A command-line utility based on devmem2 by Jan-Derk Bakker .
Whereas devmem2 facilitates individual reads and writes to the physical addresses, uiomem3 facilitates the same to the maps exposed by UIO drivers .
Usage: ./uiomem3 UIO-DEVICE MAP-NUMBER OFFSET [ TYPE [ DATA ] ] Read-from or write-to the MAP-NUMBER of UIO-DEVICE at OFFSET. UIO-DEVICE the UIO device to open e.g. /dev/uio0 MAP-NUMBER the number of the UIO map in which to operate OFFSET memory offset in the map upon which to act TYPE access operation type : [b]yte, [h]alfword, [w]ord (default) DATA data to be written When DATA is not given OFFSET is read, otherwise DATA is written to OFFSET
 http://sources.buildroot.net/devmem2.c, for example / no homepage