[U-Boot] questions on SPL

[Lukasz Majewski <lukma@denx.de>]

On Wed, 13 Dec 2017 22:20:57 +0800
herbert <yuanjp@hust.edu.cn> wrote:

> Hi
> 
> I am very sorry to ask this simple question. I read a lot of document 
> and googled online, but I still feel puzzled by the SPL of U-Boot.
> 
> 
> I has an ancient SoC s3c2440 which is armv4t architecture. s3c2440
> will copy the first 4K code on NAND to static SRAM. It is obvious
> that u-boot bin is bigger than 4K. so Here is my question:
> 

It is very unlikely that the 4K that you load is the SPL.

It may be a bl1 image, which is crafted by SoC vendor and needs to be
signed.

I can only recommend looking on the old u-boot from the board BSP and
check what is going on.

IIRC the s3c2440 is not supported by u-boot anymore.

> 1. In this condition, do I must compile a SPL bin？ and flash it to
> the first page of NAND flash. if it's, I think the SPL should be less
> than 4K, or it's meaningless, It still need to copy remain content,
> and has no difference with a single u-boot.
> 
> 2. can I only compile a regular u-boot and do copy work and relocate 
> work at this single u-boot. namely, merge SPL and regular u-boot,
> does u-boot support this framework?
> 
> 
> thanks very much!
> 
>  From 袁建鹏 (Yuan Jianpeng)
> 
> 
> 
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> U-Boot at lists.denx.de
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Best regards,

Lukasz Majewski

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