Hello everyone,
I'm hitting the exact same problem on ARM as Andreas.
I have a physical address mapped into the virtual address space and
marked it as uncacheable.
When I now write to the virtual address from my SE-program (multiple
times), exactly one read access is made to the corresponding
Hi,
Thank you for the replies!
I mapped the physical address of the device to a virtual address and marked it
as uncacheable and did the trick for X86. So now using memcpy() I read/write
from and to the device using it's mapped virtual address.
However, for ARM it only works for read. Even if
I agree with Hoa that you're using virtual addresses, and those are
unrelated to the physical addresses you're trying to access. The second
method is probably moving an immediate constant into the register, and not
loading from a memory address. mmap-ing the physical pages you're
interested in woul
Hi Andreas,
My guess is that for Method 1, the pointer is of a virtual address so
there's a page fault there.
I'm not sure why the write() function wasn't invoked on Method 2. I got
into the same problem recently where I used mmap() to write to a physical
address, which should be handled by a Pio
