Patch to recover from segmentation fault on HiP4 MPC8260 versions (for kernels 2.4.x, x<10)

Here you may find a simple patch for 2.4 kernels up to version 2.4.10 to
support the HiP4 versions of MPC82xx:

In arch/ppc/kernel/misc.S replace _GLOBAL(_get_PVR) with the following:

_GLOBAL(_get_PVR)
mfspr r3,PVR
xor r17,r17,r17
xor r16,r16,r16
addi r17,r17,0x7FFF@l
addi r16,r16,0x10@l
slw r17,r17,r16
ori r17,r17,0xFFFF@l
and r3,r3,r17
blr


Best Regards

Apostol


----------------------------------------
Dr. Apostol Meliones
Ellemedia Technologies
223 Syngrou Ave., 17121, Athens, Greece
Tel: +30-10-9373095, Fax: +30-10-9370386


Allen Curtis wrote:

quoted

We moved to a new kernel (we were using 2.4.7) to support the PVR of the
HiP4 versions of MPC826x, so we tested 2.4.12, 2.4.18 and 2.4.20. We did
our porting mostly on 2.4.20. We had almost everything there. However,
we encountered a serious error related to memory management regarding
one of our drivers that was based on a port from MPC860 coded for kernel
2.4.4. Alternatively, we kept on working in parallel on 2.4.7 to find
out and cancel the PVR checks that were instructing the kernel to use an
incorrect cpu among the several available processor versions. This was
responsible for the segmentation fault. We deceived the kernel to take
8264 for 8260 and this way the problem was solved !!

Could you provide a patch for you modifications. If they are too ugly, just
send them to me. I am interested in maintaining an updated kernel for the
MPC processors.

Thanks

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