I'm having trouble getting shared memory to work correctly.
I have a 486 with 16M of ram and SuSE 5.3 Linux. I have applied the
RTLinux patches to the source from this distribution which is based on
the 2.0.35 kernel. I'm trying to get the example shmex to run.
I added the line append="mem=15m" to lilo.conf and verified after a
reboot that the memory is unused with the program mempages. I changed
the BASE_ADDRESS def in shmex to read (15*0x100000). When I try to add
the module rtmod.o (with insmod rtmod.o) I get an Oops crash on the
first assignment to the shared block at 0xf00000 in init_module in
rtmod.o. I rebuilt the kernel with gdbstub and poked around in
do_page_fault and I can't see how it could ever work.
Can anyone tell me what's wrong?
The book "Linux Kernel Internals" as not been much help on this. Is
there a better book?
Steve Hampson
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