Hi Kars, On Tue, Jan 29, 2019 at 10:17 AM Kars de Jong <jo...@linux-m68k.org> wrote: > Op ma 28 jan. 2019 om 21:32 schreef Michael Schmitz <schmitz...@gmail.com>: > > How much RAM does your HP have? > > It has 64 MB, so no problems there.
But it is located at the end of the 32-bit address space ;-) Is HP9000/300 the only platform where that is the case? > > Your NFS root file system is probably of a similar vintage to what I use > > with only 14 MB. No trouble up to kernel version 4.20. 5.0-rc7 (??) also > > boots OK, but some recent changes to the VM config appear to cause > > frequent page allocation failure (the kernel attempts to keep a lot more > > free pages in reserve than it used to do in 4.20). If you are low on > > memory, I'd stick with 4.x for now. > > I tried several kernels, 4.20, 5.0 and some late 2.6.3x version. > > > How far along in the boot do you get? > > Not far. Screen goes blank, the leds stay at state 0x55 (set right > before calling start_kernel()). > > But this gave me a feeling of deja-vu... > (https://marc.info/?l=linux-m68k&m=117175646524933 - it broke after > introducing discontinuous memory support). > > Digging a bit deeper it turns out that the proposed patch from Roman > (https://marc.info/?l=linux-m68k&m=117184910524555&w=2) that fixed my > problem never made it into the tree. > Since then there have been more changes to > arch/m68k/kernel/mm/motorola.c so that patch probably needs some > changing (and testing on other platforms). The first two hunks seem to be some safeguards for cases that cannot happen (memory size must be a multiple of 256 KiB, IIRC, at least on '020/030). Oh, you had subtracted two from the real size, to avoid wrap around. Yes, then the memory size is no longer a multiple of 256 KiB. There may be other places in the kernel where the '020/'030 assumes a multiple of 256 KiB, so I'd recommend not doing that. The remainder is a fix for address wrap around when there is memory located at the end of the 32-bit address space. That part looks OK to me, and is still applicable. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@linux-m68k.org 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
