memory map

[zzh]

Hi,everyone.
I have some questions about the memory map on linux on 8xx and ppc
1)Some area eg BCSR mapped below KERNELBASE,is this safe?
I check some process's vm area,it does not fall in this area,will
it be unsafe under some circumstances?
2)I read mapin_ram() in mm/init.c ,found that phys mem is also mapped
both by bat and page table ,what is this for?
Can someone help me?


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