On Monday 03 February 2020 14:53:09 Lennart Sorensen wrote: > On Mon, Feb 03, 2020 at 01:50:25PM -0500, Gene Heskett wrote: > > 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. > > > > The pi-4b is a whole new critter worth looking at. > > > > 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. > > Ehm, I was pretty sure all Raspberry Pi models have broadcom videocore > graphics, and certainly not mali. > > > 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. > > > > 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. > > I don't see how adding USB disks should change anything. > > Did you upgrade the working 10.0 system, or did you do a new image? > Because the only think that makes sense to me is that the 10.0 image > wasn't a pure Debian image, but rather one modified enough for RPi4 > operation. > It Just ran, updated to 10.2 by apt upgreade. Nothing heroic at all.
> > Thanks Len, for any enlightement. > > I don't have a 4 (only a 2 and 3 so far). What I have read made me > think that it simply should not work so far with Debian. There > appears to be some unofficial modified images out that that should > work. 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>
