[RULE] cdrom mount problem

[Ingo Lantschner (Lists)]

Graeme Jones wrote:

> hdc: ATAPI 8X CD-ROM, ..., DMA
> hdc: DMA interrupt recovery
> hdc: lost interrupt
> hdc: lost interrupt
> hdc: timeout waiting for DMA
> hdc: timeout waiting for DMA
> hdc: (__ide_dma_test_irq) called while not waiting

sounds familar to me, have a look into the vumBOX-handbook
(http://www.rule-project.org/breve.php3?id_breve=6)

Here is an excerpt:

11. Troubleshooting&Tipps
*>>During setup (or during normal use) you have problems writing or 
reading from the harddrive or CD-ROM.

The machine may have proplems with DMA. During startup try to hit 
immediatly when the OS-selection-screen opens Ctrl+x and start Linux 
with the option 'ide=nodma'
(Type at the prompt: linux ide=nodma )



*>>My computer can not use DMA on the CD-ROM but the harddrive would 
profit from the performancewin DMA allows. How can I enable DMA on my 
harddisk and disable it on the CD-ROM?

Make sure to start your computer with DMA turned on (do not type linux 
ide=nodma) There are files in /etc/sysconfig which control 
HD-parameters. Provided that your harddisk is hda and the CD-ROM is hdc 
you must do:

# vi /etc/sysconfig/harddiskhda
add the line: 'USE_DMA=1' and save the file (ESC :wq)
# vi /etc/sysconfig/harddiskhdc
add the line: 'USE_DMA=0' and save the file (ESC :wq)

After rebooting the system you can check the DMA-status with
# /sbin/hdparm -i /dev/hda

Good luck, and let us know if it worked out.
-- 
Ingo Lantschner
T (+43-1) 59 55 766
M (+43-664) 143 84 18

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