devmem

devmem

root@soc:~# devmem -h
BusyBox v1.35.0 (Debian 1:1.35.0-4+b3) multi-call binary.

Usage: devmem ADDRESS [WIDTH [VALUE]]

Read/write from physical address

        ADDRESS Address to act upon
        WIDTH   Width (8/16/...)
        VALUE   Data to be written
root@soc:~# 

write:
devmem 0xF0000000 32 0x12345678

read:
devmem 0xF0000000