On Tue, Jun 14, 2016 at 2:47 PM, Dave Mazzoni <dav...@gmail.com> wrote:
>
> Thanks for the suggestions. I'm a bit confused though since Mmap returns a
> slice of bytes. I print all the bytes as you can see, but only the first
> byte at each 32 bit boundary is correct. I don't know casting several of
> them together would somehow derive the correct value.
Because Mmap returns a []byte, every access using that []byte will
load a single byte. But device memory is often magic. Doing a byte
load and doing a word load are two very different things from the
device's perspective. So what we're suggesting is that you do
something like
b := syscall.Mmap(...)
w := (*[1024]uint32)(unsafe.Pointer(&b[0]))
and then print w[0]. That will access the memory as a 32-bit word, not a byte.
Or conversely change your C program to print out one byte at a time
and see what you get.
Ian
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