Re: [avr-gcc-list] bootloader

[Torsten Mohr]

Hi,

browsing through the sources of avrdude, i found that erasing a
chip is repeated up to 5 times until the chips flash is erased.
So the erase command is not only performed ONCE, but up to
five times.

Is the same necessary or useful when from within a bootloader?


Programming bytes seems to be done only once, is that correct?
Does it make sense to repeat the programming of bytes (is that
even possible)?


Best regards,
Torsten.


> Hi,
>
> the bootloader i write at the moment basically works, but i experience the
> problem that erasing/programming sometimes fails when programming
> with my own bootloader.
>
> When programming via avrdude via the parallel port, all works fine.
>
> So now i wonder if my strategy for erasing/programming is wrong.
>
>
> 1. In the documentation in avr-libc-usermanual-1.2.3 it says
> boot_page_erase(page).  It should say boot_page_erase(address),
> is that right?
>
> 2. I only call erase/program once and i verify the erase/program
> directly after that.  Can this be a problem?
>
>
> What else could be a problem when just using the supplied functions
> in avr-libc-1.2.3?  Should it work exactly the same as with avr-dude
> via parallel port?
>
>
> Best regards,
> Torsten.
>
>
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