[hpoj-devel] 2.4 kernel issues

[Burkhard K. <bu...@bu...>]

Hi everyone,

I tried to get hpoj-0.7 running with kernel 2.4.0-test12. I encountered
the same compiler errors someone else reported earlier to this list.
But after changing the ieee12844pp.c module accordingly (define 
PARPORT_CONTROL_DIRECTION, substitue parport_write_econtrol, and 
substitute queue_task(tq_scheduler) with schedule_task) I was not
able to run anything but ./hpo devid. ./hpo listpml would yield 
error -100 in mlcpp_intr and scanimage MLCError 7.

I thus tried to replace parport_write_econtrol with the original
code (outb(PAR_ECP_CONTROL_BIDIRECTIONAL 0x34, ECONTROL(l->port))
since using parport_write_control (as recommended by the original
poster) was not very sensible. This did not change the outcome.

With debugging turned on in ieee12844pp.o I see the following
log for ./hpo listpml:
	do_neg(c5067d9c,mode=0x04): in_1284=0, neg_mode=0x10.
	c5067d9c: event=2.
	c5067d9c: event=6.
	negotiate(c5067d9c,mode=0x04): rejected!
	mlcpp0: mlcpp_intr ERROR -100
	state=2 event=6 reset=1 recv=4 rcv=0 send=2
	do_neg(c5067d9c,mode=0x00): in_1284=1, neg_mode=0x04.
	c5067d9c: event=23.
	PAR_WAIT_SET_CLEAR(l=c5067d9c,set=0x0088,clear=0x0050):
		timed out waiting for event=23!

One further note on compiling the modules. The recommended compiler
for 2.4.0 kernels is now egcs 1.1.2. But with many distributions 
comes gcc 2.95.x. linux/Documentation/Changes strongly recommends
to use 2.95 with the -fno_strict_aliasing flag. I therefore suggest
to add an EXTRA_CFLAGS=-fno_strict_aliasing field to the makefile, 
which might be uncommented by gcc 2.95.x users.

Burkhard
-- 
Burkhard Kohl			bu...@bu...