Re: FW: [avrdude-dev] Windows port (was: Butterfly proposal: Exit upgradefunction)

[Jan-Hinnerk Reichert]

On Monday 09 February 2004 17:39, E. Weddington wrote:
> On 8 Feb 2004 at 12:17, Jan-Hinnerk Reichert wrote:
> > On Friday 06 February 2004 22:14, E. Weddington wrote:
> > > On 6 Feb 2004 at 2:22, Jan-Hinnerk Reichert wrote:

> > > > BTW: The FIFO-thresholds can be adjusted in Device-Manager
> > > > (hope this is the right term). Although it doesn't say so,
> > > > WinXP needs a restart before changes take effect ;-(
> > >
> > > Why would it need to restart? I don't think Win2000 needs a
> > > restart, but I'll do some checking.
> >
> > I can't see a reason. Perhaps it was, because I still had the
> > command.exe running while doing the change. Or windows just
> > forgot to apply the changes ;-(
>
> Oh, I bet you that's it! Definitely close the command line box
> before making the changes. It does not automatically grab those
> changes when running.

It's not this way. If I close it and open a new one the changes don't 
take effect. And technically changing the FIFO-threshold is just a 
single "out"-command, no OS stuff ;-)
IMHO the only reason would be, that Windows refuses to set the value, 
because the command.com holds a lock or something like this...

> > However, it is quite nice that you can change FIFO-settings in
> > Windows. You can't do that with Linux, unless you patch and
> > recomile the kernel. (Did I just say that Windows does something
> > better than Linux?)
>
> Well, hey! Now you have an idea for a patch for Linux! Go for it!
> ;-)

I have already changed the value in my kernel once, it's quite easy. 
The hard stuff is making an interface to user space or at least 
implementing a boot-option.
Writing a program for directly changing the FIFO is not feasable (even 
with root privileges), since Linux sets FIFO-threshold everytime the 
baudrate is set ;-(

I won't bother the kernel people with this, because
- it might be implemented in 2.6 (perhaps I will take a look 
sometimes)
- I might switch to BSD (at least I'm done with SuSE)
- I will try building an USB-prommer as soon as the new FTDI-chips are 
available and I have the time ;-)

Cheers
  Jan-Hinnerk