Linux 2.4.17 bug, mmap of /dev/mem

[David Ashley]

I can see the problem right in arch/ppc/mm/ppc_mmu.c, in the MMU_init_hw
function. The code goes:
	if ((cur_cpu_spec[0]->cpu_features & CPU_FTR_HPTE_TABLE) == 0)
		return;

But later on there is code to set hash_page[0] = 0x4e800020. Instead
of returning it should execute that else clause, and make hash_page return.

After making that change the problem appears fixed, at long last. It wasn't
buggy hardware at all, it *was* a bug in the linux kernel.

-Dave

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