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Re: redboot startup mode
Quoting Gary Thomas <gary@mlbassoc.com>:
Please reply to the eCos mailing list so that all may benefit. Private
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I'm Sorry.
On Tue, 2005-05-24 at 17:58 +0100, yrodguez@iuma.ulpgc.es wrote:
But, who exactly have to copy redboot code from flash to ram?, I'm
Look in the platform startup code:
<ecos>/packages/arm/arm9/excalibur/current/include/hal_platform_setup.h
My question is: do i need another startup code, different to redboot, to use
this mode or is enough with redboot?
thanks, and, I'm sorry again.
sorry, maybe
i don't understand it due to my bad level in english
thanks.
Quoting Gary Thomas <gary@mlbassoc.com>:
> On Tue, 2005-05-24 at 17:41 +0100, yrodguez@iuma.ulpgc.es wrote:
>> hi,
>> i have a doubt/question?
>>
>> i'm trying to compile a redboot in romram mode.
>>
>>
>> At http://sources.redhat.com/ecos/docs-latest/redboot/excaliburarm9.html
>>
>> say that romram mode runs redboot from ram with redboot in flash.
I supossed
>> that redboot is stored in flash memory and then it is copied from
>> flash to ram.
>> But when i desassemble the file i get the code is mapped on ram (0x8000):
>>
>
> Correct. It has to be that way - the linker produces an image suitable
> for running from RAM. That said, the image will be stored in FLASH
> (typically this is all that's accessible immediately after RESET). The
> program [RedBoot or whatever] then does some minimal hardware
> initialization, e.g. turning on the SDRAM controller, setting up mapping
> registers, etc. The code is then copied from FLASH to its ultimate RAM
> destination and control is then passed there. Now you are running from
> RAM only. It's up to the startup code to understand all of this and
> it must contain [normally position-independent] code that performs these
> steps at startup.
>
> Note: this mode is only suitable for *the* initial "ROM" monitor code,
> like RedBoot. This is not how you would write a generic program which
> runs in RAM but whose image was stored in FLASH. For that, you use
> RedBoot's FIS commands (create, load)
>
> --
> ------------------------------------------------------------
> Gary Thomas | Consulting for the
> MLB Associates | Embedded world
> ------------------------------------------------------------
>
>
--
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Gary Thomas | Consulting for the
MLB Associates | Embedded world
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