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kernel-image-2.4.27-powerpc-smp-pmac unstable with CONFIG_HIGHMEM=y

Is anybody else running 2.4.x on a PowerMac Dual G4?  (I've got a "mirrored
drive door" model[1].)

If I take the kernel-patch-powerpc-2.4.27 source package and rebuild it
with config/powerpc-smp changed so that CONFIG_HIGHMEM=y (instead of being
not set), the resulting kernel is horrendously unstable.

I can't even get through the boot process with processing segfaulting, or
the dynamic linker failing to resolve symbols.

Returning to a "# CONFIG_HIGHMEM is not set" kernel that is otherwise
identical is extremely stable and reliable.

Problem is, I've got a gig of RAM and, you know, I'd like to actually use
it all.

Here's the beginning of dmesg with a non-highmem kernel:

Memory BAT mapping: BAT2=256Mb, BAT3=256Mb, residual: 512Mb
Warning, memory limited to 512 Mb, use CONFIG_HIGHMEM to reach 1024 Mb
Total memory = 512MB; using 1024kB for hash table (at c0600000)

Unfortunately I don't have the output of the highmem kernel anymore, but I
can reboot the box into that horrible unstable kernel to collect it if need

If I had to speculate, I'd say these parameters have something to do with


[1] http://www.lowendmac.com/ppc/g4-125.html

G. Branden Robinson                |     When I die I want to go peacefully
Debian GNU/Linux                   |     in my sleep like my ol' Grand
branden@debian.org                 |     Dad...not screaming in terror like
http://people.debian.org/~branden/ |     his passengers.

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