On Wed, Sep 30, 2009 at 1:20 PM, Bob Brusa <bob.brusa@gmail.com>
wrote:
Am 27.09.2009, 05:27 Uhr, schrieb Mandeep Sandhu
<mandeepsandhu.chd@gmail.com>:
Hi all,
I'm going to be using a real hardware for the first time (with
ECOS).
The h/w is the Atmel AT91SAM7X512 SoC.
In order to save RAM, i'll be running the code from the on-chip
flash
itself (512KB).
Now is it true that if my code resides on the flash, I will not be
able to write to it? I.e is the whole flash area is marked as
readonly?
Thanks,
-mandeep
Yes, its true. You will not be able to run tricks like self-
modifying code
that resides in flash. You would have to move such a routine to RAM
and
execute it there.
Ok, I'm confused now!
Andrew mentioned that I _could_ write to a different area of the flash
(i.e different from the one from where the code is running).
To give an example, say I have to do a firmware upgrade. Now I
download the image from, say an ethernet interface, and keep writing
chunks of it (since the whole firmware image won't fit in my RAM of
128KB) to a "well-known" safe area on the flash.