[U-Boot-Users] mpc8260 reset procedure

[walter dicarlo]

Hi Ho,

I don't remeber the details but I have been forced to
define the CFG_DEFAULT_IMMR. However, now, I have
understood that the default IMMR should point to the
begin of the register area (in my case 0x0f010000)
while CFG_IMMR should point to the begin of the
processor memory map (in my case 0x0f000000).

Thanks for your suggestion

Walter



--- Ho Lee <flylist at linuxkernel.net> wrote:
> 
> 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
> 



	
		
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