[U-Boot-Users] assembler directive doubt

[naveen]

Hi everybody ,

                      I am new to this group . I have one doubt in 
understanding u-boot code .

I an using MPC8245 processor . in file u-boot-1.1.2/cpu/mpc824x/start.S 
,can anybody explain meaning of assembler
directive like

CFG_INIT_RAM_ADDR at h
CFG_INIT_RAM_ADDR at l

IF any body understood already plz give me how to go through source code 
.What file does control jumps after start.s


regards
Naveen