Re: [gentoo-user] Re: DMA for /dev/cdrom ?

[Raymond Lewis Rebbeck <dystopianray@gmail.com>]

On Monday, 10 July 2006 22:12, Andreas Burghardt wrote:
> On Mon, Jul 10, 2006 at 02:10:10PM +0200, Stef?n Istv?n wrote:
> > h?tf? 10 j?lius 2006 13.40 d?tummal Andreas Burghardt ezt ?rta:
> > > On Mon, Jul 10, 2006 at 12:26:08PM +0100, Mick wrote:
> > > > On Monday 10 July 2006 12:10, Andreas Burghardt wrote:
> > > > > *udma2
> > >
> > > I'm very sorry, but you all see that I'm quite new to Linux ...
> > > If UDMA2 is activated for the drive why is the data trasfer slow and
> > >
> > > tapa ~ # hdparm -d1 /dev/hdc
> > >
> > > /dev/hdc:
> > >  setting using_dma to 1 (on)
> > >  HDIO_SET_DMA failed: Operation not permitted
> > >  using_dma    =  0 (off)
> > >
> > > Why cant I activate DMA?
> >
> > What kind of chipset does your motherboard use?
> > You can check it with the lspci command. Maybe you have to load a kernel
> > module for that chipset...
>
> 00:00.0 Host bridge: Intel Corporation Mobile 915GM/PM/GMS/910GML Express
> Processor to DRAM Controller (rev 03)
> 00:01.0 PCI bridge: Intel Corporation Mobile 915GM/PM Express PCI Express
> Root Port (rev 03)
> 00:1d.0 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6
> Family) USB UHCI #1 (rev 04)
> 00:1d.1 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6
> Family) USB UHCI #2 (rev 04)
> 00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6
> Family) USB2 EHCI Controller (rev 04)
> 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev d4)
> 00:1e.2 Multimedia audio controller: Intel Corporation
> 82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97 Audio Controller (rev 04)
> 00:1e.3 Modem: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97
> Modem Controller (rev 04)
> 00:1f.0 ISA bridge: Intel Corporation 82801FBM (ICH6M) LPC Interface Bridge
> (rev 04)
> 00:1f.2 IDE interface: Intel Corporation 82801FBM (ICH6M) SATA Controller
> (rev 04)
> 01:00.0 VGA compatible controller: ATI Technologies Inc M22 [Radeon
> Mobility M300]
> 06:04.0 Network controller: Intel Corporation PRO/Wireless 2200BG Network
> Connection (rev 05)
> 06:06.0 CardBus bridge: ENE Technology Inc CB-710/2/4 Cardbus Controller
> 06:06.1 FLASH memory: ENE Technology Inc ENE PCI Memory Stick Card Reader
> Controller
> 06:06.2 Class 0805: ENE Technology Inc ENE PCI Secure Digital Card Reader
> Controller
> 06:07.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
> RTL-8139/8139C/8139C+ (rev 10)
> 06:0a.0 FireWire (IEEE 1394): Texas Instruments TSB43AB21 IEEE-1394a-2000
> Controller (PHY/Link)

Looks like the same chipset as my laptop. In order to get DMA working I had to 
set CONFIG_IDE=n and enable SCSI cdrom support and CONFIG_SCSI_ATA_PIIX.

Your cdrom device will become /dev/sr0 and you shouldn't have any issues with 
DMA.

>
> > Istvan
> >
> > --
> > gentoo-user@gentoo.org mailing list
>
> --
>
> "Dan ketika Guru Isa mendengar derap sepatu datang
>  ke pintu kamar mereka, dia merasa damai dengan rasa
>  takutnya yang timbul. Dia tahu teror mereka tidak
>  akan bisa menyentuhnya lagi. Dia telah bebas."
>  (Mochtar Lubis, "Jalan Tak Ada Ujung", 1952)

-- 
Raymond Lewis Rebbeck
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