[U-Boot] Uboot 4K Page Jump in MPC85xx

[Vignesh Kumar B]

Hi,

As am I going through the MPC85xx reset.s code, I find this code snippet
below.
I find the Config_sys_monitor is the Text_Base Address in loaded in r3,
The Start Offset is zero, I am not getting why we are subtracting the
start_cont with start and that addr is loaded in the link register where
we jump to.

So what does the address actually refer to? Please Explain.

/* Jump out the last 4K page and continue to 'normal' start */
#ifdef CONFIG_SYS_RAMBOOT
	b	_start_cont
#else
	/* Calculate absolute address in FLASH and jump there
*/
	
/*--------------------------------------------------------------*/
	lis	r3,CONFIG_SYS_MONITOR_BASE at h
	ori	r3,r3,CONFIG_SYS_MONITOR_BASE at l
	addi	r3,r3,_start_cont - _start + _START_OFFSET
	mtlr	r3
	blr
#endif

_Start:
..
..
..
_start_cont:
..
..
..

Thanks & Regards,
Vignesh Kumar B
Member Technical Staff
HCL TECHNOLOGIES LTD.,
Mob: +91-9600015988
www.hcl.in


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-----Original Message-----
From: u-boot-bounces at lists.denx.de [mailto:u-boot-bounces at lists.denx.de]
On Behalf Of Stefan Roese
Sent: Wednesday, November 19, 2008 10:12 AM
To: u-boot at lists.denx.de
Subject: Re: [U-Boot] [PATCH] [UBI] UBI command support (take #2)

On Wednesday 19 November 2008, Kyungmin Park wrote:
> > Could you please summarize the current state of adding UBI support?
>
> Not much as before,
>
> 1. Basic UBI command support.
>    read/write/update volume. Of course you can create & remove the
volume.
> 2. Send ubi device from environment variables instead of hard code
value.
>
> I saw the NOR device support patch but not yet tested.
>
> Are there the more?
>
> > Is it correct to assume we are targetting the 2008.12 release with
> > this stuff?
>
> Yes, I hope to merge it ASAP.

I'll post some last-minute UBI fixup patches soon (this week).

Best regards,
Stefan

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