at91sam7s256 boot from external mem(flash,rom,...)

Microchip in-system programming solution: SAM-BA

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m_nabi
Posts: 12
Joined: Wed Nov 10, 2010 7:59 am

at91sam7s256 boot from external mem(flash,rom,...)

Mon Jan 31, 2011 9:15 am

hello,my friends!!

I design an module with at91sam7s256.
I want to boot it from external memory,it means that I the chip must execute code from external memory instead of internal NAND flash,without any need to write some code on internal nand flash;

for example is there any way to change boot order once and use it for other times without need to set it every time;

exactly I want to write a code similar to sam_ba on external flash , and chip must boot from it directly,and then i can control it.

thanks a lot for your attention and response!
CptTitanic
Posts: 871
Joined: Sat Oct 30, 2010 6:04 pm

Re: at91sam7s256 boot from external mem(flash,rom,...)

Tue Feb 01, 2011 2:43 am

Pretty sure the 7s256 isn't as flexible in this regard as the AT91SAM9xxx series, and has a less function rich boot ROM.

This wouldn't however preclude you from creating as small bootloader in flash that would set up the external memory interface, and jump to your code, etc.

While this might not be the solution you want, it would be fairly easy/viable to implement.

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