question about 8241 again

[llee <llee@huawei.com>]

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Hi, all,

I get confusion on linux PPC MMU management(kernel 2.6.3): It seems
linux setup an empty hashtable (in MMU_init_hw) first and do a
hash_page() when exception. But at least it should make a real mapping
for the kernel itself, shouldn't it? But I haven't found it do this
anywhere.

And also, when i add the following code in sandpoint_map_io(and I also
enable feature CPU_FTR_HPTE_TABLE for 8241):
    io_block_mapping(0x70000000, 0x70000000, 0x20000000, _PAGE_IO);
    io_block_mapping(0x80500000, 0x80500000, 0x00100000, _PAGE_IO);
the first call get a bat mapping and another get a page mapping, but
only the first one works find, the second one could not been access.

Could anybody tell me why?

Thanks advanced and sorry for my poor english.

Ken

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