Changing IO or memory value

Does anone have idea how to put certain value to a certain IO location from operating system. Is there some kind of debug or something? I need to read IO location 0x09030, change and then write it back. Leon Komlosi

WRAP board IIC port

I'm trying to connect various IC's to IIC port on WRAP.1E board. Without any success. IC's are Dallas DS1621,DS1631,DS1624. Here is dmesg line: DS1621: iic1: addr 0x48 22=0a 40=0a 41=0f 42=0a 43=0a 44=0a 45=0a 46=0a 47=0a 48=0c 49=10 4a=c4 4b=01 4c=0e 4d=00 4e=d6 4f=00 51=0f a1=0f a2=0a a8=0c