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Re: Can I assign the offset of code start in redboot.binwhen using startup from ROM
- From: Gary Thomas <gary at mlbassoc dot com>
- To: Steven_cheng <05071 at alphanetworks dot com>
- Cc: eCos Discussion <ecos-discuss at ecos dot sourceware dot org>
- Date: Thu, 07 Jul 2005 04:40:03 -0600
- Subject: Re: [ECOS] Can I assign the offset of code start in redboot.binwhen using startup from ROM
- References: <01fa01c582d7$28c64870$016ffea9@stevencheng>
On Thu, 2005-07-07 at 17:35 +0800, Steven_cheng wrote:
> Hi All,
>
> Environment:
> arch: MPC8245
> package: RedBoot
> startup type: ROM
>
> After building the code, I burn the the redboot.bin into my rom flash, but
> it
> seems not to be executed. Then I found that the code offset starts in 0x0,
> not
> in 0x100, in the redboot.bin. The MPC8245 can not start from offset 0x100
> to execute the rom code. So the rom code is failed.
>
> Questions:
> 1) The MPC8245 rom code should start from 0x100 in redboot.bin for
> burning.(???)
> 2) Does anybody know how I can move the code offset start from 0x0 to
> 0x100 ??
> 3) Does the code start from the _start in the vector.S for startup type
> "ROM" ??
>
> It was as following:
>
> 0x00000000 rom_code _start # map to _start in vectors.S
> 0x00000010 rom_code
> 0x00000020 rom_code ......
> ...
> 0x00000100 rom_code ......
> ......
>
>
> But I think it should be as following:
>
> 0x00000000 Vector
> 0x00000010 empty
> 0x00000020 empty
> ...
> 0x00000100 rom_code _start ......# map to _start in vectors.S
> ......
>
> 4) Is it correct ??
>
How did you configure eCos? (i.e. what commands/steps did you use?)
You can see how the image is laid out in memory using this command:
powerpc-eabi-objdump -h install/bin/redboot.elf
What do you see from it?
--
------------------------------------------------------------
Gary Thomas | Consulting for the
MLB Associates | Embedded world
------------------------------------------------------------
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