cd support for iBook G4

[Joerg Sommer <joerg@alea.gnuu.de>]

Hi,

I've an iBook G4 (combo drive):
$ cat /proc/cpuinfo 
processor       : 0
cpu             : 7455, altivec supported
clock           : 606MHz
revision        : 3.3 (pvr 8001 0303)
bogomips        : 610.30
machine         : PowerBook6,3
motherboard     : PowerBook6,3 MacRISC3 Power Macintosh
detected as     : 287 (iBook G4)
pmac flags      : 0000001b
L2 cache        : 256K unified
memory          : 256MB
pmac-generation : NewWorld

I can't read cds with cdrdao. It reads 9 second, sometimes 19 of the cd
and then hangs. Some seconds later the kernel reports:

ide-pmac lost interrupt, dma status: 8480
hdc: lost interrupt
hdc: status timeout: status=0xd0 { Busy }
hdc: status timeout: error=0xd0LastFailedSense 0x0d 
hdc: DMA disabled
hdc: drive not ready for command
hdc: ATAPI reset timed-out, status=0x80
ide1: reset timed-out, status=0x80
hdc: status timeout: status=0x80 { Busy }
hdc: status timeout: error=0x80LastFailedSense 0x08 
hdc: drive not ready for command
hdc: ATAPI reset timed-out, status=0x80

After this, cdrdao eats up my cpu. But cdrdao doesn't come to an end. The
time counter stays, but the file size grows, but very slowly. To read the
cd would take more than two hours (estimated).

When I kill cdrdao and run cdda2wav after, the hole system hangs and I
must do a reset.

After the kernel has reported it disables dma, hdparm still reports dma
is enabled. Is hdparm only a simulation?

I've also problems with burning cds. The speed is seldom more than 8
times and at most 12 times, but I never reached 24 times, what the
hardware should support.

Has anyone better experiences with the cdrom in the g4 ibook?

Jörg.

-- 
"Science is the game we play with God to find out what His rules are."