[En-Nut-Discussion] Fuses

[Harald Kipp]

Roger,

here's a copy of my response I sent yesterday via
private email. Looks like you didn't receive it.

Harald

>Hi Roger,
>
>
> >Hello,
> >After programming my Ethernut 2.0 ATmega128 flashmemory with AVRStudio 
> 4.07 I got the message:
> >\"Flash contents differs from file\"
>
> >...and there is a questionmark at fuses-tab at the point:
> >serial program downloading (SPI) enabled; [SPIEN=0]
>
>This is normal. SPIEN=0 means, SPI is enabled. Fuses are
>programmed to 0 and deleted to 1. Luckily it is not
>possible to change the SPI fuse via SPI, that's why Atmel
>may have used the question mark.
>
>
>
> >I was programming a DAC connected to SPI when the problem occured.
>
> >Does this mean that any further ISP programming is not possible?
> >Can I solve this problem with a JTAG programmer?
>
> >Is there any solution for this problem?
>
>
>Worst thing you can do with SPI is to disable the
>crystal oscillator. Please take a look at
>
>http://www.ethernut.de/en/faq.html
>
>and
>
>http://www.ethernut.de/en/isp/index.html
>
>for more information. Please come back to me if you can't
>solve the problem.
>
>Kind regards,
>
>Harald