On Monday 03 February 2020 11:34:41 Nigel Sollars wrote: > Perhaps you could leverage this from raspian,
I have no "leveerage" with raspbian. They officially have zero support for a realtime kernel. 4 posts to their forum in threads related, over4 days have not elicited a reply from anyone. I have no problems building kernels on the rpi4b as I two SSD'd mounted on sata-usb3 cables, so a full kernel bulld is under an hour in wall time. I also, because its only a 2G pi, have a 10G swap partition mounted, and the swapfile turned off to reduce pressure on the u-sd card. > https://lb.raspberrypi.org/forums/viewtopic.php?t=245908 > > I dont have any experience with this one nor have hardware ( not a pi > fan ). More Pi4 SoC info came in with 5.4/5 anyhow so you would want > something recent to get it done. The pi-4b is a whole new critter worth looking at. > Nige > > On Mon, Feb 3, 2020 at 11:00 AM Lennart Sorensen > > <lsore...@csclub.uwaterloo.ca> wrote: > > On Mon, Feb 03, 2020 at 10:41:17AM -0500, Gene Heskett wrote: > > > Written to a 64GB card with dd, makes zero attempt to boot on > > > rp4b. > > > > > > Put presently running raspbian buster 10.2 card back in, boots up > > > normal. > > > > > > Suggestions? > > > > According to https://wiki.debian.org/RaspberryPi there is no support > > for the Pi4 in Debian's kernel yet (after all it has to be supported > > upstream before Debian will support it). It is supported upstream by any linux-rt kernel newer than 4.14 although 4.14's support for the mali gfx isn't quite fully baked until 4.19.y. I am actually running a Linux rpi4.coyote.den 4.19.71-rt24-v7l+ #1 SMP PREEMPT RT Thu Oct 10 15:22:22 EDT 2019 armv7l GNU/Linux right now, but a /boot/dts/overlays directory has apparently been removed from newer ones, and I'm trying to find a workaround, or make an arm64 boot work and rebuild LinuxCNC to run on a 64 bit build. I'd settle for either scenario. > > Raspbian has no issues > > with using a patched kernel with stuff that isn't supported upstream > > yet as long as it makes Pi models work with it. > > > > Also the boot process for the 4 is completely different than the > > older models as far as I know. So it would appear Len. And I'll repeat, the original 10.0 netinstall Just Worked, and felt dead stable, but now a 10.2 of this buster doesn't even try to boot. The main diff is that there is now a pair of ssd's on sata adaptors plugged into the usb-3 ports with a total of 360G available as scratchpad workspaces. > > > > -- > > Len Sorensen Thanks Len, for any enlightement. 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>
