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SubjectRe: More parport troubles
On Fri, 17 Apr 1998, Tim Waugh wrote:

>> Anyway, in 2.1.88 with IRQ 8 seems to work fine.
>Er.. really? Is lp actually interrupt-driven for you in 2.1.88?

Well, that's what /proc/parport/0/hardware sais:

base: 0x378
irq: 8
dma: none

And on booting I get:

<6>parport0: PC-style at 0x378, irq 8 [SPP,ECPEPP,ECPPS2]
<6>parport0: no IEEE-1284 device present.

>> Well, I'm puzzled why 2.1.88 uses IRQ 8 and it even works with it. Let
>That 2.1.88 uses IRQ 8 isn't so surprising - that it works is.

On a second thought, seems like it still uses polling, even if it
lists the irq in /proc. The counter in /proc/interrupts doesn't
increase when I print something:

0: 12095045 XT PIC timer
1: 110379 XT PIC keyboard
2: 0 XT PIC cascade
3: 7 XT PIC serial
4: 1863925 XT PIC serial
5: 248340 XT PIC SoundScape
8: 0 XT PIC parport0
9: 2 XT PIC SoundScape
11: 1909153 XT PIC aic7xxx
12: 517581 XT PIC PS/2 Mouse
13: 1 XT PIC fpu
15: 42328 XT PIC ide1
NMI: 0

Only "parport0" changed to "lp" and back a few times while it was printing

The best defense against logic is ignorance.

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