Re: [U-Boot-Users] Boot from NAND FLASH

jiale.Yin Mon, 19 May 2008 05:13:55 -0700

Thank you for your answer. But as you said in the letter, "NOR can be mapped in 
its entirety, while with NAND only the first 4KiB gets
mapped, and that code has to fetch the rest of u-boot from NAND and copy it to 
RAM before continuing." Why did you also mentioned that there is no need to 
modify the start.s, isn't there any difference between booting from NOR and 
NAND for start.s?

2008-05-19 

jiale.Yin 

发件人： Scott Wood 
发送时间： 2008-05-17  03:16:52 
收件人： jiale.Yin 
抄送： u-boot-users 
主题： Re: [U-Boot-Users] Boot from NAND FLASH 

On Fri, May 16, 2008 at 02:54:34PM +0800, jiale.Yin wrote:
> Our board is reference with the mpc8313erdb,and its design is to link CS0
> to the NAND FLASH, so I have to boot from NAND other than NOR.In
> /board/mpc8313erdb I can find some files, such as nand_boot.c, nand.c and
> nand_ecc.c,

I assume you're talking about the Freescale BSP, as those files are not in
mainline u-boot.

> which I think are related with booting from NAND.What I want
> to know is if booting from NAND,is there any need to modify the start.s

No, beyond what's already been changed in the BSP to support it.  Make sure
you use a NAND configuration when building u-boot.

> and what is needed to ba added. What's the difference between NOR-BOOT and
> NAND-BOOT. Thank you!

NOR can be mapped in its entirety, while with NAND only the first 4KiB gets
mapped, and that code has to fetch the rest of u-boot from NAND and copy it
to RAM before continuing.

-Scott

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Re: [U-Boot-Users] Boot from NAND FLASH

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