On Tuesday 14 January 2020 16:26:02 Paul Thomas wrote: > On Tue, Jan 14, 2020 at 4:04 PM Gene Heskett <gheskett@xxxxxxxxxxx> wrote: > > On Tuesday 14 January 2020 12:15:37 Paul Thomas wrote: > > > On Tue, Jan 14, 2020 at 11:24 AM Gene Heskett > > > <gheskett@xxxxxxxxxxx> > > > > wrote: > > > > On Tuesday 14 January 2020 08:54:30 Paul Thomas wrote: > > > > > On Sun, Jan 12, 2020 at 9:44 PM Gene Heskett > > > > > <gheskett@xxxxxxxxxxx> > > > > > > > > wrote: > > > > > > On Friday 10 January 2020 15:14:30 Sebastian Andrzej Siewior > > > > wrote: > > > > > > > Dear RT folks! > > > > > > > > > > > > > > I'm pleased to announce the v5.4.10-rt5 patch set. > > > > > > > > > > > > > > Changes since v5.4.10-rt4: > > > > > > > > > > > > > > - Dick Hollenbeck reported that the printk rework had a > > > > > > > negative impact on the 8250 driver if not used as a > > > > > > > console. Patch by John Ogness. > > > > > > > > > > > > > > Known issues > > > > > > > - None > > > > > > > > > > > > > > The delta patch against v5.4.10-rt4 is appended below and > > > > > > > can be found here: > > > > > > > > > > > > > > > > > > > > > https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.4/in > > > > > > >cr/p atch -5.4 .10-rt4-rt5.patch.xz > > > > > > > > > > > > > > You can get this release via the git tree at: > > > > > > > > > > > > > > > > > > > > > git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt- > > > > > > >deve l.gi t v5.4.10-rt5 > > > > > > > > > > > > I grabbed a copy of this, then turned off anything not > > > > > > needed to run LinuxCNC on an rpi4 in armhf config. Then I > > > > > > noted its make had a make deb-pkg option. But it isn't > > > > > > making what I told it to make as I'm sitting here watching > > > > > > it ALL go by. Did I miss something in a make menuconfig > > > > > > that triggered a make all? It was supposedly set for armhf. > > > > > > But I'm even seeing x86 stuff go by. Obviously I know just > > > > > > enough to screw it up. Point me at the right docs for arm > > > > > > builds please. > > > > > > > > > > > > Hi Gene, > > > > > > > > > > I recently stumbled into deb-pkg, and it's awesome building up > > > > > the source and standard debian packages all in one command, > > > > > but it takes the same arguments as a standard make. For rpi4 > > > > > this is arm64 not armhf so you probably want something like > > > > > below to configure for arm64 > > > > > > > > armhf (32 bit) runs fine in on an RPI4, been doing it for a > > > > couple months now. With a 32 bit stack frame, context switch > > > > latencies are several microseconds better which linuxcnc loves. > > > > However with mesa interface cards handling all the > > > > sub-millisecond stuffs and using preempt-rt running in > > > > userspace, it all works quite well as the max latency stays > > > > below 200 microseconds 99.99% of the time. Thats well within the > > > > servo-thread time of 1 millisecond the mesa cards need. > > > > > > Ah, makes sense. > > > > > > > > If you are doing this on the rpi4 you don't need the > > > > > CROSS_COMPILE= option.[1][2] make -j4 ARCH=arm64 > > > > > CROSS_COMPILE=aarch64-elf- defconfig > > > > > Or if the kernel you're already running has a /proc/config.gz > > > > > you can use that directly (zcat /proc/config.gz > .config). > > > > > Then you can use the main make. > > > > > > > > The kernel I an running was built, by me (queue the raspberry > > > > noises), with only the ondemand governer so while its working, > > > > its stuck in low gear. And the pi has plenty of cooling. > > > > > > > > that kernel running now is a 4.19.71-rt24-v7l+ #1 SMP PREEMPT > > > > RT, but there has since been added another video speedup option, > > > > so ATM I am trying to build a 4.19.94-rt38 announced last week. > > > > But the git clone I pulled doesn't have the rt patch. And > > > > pulling that patch with curl today fails: > > > > > > > > pi@rpi4:/media/pi/workspace $ curl > > > > http://www.kernel.org/pub/linux/kernel/projects/rt/4.19/patch-4. > > > >19.9 4-rt38.patch.xz > > > > > > Hmm, this seems fine for me: > > > wget > > > https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.19.94.tar.xz > > > tar xf linux-4.19.94.tar.xz > > > cd linux-4.19.94/ > > > wget > > > http://www.kernel.org/pub/linux/kernel/projects/rt/4.19/patch-4.19 > > >.94- rt38.patch.xz > > > unxz patch-4.19.94-rt38.patch.xz > > > patch -p1 < patch-4.19.94-rt38.patch > > > > I blew away my git clone and followed this, which all worked to > > here, > > > > but: > > > make ARCH=armhf defconfig > That was the fix. make -j4 zImage underway now. > Sorry that was a cut/paste typo, there is no arch/armhf just arm, so > you want make ARCH=arm defconfig > I had tried the command that's why it was in my history and thus the > copy/paste mistake. I believe how this works is the kernel just has > CONFIG_AEABI=y as the ABI config, then userspace compilers have to > decide if they want to compile for a hardware floating point or not, > and what debian has decided is that they would have a special > architecture just for hardfloat: > https://wiki.debian.org/ArmHardFloatPort > > thanks, > Paul I'll put this on a fresh 64Gig card, that way I'll have a fallback. Thank you very much Paul. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene>
