Date: Fri, 19 Feb 2021 00:52:54 +0100 From: Kristoff <kristoff@skypro.be> To: Ian Lepore <ian@freebsd.org>, freebsd-arm@freebsd.org Subject: Re: device-tree on BeagleBone Black (enabling UART) Message-ID: <629d6766-763b-0120-6bd8-9bcdbc280561@skypro.be> In-Reply-To: <596e6c178a78a8c5bdb62505f593b3878aae1a1f.camel@freebsd.org> References: <29ee61d3-6eb7-ccf7-3de9-2ecdccdcbb6b@skypro.be> <06f5ba53fac300855b580d127fdfc57466807a9c.camel@freebsd.org> <a9c73d47-f0a6-3c3a-645a-bedd709b9f3d@skypro.be> <596e6c178a78a8c5bdb62505f593b3878aae1a1f.camel@freebsd.org>
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Hi all, (inline comments) On 12/02/2021 3:15 a.m., Ian Lepore wrote: > >>> The beaglebone has a special pps driver that uses the am335x chip's >>> timer hardware to measure the pps pulse time with better accuracy >>> than >>> the generic gpio-pps driver. To use it, add >>> >>> am335x_dmtpps_load=YES >> At the same time I also wanted to try the pps driver you mention. >> >> However, it does not seams to load. >> >> I get this: >> >> [root@black1 ~]# kldload am335x_dmtpps >> kldload: can't load am335x_dmtpps: No such file or directory >> >> >> The issue seams to be this: >> >> # dmesg >> (...) >> KLD am335x_dmtpps.ko: depends on ti_sysc - not available or version >> mismatch >> >> Looking on my system, I seems to have the source of 'to_sysc', but >> not >> the .ko. >> [root@black1 ~]# locate ti_sysc >> /usr/src/sys/arm/ti/ti_sysc.c >> /usr/src/sys/arm/ti/ti_sysc.h >> >> >> What is the procedure to compile one single kernel-module? >> I tried "make ti_sysc", but that failed due to compilation errors >> >> > Hmm, are you using the GENERIC kernel, or a custom kernel, or what? > The ti_sysc device is a relative newcomer, and we may have neglected to > add it to the GENERIC config. There probably isn't a makefile to build > it as a module. > > So the fix for that would be to add 'device ti_sysc' to whatever kernel > config you're using and rebuild the kernel. OK, still working on this. Still stuck: UART now works! PPS does not. Sofar not solution. This is my situation: - FreeBSD 12.1: device-tree does not seams to work - FreeBSD 12.2: for some reason, all "beaglebone" images I find on https://download.freebsd.org/ftp/snapshots/arm/armv7/ISO-IMAGES/12.2/ do not boot at all, or -if they boot- have strange issues. (like a simple reboot taking up 2 hours!) - FreeBSD 13.0: Now still running an version: --> the version I do have now is this one: FreeBSD 13.0-CURRENT #0 f2ea0734875-c254544(main): Thu Nov 19 09:15:27 UTC 2020 root@releng1.nyi.freebsd.org:/usr/obj/usr/src/arm.armv7/sys/GENERIC But that does not contain the "ti_sysc" module. (as stated earlier) -> I wanted to try a newer version, all "beaglebone" images for 13.0 seams to have disappeared from the ftp-server https://download.freebsd.org/ftp/snapshots/arm/armv7/ISO-IMAGES/13.0/ (actually, that folder does not even exist any more) -> I also tried using the 13.0 kernel with gpiopps module (better then nothing), sofar without success. So, I guess, the next step is -as you proposed- to try to compile a new kernel. I have never done this. I have been looking in the handbook how to do this. I guess I need to create a 'MYKERNEL' file for the beaglebone. Question. Is there a repository of 'MYKERNEL' files for board so I have a config-file to start from. I do not know all the kernel-options and hardware-features of the beaglebone black, it would be nice to have something to start from that I know actually works! Note: As proposed, I added the line "device ti_sysc" at the end of the configuration-file, but I get this error: config: Error: device "ti_sysc" is unknown I guess that one line in the config-file is not enough? (Anycase, I am really learning a lot here) > -- Ian > Cheerio! Kr. Bonne.
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