[U-Boot-Users] Memory Bank x (nothingness)?

[Vladimir Gurevich <vag@paulidav.org>]

Hi Jerry,

I also have Walnut-based board, but found that it is much easier to 
use OCM instead. 

Here is a relevant piece of my config file:

/* use on chip memory ( OCM ) for temperary stack until sdram is tested */
#define CFG_TEMP_STACK_OCM        1

/* On Chip Memory location */
#define CFG_OCM_DATA_ADDR	0x50000000
#define CFG_OCM_DATA_SIZE	0x1000

#define CFG_INIT_RAM_ADDR	CFG_OCM_DATA_ADDR 
#define CFG_INIT_RAM_END	CFG_OCM_DATA_SIZE

Happy hacking,
Vladimir


Jerry Walden wrote:
> Greetings -
> 
> I have a custom PPC405GPr board, and I am trying to bring u-boot up on it.
> 
> 	/*-----------------------------------------------------------------------
> */
> 	/* Setup temporary stack in DCACHE or OCM if needed for SDRAM SPD. */
> 	/*-----------------------------------------------------------------------
> */
> 	/*-----------------------------------------------------------------------
> */
> 	/* Memory Bank x (nothingness) initialization 1GB+64MEG */
> 	/* used as temporary stack pointer for stage0  */
> 	/*-----------------------------------------------------------------------
> */
> 	li	r4,PBxAP
> 	mtdcr	ebccfga,r4
> 	lis	r4,0x0380
> 	ori	r4,r4,0x0480
> 	mtdcr	ebccfgd,r4
> 
> The Walnut config has CFG_INIT_DCACHE_INIT_CS = 4
> 
> In our custom board do not have anything attached to bank 4 -
> 
> Does DCACHE for the processors cache or programmers private use?
> How can I (or how should I) re-write/add/subtract the above code to
> accomplish
> what it is trying to do (which is not clear to me).
> 
> Thanks
> 
> Jerry Walden
> 
> 
> 
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