add-symbol-file u-boot 0x8ff08000
^^^^^^^^^^
get this address from u-boot bdinfo command
+ or get it from gd->relocaddr in gdb
=> bdinfo
rch_number = XXXXXXXXXX
baudrate = XXXXXXXXXX
TLB addr = XXXXXXXXXX
relocaddr = 0x8ff08000
- ^^^^^^^^^^
+ ^^^^^^^^^^
reloc off = XXXXXXXXXX
-irq_sp = XXXXXXXXXX
+irq_sp = XXXXXXXXXX
sp start = XXXXXXXXXX
FB base = XXXXXXXXXX
+or interrupt execution by any means and re-load the symbols at the location
+specified by gd->relocaddr -- this is only valid after board_init_f.
+
+(gdb) set $s = gd->relocaddr
+(gdb) symbol-file
+(gdb) add-symbol-file u-boot $s
+
Now you can use gdb as usual :-)