[ECOS] ROMRAM Application on xScale (PXA255)

[Mark Salter]

On Fri, 2006-03-24 at 13:49 -0500, Joe Porthouse wrote:
> Mark/All,
> 
> 	Thanks for the reply.  I did not find any ROMRAM support in the
> IXDP425 (..._ixdp425_romram.ldi or other support files), but I did find some
> in the uE250 target platform.

Its in CVS...

> 	I believe I have found all the references I needed to update but I
> am still running into problems getting the application to run.
> 
...

> 	With the ROMRAM startup type the "ldr r2,1f" loads r2 with
> 0x00000xxx, the RAM address to continue execution.  Problem is that the
> image is not copied from flash to RAM until later in the startup.  Execution
> is suppose to continue in flash at 0x50000000.

...and the ixdp425 port deals with this issue thusly:

	// value to load into pc to jump to real runtime address
	ldr     r0, =1f
#if defined(CYG_HAL_STARTUP_ROMRAM)
	// R0 holds a RAM address for ROMRAM startup,
	// so convert to a flash address.
	orr	r0, r0, #IXDP_FLASH_BASE
#endif

--Mark



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