Re: [U-Boot-Users] Need clarification !!

Andrejs Cainikovs Wed, 18 Jun 2008 06:58:39 -0700

I'm afraid I can't tell you this because of your confidentiality disclaimer below.. But what the heck...

Amit Kumar wrote:

Hello Guys,

            I have one clarification related to PXA255 code in U-boot.

If in board/pxa255_idp/config.mk        TEXT_BASE = 0xa3080000 (this is RAM address in my board)

                        then because of –Ttext option (in u-boot/config.mk file), in U-boot.map file .text section starts from 0xa3080000 address.

                        So all the symbols like _start, _armboot_start get addresses with respect to 0xa3080000 address only.

                        I am using JFLASH to download the code in FLASH and running the code from FLASH. I am disabling that part of code which relocates the binary from FLASH to RAM.

Why you're disabling the relocation stuff? Without relocation you can run your code only from RAM (loaded by JTAG or internal loader via serial cable when flash is empty, for example).

What I don’t understand is when in MAP file all the symbols have addresses of RAM then after downloading in FLASH, how code is executing?

The relocation procedure (read: start.S) written in assembly and has relative jumps :-P

Regards

Amit Kumar

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Kind regards, Andrejs Cainikovs.

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Re: [U-Boot-Users] Need clarification !!

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