-----------------------------------------------------------------------------
-For boards which boot from nand_spl, it is possible to save one copy
+For boards which boot from spl, it is possible to save one copy
if CONFIG_SYS_TEXT_BASE == relocation address! This prevents that uboot code
is copied again in relocate_code().
-example for the tx25 board:
+example for the tx25 board booting from NAND Flash:
a) cpu starts
b) it copies the first page in nand to internal ram
- (nand_spl_code)
+ (spl code)
c) end executes this code
d) this initialize CPU, RAM, ... and copy itself to RAM
(this bin must fit in one page, so board_init_f()
-----------------------------------------------------------------------------
-Relocation with NAND_SPL (example for the tx25):
+Relocation with SPL (example for the tx25 booting from NAND Flash):
- cpu copies the first page from NAND to 0xbb000000 (IMX_NFC_BASE)
and start with code execution on this address.
-- The First page contains u-boot code from u-boot:nand_spl/nand_boot_fsl_nfc.c
- which inits the dram, cpu registers, reloacte itself to CONFIG_SYS_TEXT_BASE and loads
+- The First page contains u-boot code from drivers/mtd/nand/mxc_nand_spl.c
+ which inits the dram, cpu registers, reloacte itself to CONFIG_SPL_TEXT_BASE and loads
the "real" u-boot to CONFIG_SYS_NAND_U_BOOT_DST and starts execution
@CONFIG_SYS_NAND_U_BOOT_START
- This u-boot does no RAM init, nor CPU register setup. Just look
where it has to copy and relocate itself to this address. If
relocate address = CONFIG_SYS_TEXT_BASE (not the same, as the
- CONFIG_SYS_TEXT_BASE from the nand_spl code), then there is no need
+ CONFIG_SPL_TEXT_BASE from the spl code), then there is no need
to copy, just go on with bss clear and jump to board_init_r.
-----------------------------------------------------------------------------
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 :-)