Hi all,
I need to access physical memory from userspace, the following
implementation doesn't work if offset < 0x400000.
open("/dev/mem", O_RDONLY)
mmap(0, len, PROT_READ,MAP_SHARED, fd, offset)
However, I happened to get a program to access lower physical memory
successfully.
====truss output====
open("/dev/xsvc", O_RDONLY) = 3
mmap(0x00000000, 131072, PROT_READ, MAP_SHARED|MAP_NORESERVE, 3,
917504) = 0xFEE5E000
But it doesn't work when I paste it to my C file. What did I miss? how
to access physical memory from userspace without restriction?
Thanks,
-Aubrey
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