I download the 2.6.20 kernel(montavista), But there's a problem.
In the arch/arm/kernel/head.S, when open the MMU, mcr p15, 0, r0, c1,
c0, 0, where r0 is 0x00053177, the kernel is down.
The PC value in the current code position(opening MMU) is 0x80008074.
And the the page table is at 0x80004000, and in the address 0x80006000,
code has filled a value 0x80000c1e. This is so called identity mapping.
relative code:
mcr p15, 0, r5, c3, c0, 0 @ r5 is 0x0000001f set access
domain
mcr p15, 0, r4, c2, c0, 0 @ r4 is 0x80004000 set page
table base addr
mcr p15, 0, r0, c1, c0, 0 @ r0 is 0x00053177 open the MMU
0x80000c1e has filled in the physical address 0x80006000. (Identity
mapping a 1 MB space). And when open the MMU, the pc value is
0x80008074, which doesn't beyond the 1MB space.
Does other reason leads to failure? Thanks?
RichardLiu
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