Re: How can I test my console driver?

[Antonino Daplas <adaplas@pol.net>]

On Tue, 2003-03-11 at 17:52, Alex Bennee wrote:
> I sent this to lkml but it probably got missed in the volume of mail.
> Can anyone point me anything that describes how I could test my console
> driver. Would it be the same approach for example as testing the vfb
> frame buffer driver?
> 
> -----Forwarded Message-----
> > Hi,
> > 
> > I'm writting a console driver for an embedded system for which the
> > hardware isn't quite ready yet. As a result I'm building on a PC with a
> > quickly hacked up proc interface so I can test the logic before the
> > final hardware.
> > 
> > On loading the module my code does the following:
> > 
> >     take_over_console(&sh_con, MAX_NR_CONSOLES - 1, MAX_NR_CONSOLES - 1,
> > 1);
> > 
> > Which I understand should associate my new console driver with the last
> > system console (63 in this case). Then to test the console output I do:
> > 
> >     echo "this is a test string" > /dev/vc/63
> > 

I think the above will not work.  You can only have 1 active console at
a time, so all inputs to an inactive console will be buffered.  Only
when you switch to that particular console that all pending commands
will be flushed. 

Why not just use take_over_console() with first and last equal to a tty
you can switch to?  If something bad happens, just switch to a working
console.

Tony




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