[En-Nut-Discussion] at91sam7x bloader

[Alain M.]

I don't have have it here to look at, but you can also have a look at 
the IPL.

It is very well structured, so you can probably change it so that the 
boot loader works at the begining of the IPL, or something like linking 
the whole program for another address like 0x5000 or the end of flash, 
and the boot loader at 0x4000 and it continues the IPL once it is done.

Or maybe the IPL can call the bootloader (at the end of the flash) to 
check for an update

If you want to discuss it further, feel free to call in PVT, I am 
interested because I will need to do something like that too :)

Alain


Szemző András escreveu:
> Hi,
>  
> I would like to update my firmware on a sam7x board from web. With AVR it's
> not too difficult, but I don't know ARM7 remapping and linker scripts enough
> yet for it.
>  
> I've got a dataflash connected to at91, so the method will be to upload the
> new firmware from web, store in the dataflash, reboot, and a bootloader will
> update the firmware from dataflash if it needs.
>  
> I have no problems with dataflash, internal flash, web side, my only problem
> is the bootloader. It will live in the 0x0 address, and Nut app will be at
> 0x4000 for example.
> In this case I need to modify the the at91sam7x_ram.ld script to place Nut
> app at address 0x4000, right?
> But how I need to setup the bootloader's .ld script. and if I upload the
> internal flash from dataflash, I need to simply jump to address 0x4000, or
> what? :)
>  
> Thanks your help.
>  
> Regards,
> Andras
>  
>  
> 
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