On Fri, Sep 18, 2009 at 2:36 PM, Juergen Harms wrote:
Atmel evidently expects that either the bootloader is used
more or less exclusively, or the programming mechanism
- but not the kind of combination I had considered.
Then, on Friday, September 18, 2009 to 6:00 PM, Peter LaDow wrote:
I guess I didn't really understand your requirement. But the above
seems to be a bit inaccurate. <snip>
What Juergen means, I think, is that when you change the application program
in a device, you either have a bootloader or you use a hardware programming
mechanism such as ISP, JTAG or (heaven forbid) High-Voltage. With a
bootloader, you have a lot of freedom about what gets erased and what gets
preserved, but with a hardware programming mechanism you generally start
with a chip erase which wipes the entire Flash. What Juergen wanted, if
I've been following correctly, is for a hardware re-program to leave the
contents of the boot loader section alone so that he could squirrel away his
"individualizations" there.
Graham.
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