I have the mesa stuff running, as in full screen glxgears is >50 fps, I think I am ready to tackle the next step in making linuxcnc run on a rpi4, which is building it a realtime kernel.
So, Following along with the kernel-building page from the raspian site: #>sudo apt install bc bison flex libssl-dev No errors. modify the git command to git the latest kernel that uname says it is: #>sudo git clone --depth=1 https://github.com/raspberrypi/linux -b rpi-4.19.y-rt #>sudo chown -R pi:pi linux #>cd linux #>make bcm2711_defconfig no errors skip to rpi-4 instructions; but do a make menuconfig first to check stuff Trouble, needs ncurses-devel or libncurses-dev: * Unable to find the ncurses package. * Install ncurses (ncurses-devel or libncurses-dev * depending on your distribution). I suspect wayland is the culprit.. sudo apt can't find any ncurses packages use less to verify the rt stuff is set, is: # Timers subsystem # CONFIG_TICK_ONESHOT=y CONFIG_NO_HZ_COMMON=y # CONFIG_HZ_PERIODIC is not set CONFIG_NO_HZ_IDLE=y # CONFIG_NO_HZ_FULL is not set CONFIG_NO_HZ=y CONFIG_HIGH_RES_TIMERS=y CONFIG_PREEMPT=y CONFIG_PREEMPT_RT_BASE=y CONFIG_HAVE_PREEMPT_LAZY=y CONFIG_PREEMPT_LAZY=y # CONFIG_PREEMPT_NONE is not set # CONFIG_PREEMPT_VOLUNTARY is not set # CONFIG_PREEMPT__LL is not set # CONFIG_PREEMPT_RTB is not set CONFIG_PREEMPT_RT_FULL=y CONFIG_PREEMPT_COUNT=y So, not being able to intelligently modify it, I fire off a "make -j2 zImage modules dtbs" to see what falls out. I'd try the j4, but w/o a fan on that big one piece heat sink, and its hot already, a j4 might be pushing my luck. Half an hour later its still munching along at about 3x a pi3's speed. Now, I see something in the raspberry kernel building docs that I think will be handier than sliced bread, I can name the zImage I copy to the /boot partition differently, as long as I also use that name as the kernel to boot in the /boot/config.txt file. So a quick edit of that file, either on a live machine, or in a reader, can put me back to booting the default kernel. I don't know as I can do that on a pi3. But it for sure is worth trying! The limit of course is the size of the /boot, and how full it is. On the pi4, 260 megs, df say its 16% used, so there is room to play. But the pi3 /boot is only 60 megs, and 55% used, so maybe not. Done but me somewhat confused. It built bcm2711-rpi-4-b.dtb which is in the /boot directory, but built it in /media/pi/workspace/kernel/linux/arch/arm/boot/dts/bcm2711-rpi-4-b.dtb, which is nearly the same location it built zImage in. There is an install.sh in that /arch/arm/boot directory, but it needs at least 3 arguments. Anyboy got an idea what to pass to it? 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> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
