[U-Boot] CFI interface and PPC440EP EBC chipselects

[U-Boot] CFI interface and PPC440EP EBC chipselects

[Stevan Saban]

Hi,

 

I am porting u-boot to a PPC 440EP custom board that is very similar to
Yosemite. 

I have two chips (32 MB each) of NOR flash running through ECB at CS0
and CS1 and using the CFI interface.

 

I was wondering where u-boot maps the chip selects so that multiple
flash chips can be used.

I have one bank running (CS0 copied from Yosemite port) but would like
access to both.

 

Thanks

 

[U-Boot] CFI interface and PPC440EP EBC chipselects

[Stefan Roese]

Hi Stevan,

On Monday 19 April 2010 22:32:56 Stevan Saban wrote:
> I am porting u-boot to a PPC 440EP custom board that is very similar to
> Yosemite.
> 
> I have two chips (32 MB each) of NOR flash running through ECB at CS0
> and CS1 and using the CFI interface.
> 
> 
> 
> I was wondering where u-boot maps the chip selects so that multiple
> flash chips can be used.
> 
> I have one bank running (CS0 copied from Yosemite port) but would like
> access to both.

You need to configure the CS1 EBC settings in your config header correctly for 
this:

#define CONFIG_SYS_EBC_PB1AP	your-values
#define CONFIG_SYS_EBC_PB1CR	...

And then add the 2nd FLASH chip to the FLASH list in the same config header. 
Something like this:

#define CONFIG_SYS_FLASH_BANKS_LIST     { 0xfc000000, 0xfe000000 }

Cheers,
Stefan

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