_ _ _ _ _(_) ___ ___| |_| | | | | | |/ _ \ / __| __| | | |_| | | (_) | (__| |_| | \__,_|_|\___/ \___|\__|_| trivial utility for manipulating simple Linux UIO devices ("Userspace I/O"). eg, reading and writing bytes to memory mapped devices or monitoring interrupts. can list all devices and their mappings. little-endian by default. ------------------------------------------------------------------------------- gcc uioctl.c -o uioctl ------------------------------------------------------------------------------- ./uioctl -h little-endian by default -w select word width (default: 4) -s size of mmap (default: base + length, rounded up to PAGE_SIZE) ./uioctl /dev/uio0 0 -n 100 -w 1 -r 0 ./uioctl /dev/uio0 0x818 0 ./uioctl /dev/uio0 -m ./uioctl -l BUT WAIT? hexdump -C /dev/uio0 -s 0x ------------------------------------------------------------------------------- UIO: user-space drivers (2007) https://lwn.net/Articles/232575/ The Userspace I/O HOWTO (2006-2009) https://www.kernel.org/doc/htmldocs/uio-howto/ Simple userland drivers for FPGA interfaces (eg, AXI) http://svenand.blogdrive.com/archive/150.html devmem2.c: Simple program to read/write from/to any location in memory http://sources.buildroot.net/devmem2.c pydevmem https://github.com/kylemanna/pydevmem