Bug 49177 - Installer has long timeouts accessing IDE CD-ROM
Installer has long timeouts accessing IDE CD-ROM
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
i686 Linux
medium Severity medium
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Assigned To: Arjan van de Ven
Brock Organ
Depends On:
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Reported: 2001-07-16 12:12 EDT by G. Bersano
Modified: 2007-04-18 12:34 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2001-07-18 05:37:49 EDT
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Description G. Bersano 2001-07-16 12:12:37 EDT
Description of problem:
During intallation process system seems to hang (ALL is frozen);
effectively it only is a loooong time out due to DMA.

How reproducible:

Steps to Reproduce:
1. mount /mnt/cdrom


Actual Results:  After minutes the system returns to life

Expected Results:  Immediate rensponse.

Additional info:

System is compaq deskpro (Pentium III Katmai, 450 Mhz).
Upgraded to kernel- but no results.

with latest kernel dmesg reports these relevant informations:

hdd: set_drive_speed_status: status=0x51 { DriveReady SeekComplete Error }
hdd: set_drive_speed_status: error=0xb4
hdd: ATAPI 48X CD-ROM drive, 128kB Cache, DMA
Uniform CD-ROM driver Revision: 3.12
hdd: timeout waiting for DMA
ide_dmaproc: chipset supported ide_dma_timeout func only: 14
scanning for RockRidge behind XA attributes
ISOFS: changing to secondary root
hdd: timeout waiting for DMA
ide_dmaproc: chipset supported ide_dma_timeout func only: 14

If I disable DMA on that device (/sbin/hdparm -d0 /dev/hdd)
the problem disappears.

The drive, as identified by /proc/ide/hdd/model is an
(maybe LG?)

Question: is this - NO DMA - the best setup or is it possible to try any
option to use again DMA?
Comment 1 Arjan van de Ven 2001-07-18 05:37:45 EDT
I've not seen better options than disabling the DMA on the drive. This error
usually is a drive advertising DMA support but not actually supporting it; but
once in a while it's a bad cable.
Comment 2 G. Bersano 2001-07-18 06:13:39 EDT
Thanks, I'll stick with NO DMA as I don't think it's a bad cable.
Maybe add this CRD-8480B to the no-dma list ?
Comment 3 Arjan van de Ven 2001-07-18 06:27:14 EDT
Yup agreed; I just added it

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