Hi Rob, On Wed, Jan 18, 2023 at 5:50 AM Rob Landley <rob@xxxxxxxxxxx> wrote: > On 1/17/23 14:26, Geert Uytterhoeven wrote: > > On Tue, Jan 17, 2023 at 8:01 PM Rob Landley <rob@xxxxxxxxxxx> wrote: > >> I'm lazy and mostly test each new sh4 build under qemu -M r2d because it's > >> really convenient: neither of my physical boards boot from SD card so replacing > >> the kernel requires reflashing soldered in flash. (They'll net mount userspace > >> but I haven't gotten either bootloader to net-boot a kernel.) > > > > On my landisk (with boots from CompactFLASH), I boot the original 2.6.22 > > kernel, and use kexec to boot-test each and every renesas-drivers > > release. Note that this requires both the original 2.6.22 kernel > > and matching kexec-tools. > > I make it a point to run _current_ kernels in all my mkroot systems, including > sh4. What I shipped was 6.1 is: > > # cat /proc/version > Linux version 6.1.0 (landley@driftwood) (sh4-linux-musl-cc (GCC) 9.4.0, GNU ld > (GNU Binutils) 2.33.1) #1 Tue Jan 10 16:32:07 CST 2023 I think you misunderstood: renesas-drivers releases[1] are current kernels. Linux version 6.2.0-rc3-landisk-01864-g0c6453b3e5f6 (geert@rox) (sh4-linux-gnu-gcc (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0, GNU ld (GNU Binutils for Ubuntu) 2.38) #125 Tue Jan 10 14:29:01 CET 2023 I use 2.6.22 and kexec as a boot loader for newer kernels, to avoid juggling CF cards. I cannot install a newer base kernel on the CF, as kexec is broken upstream. > > Apparently both upstreamed kernel and > > kexec-tools support for SH are different, and incompatible with each > > other, so you cannot kexec from a contemporary kernel. > > Sure you can. Using toybox's insmod and modprobe, anyway. (That's the target I > tested those on... :) > > Haven't messed with signing or compression or anything yet, my insmod is just > doing syscall(SYS_finit_module) and then falling back to SYS_init_module if that > fails and either fd was 0 or errno was ENOSYS. (Don't ask me why > SYS_finit_module doesn't work on stdin...) > > https://github.com/landley/toybox/blob/master/toys/other/insmod.c#L31 > > https://landley.net/toybox/downloads/binaries/0.8.9/toybox-sh4 Again, I think you're talking about something different. Does kexec work for you? > > I tried working my way up from 2.6.22, but gave up around 2.6.29. > > Probably I should do this with r2d and qemu instead ;-) > > I have current running there. I've had current running there for years. Config > attached... > > > Both r2d and landisk are SH7751. > > Cool. Shouldn't be hard to get landisk running current then. Current kernels work fine on landisk with an old Debian userspace on CF. The 8139cp driver is a bit flaky: last time I tried nfsroot, that didn't work well. [1] https://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
