hard to obtain. > In 1987, as a Unix system responsible, I learned the saying: > "Manuals...? Which manuals...? This is Unix my son, you gotta know!" :-) > > I guess I have to do a script running after boot that loads the .dtbo and > reconfigures the pins. see: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#Loading_custom_capes It's already setup for you to use it in the image. Regards, -- Robert Nelson http://www.rcn-ee.com/ -- 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]. For more options, visit https://groups.google.com/d/optout.
