Re: Printing (Was: Re: Compiling problems with 2.4)

[Geert U. <ge...@li...>]

On Tue, 13 Feb 2001, Glenn Hisdal wrote:
> Frank Rudolf Georg Petzold wrote:
> > On Tue, Feb 13, 2001 at 11:41:20AM +0100, Ren? Thol wrote:
> > > And how do I compile a 2.4 kernel that can use my printer on the
> > > parallel port?
> > 
> > There is no way. Parallel port support is broken in 2.4. Use 2.2 instead.
> 
> I did some tests with printing yesterday.
> If I enable DEBUG in drivers/parport/parport_amiga.c, 
> printing works.
> The only problem is that a page containing only one letter is printed
> out after it's done with what it was supposed to print out.
> 
> Without DEBUG disabled it only prints garbage (when printing postscript
> files).
> 
> So, I thought maybe it tried to send data faster than the Amiga
> parallell port (or the printer) could handle or something. (since
> writing the debug output will add a short delay)
> 
> So, I turned off DEBUG and added a for-loop inside
> amiga_write_control(..)
> to add a small delay, and printing still worked...
> 
> Timing problem ?

What happens if you replace the DPRINTK(...) by mb()?

The fact that it works for some people could be attributed to the CPU (603e vs.
604e).

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@li...

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds