Hi Kars,
On Tue, Jan 29, 2019 at 10:17 AM Kars de Jong <jongk@xxxxxxxxxxxxxx> wrote:
Op ma 28 jan. 2019 om 21:32 schreef Michael Schmitz <schmitzmic@xxxxxxxxx>:
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 -- 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
