Re: [ECOS] redboot startup mode

[yrodguez@iuma.ulpgc.es]

Quoting Gary Thomas <gary@mlbassoc.com>:

> Please reply to the eCos mailing list so that all may benefit.  Private
> support is available under contract (from MLB Associates or others)

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
>> > ------------------------------------------------------------
>> >
>> >
>>
>>
> --
> ------------------------------------------------------------
> Gary Thomas                 |  Consulting for the
> MLB Associates              |    Embedded world
> ------------------------------------------------------------
>
>




-- 
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss