[U-Boot-Users] mpc8260 reset procedure

[Ho Lee]

Hi Walter,

According to your HRCW configuration, IMMR is set to 0x0f000000 after reset. 
CFG_DEFAULT_IMMR must be the IMMR after system reset (in your configuration,
0x0f000000 not 0x00010000), and CFG_IMMR is the IMMR that you would like
to use inside u-boot. Since you keep the IMMR defined by HRCW, you don't need to 
define the CFG_DEFAULT_IMMR. Just comment out the CFG_DEFAULT_IMMR
definition, and I guess it will fix your problem.

Sincerely,
Ho

----- Original Message ----- 
From: "walter dicarlo" <walter_dicarlo at yahoo.com>
To: <u-boot-users at lists.sourceforge.net>
Sent: Wednesday, June 09, 2004 7:58 AM
Subject: [U-Boot-Users] mpc8260 reset procedure


Hi all,
I am new to embedded world and I am trying to port
u-boot on a board based on the mpc8260.
I hope I can bore you a little bit with a simple
question.
I use the Lauterbach Trace32 to program the 4Mb flash.
I compile u-boot 1.0.2 using the following settings:
TEXT_BASE = fff00000
CFG_DEFAULT_IMMR = 00010000
CFG_IMMR = 0f000000
CFG_SDRAM_BASE = 00000000
CFG_FLASH_BASE = ffc00000
CFG_BR0_PRELIM = ffc01001
CFG_OR0_PRELIM = ffc00856
CFG_BR1_PRELIM = 00000041
CFG_OR1_PRELIM = f8002b00
HRCW = 08 c2 01 07
Note that I use three Trace32 scripts to:
- init the board
- store the HRCW at the begin of the flash (FFC00000)
- store the u-boot.bin at fff00000

My problem is with the HRCW and the reset procedure.
It is not clear how it works and what steps I should
follow to setup everything.

When I start debugging, the Program Counter starts
correctly from fff00100, 
but as soon as the code starts to manage IMMR
everything seems to not
work. It is like the code expect the registers in one
position but in reality 
it is in another location.

I know it is basic knoledge about the mpc8260 but do
you have any advices?
Thanks

Walter