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SubjectRe: 2.4.21-rc5: DMA disabled for IDE Cdrom, works with 2.4.20
> 
>> CONFIG_IDEDMA_PCI_AUTO=y
>
> Please disable 'Use PCI DMA by default when available'
> (CONFIG_IDEDMA_PCI_AUTO) in your kernel config, enable DMA with hdparm
> after bootup and report back.
>
>> CONFIG_BLK_DEV_IDEDMA=y
>> CONFIG_BLK_DEV_ADMA100=y
>> CONFIG_BLK_DEV_PIIX=y
>
> The above should fix your hangs.
>
>
> HTH,
> Carl-Daniel

I have now disabled "CONFIG_IDEDMA_PCI_AUTO" such that initially DMA is
disabled for /dev/hda and /dev/hdb. I have then enabled DMA only for
/dev/hdb with hdparm (keeping DMA disabled for /dev/hda) but the problem
persists and DMA for /dev/hdb will be disabled when I try to mount a
cdrom. It seems that the DMA-setting for /dev/hda has no influence on
this.

Actually, I forgot to mention that the dmesg-output I have put in my
former message corresponds actually to the case with both
CONFIG_IDEDMA_PCI_AUTO and CONFIG_IDEDMA_ONLYDISK enabled such that at boot
DMA is enabled for the harddisk but not for the CDrom and I used hdparm to
enable it for the latter.

Here the diff of dmesg before and after the modification:
---------------------------------------------------------
1c1
< Linux version 2.4.21-rc5 (frahm@albireo) (gcc version 3.2.2) #1 Tue May 27 22:
40:09 CEST 2003
---
> Linux version 2.4.21-rc5 (frahm@albireo) (gcc version 3.2.2) #2 Wed May 28 01:
27:23 CEST 2003
17c17
< Detected 501.146 MHz processor.
---
> Detected 501.144 MHz processor.
88d87
< blk: queue c038ec20, I/O limit 4095Mb (mask 0xffffffff)
92c91
< hda: 26564832 sectors (13601 MB) w/2048KiB Cache, CHS=1653/255/63, UDMA(33)
---
> hda: 26564832 sectors (13601 MB) w/2048KiB Cache, CHS=1653/255/63
-----------------------------------------------------
and here "dmesg | grep hd" (after modification)
-----------------------------------------------------
ide0: BM-DMA at 0xb800-0xb807, BIOS settings: hda:DMA, hdb:DMA
ide1: BM-DMA at 0xb808-0xb80f, BIOS settings: hdc:pio, hdd:pio
hda: WDC WD136AA, ATA DISK drive
hdb: SONY CDU4811, ATAPI CD/DVD-ROM drive
hda: attached ide-disk driver.
hda: host protected area => 1
hda: 26564832 sectors (13601 MB) w/2048KiB Cache, CHS=1653/255/63
hdb: attached ide-cdrom driver.
hdb: ATAPI 48X CD-ROM drive, 120kB Cache
hda: hda1 hda2 hda3 < hda5 hda6 hda7 hda8 hda9 hda10 >
hdb: DMA interrupt recovery
hdb: lost interrupt
hdb: status timeout: status=0xd0 { Busy }
hdb: status timeout: error=0x00
hdb: DMA disabled
hdb: drive not ready for command
hdb: ATAPI reset complete

Klaus

e-mail : frahm@irsamc.ups-tlse.fr


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