[U-Boot-Users] Question about MPC8272 HRCW

[Sam Song]

raymond yang <raymond_yang95134 at yahoo.com> wrote:
> Boot memory space. Defines the initial value for
> BR0[BA]. There are two possible bootmemory regions,
> HIMEM and LOMEM
> 0 0xFE00_0000 -- 0xFFFF_FFFF
> 1 0x0000_0000 -- 0x1FFF_FFFF "
> 
> 1) So if let BMS=0, 
> -   Does this mean the BR0[BA] have the exact
> address of 0xFE00_00000

You need not to do it. BR0[BA] should accord with real
FLASH size while BMS just define boot memory space.
Note : boot memory space refers to the boot sector 
space should be. It does NOT mean the whole FLASH.

> 2)
> With BMS=0 and CIP=0
> 
> According to the datasheet,
> 
> BR0[BA] = 0xFE00_0000 (Right?)
> START_VECTOR = 0xFFF0_0100 
> 
> The span is START_VECTOR-BR0[BA] = 0xFFF0_0100 -
> 0xFE00_0000 = 0x1F00100 > 16M,
> So if my flash is 8M bytes, i can't use this
> configuration, right?

No. Just use it. No any problem to me. The fact
is that when you set BR0[BA] as 0xfe000000 the 
real flash 8MB will map to 32MB which is 
from 0xfe000000 to 0xfffffff. So the content of
0xfff00000 is the same as the one of 
0xfe700000/fef00000/ff700000. This is mirror theory:)

> 3)
> I pull-down the RSTCONF, it doesn't work, only with
> BDI2000 attached and config-file from BDI2000
> (RSTCONF
> up of cuz), U-BOOT can start correctly. 
> I.e. 

Seems the same problem I met. OK, just reprogram
the same image at 0xfff00000 again when RSTCONF pull
down and then disconnect BDI to power-on
to see what should happen:)

Best regards,

Sam


	

	
		
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