[U-Boot-Users] Question about MPC8272 HRCW

[raymond yang]

Still have questions, thanks ahead!

According to DATASHEET

"BMS -

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

or
-   Does this mean the BR0[BA] could be one of the
address between range 0XFE00_00000 and 0xFFFF_FFFFF,
if this is the case, so how can i determine the
specific value of BR0[BA]?

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?

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. 


Thanks ahead!

Best Regards
Raymond

 So With BMS=0, and CIP=0, my flash should be
> bigger
> > than 0xFFFn_nnnn - 0xFE00_00000 > 16M, right?
> 
> No. It just narrows your choose scope. If your FLASH
> on board hasn't reached 32MByte, you can fit the
> whole


--- Sam Song <samsongshu at yahoo.com.cn> wrote:

> raymond yang <raymond_yang95134 at yahoo.com> wrote:
> > 1) Given BMS = 0
> > Does this mean, the FLASH(on CS0) are given the
> base
> > address as 0xFE00_0000? 
> 
> Not exactly. 0xFE00_0000 is just one of workable 
> configuration.
> 
> > 2) Given CIP = 0
> > Does this meman, the vector should be placed at
> > 0xFFFn_nnnn?
> 
> Correct. This is HIGH BOOT location of 8272.
> 
> > So With BMS=0, and CIP=0, my flash should be
> bigger
> > than 0xFFFn_nnnn - 0xFE00_00000 > 16M, right?
> 
> No. It just narrows your choose scope. If your FLASH
> on board hasn't reached 32MByte, you can fit the
> whole
> FLASH space in the setting scope as you like.
> 
> > 3) Given my flash is 8M byte, 16bit-bus-width, is
> it
> > a valid HRCW word for 08_82_32_45
> > My image got the following configurations
> >  MONITOR_BASE=TEXT_ADDR=0xFFF00000 
> >  CFG_FLASH_BASE = 0XFE800000
> 
> Seems good. But CFG_FLASH_BASE = 0xff800000 is also 
> OK.
> 
> > I tried many times, with BDI plugged, u-boot works
> > fine.However, without BDI and RSTCN pull-up, looks
> >
> like the image never got run. 
> 
> Ummm, try to program the same image at 0xff800000
> and pull down RSTCN to see what would happen:-)
> 
> Best regards,
> 
> Sam
> 
> 
> 		
>
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