Hello,
This may be the first of many questions regarding the caches on the
SA-1110, so I beg the indulgence of the reader.
Section 6.2.3 of the SA-1110 manual describes the procedure for
software-flushing the dcache, as follows:
mov r0, #0xe0000000
add r1, r0, #8192
1: ldr r2, [r0], #32
teq r1, r0
bne 1b
mcr p15, 0, r0, c7, c6, 0 @ invalidate D cache
mov pc, lr
I'm calling this from C, and as soon as I try to return from the calling
routine, I get a data abort. Examination of the stack frame reveals that
memory corruption has occurred.
(This is in a boot loader. Nicolas pointed out that this procedure is
used in the kernel decompressor prior to entering the kernel, but it
appears that no memory accesses take place between the invalidate and
the kernel jump.)
Eventually, the goal here is to debug the bootldr features which allow
interactive enabling and disabling of the i/dcaches, as well as to shut
down the caches before entering the kernel decompressor.
What am I missing?
Thanks,
-jd
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