components base address and offsets

If you are talking about the macros like IORD_32DIRECT, offset is just how many bytes from the base address.

For example if you have a component which has two 32bit registers, you might have something like this:

BASE = 0x1000 //some base address

LENGTH = 2 //2 registers

Then to read the first register you would have

IORD_32DIRECT(BASE, 0); //first register is at BASE+0 bytes

To read the second register you would have:

IORD_32DIRECT(BASE,4); //second register is at BASE+4 bytes (aka BASE+32bit)

If you were trying to access fourth byte of the first register you would do:

IORD_8DIRECT(BASE,3); //fourth byte of first register is 3 bytes after the base address.