From mboxrd@z Thu Jan  1 00:00:00 1970
From: Zhong Hongbo <bocui107@gmail.com>
Date: Tue, 04 Sep 2012 22:03:07 +0800
Subject: [U-Boot] [v3] arm: Fixed the offset for the no relocation.
In-Reply-To: <201209030214.32639.marek.vasut@gmail.com>
References: <1346568592-6832-1-git-send-email-bocui107@gmail.com>
	<201209030214.32639.marek.vasut@gmail.com>
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On 03/09/12 08:14, Marek Vasut wrote:
> Dear Zhong Hongbo,
> 
>> From: Zhong Hongbo <bocui107@gmail.com>
>>
>> When the u-boot address of destination equal to  __start,
>> no relocation. relocation offset(r9) = 0.
> 
> Good, now what kind of issue does this patch fix?
Hi Marek

When you adopt CONFIG_SPL_BUILD framework, no CONFIG_NAND_SPL, if the
addr of destination is equal to _start, we should skip u-boot relocation.

In the last, u-boot will count the dest addr, see the below:


        adr     r1, _start
        add     lr, r0, r1
        add     lr, lr, r9

Here, lr = lr + r9, r9 is the offset of u-boot, So when it do not neet
to reolocat, we need to set the zero value for r9 register.

        /* setup parameters for board_init_r */
        mov     r0, r5          /* gd_t */
        mov     r1, r6          /* dest_addr */
        /* jump to it ... */
        mov     pc, lr

Thanks,
hongbo


> 
>> Signed-off-by: Zhong Hongbo <bocui107@gmail.com>
>> ---
>> Change for V3:
>> 	- Drop the change of arm720t, It has already merge the change.
>> Change for V2:
>> 	- Clean a line for arm1176.
> 
> [...]
> 
> Best regards,
> Marek Vasut
>