interrupts

[Matthew Whillock <mcrw@mssl.ucl.ac.uk>]

Hi all,

I am using rtlinux 2.2 and have come across a couple of problems...

When I try to get the sound example program going (by make; make test
as root) I get the error message "permission denied" when the line
'cat linus.au > /dev/rtf3' executes. Any ideas why this should be?
ls -l /dev/rtf3 returns

crw-rw-rw-   1 root     root     150,   3 Apr 19  2000 /dev/rtf3


I am developing my own module which uses interrupts 5 and 7. I think
I have enabled interrupt 7 correctly as folowing (STATUS_INT is defined
as 7):

#ifdef USE_INTS
	case 4 :	// mdp_enbl_stint
	  rtl_no_interrupts(old_irq_state);

	  //	  debug = rtl_request_global_irq(STATUS_INT, status_handler);
	  debug = rtl_request_irq(STATUS_INT, status_handler);

	  if(debug == 0) {
	    rtl_hard_enable_irq(STATUS_INT);
	    // next line initializes own hardware card
	    outb(ST_STAT_WR_CLR_STIRQ_B | ST_STAT_WR_EN_STIRQ_B, ST_STAT_RW);
	    rtl_allow_interrupts();
	  }

	  rtl_restore_interrupts(old_irq_state);

#ifdef DEBUG
	  rtl_printf("CONTROL_HANDLER: status int %d\n", debug);
#endif

	  break;


A logic analyser trace tells me that the interrupt is being generated by
the hardware under test in the isa slot but is not being picked up by rtl.
In the bios I have reserved interrupts 5 & 7 as ISA legacy.

I have tried rtl_request_global_irq and rtl_request_irq with no joy.

Can anyone point me in the right direction?

TIA

Cheers,

Matt W.
-- 
 						   Matthew Whillock
mcrw@mssl.ucl.ac.uk			  Dept. of Space and Climate Physics,
Tel: +44 1483 204181			   Mullard Space Science Laboratory,
Fax: +44 1483 278312			      University College London.