On Thu, 2004-01-22 at 17:46, Paul Varner wrote: > SuSE does it by having both the /dev/hdx and /dev/sr? devices in /dev > When you turned on DMA, it used the /dev/hdx device to turn on DMA. You > can do this in Gentoo manually, by creating the device manually and then > using hdparm with the created device. I haven't tested the interaction > with devfs, (i.e. does the created device stick around after a reboot) > but I did verify that it works.
Very cool Paul. Thanks. I played with this a bit. The created device does stick around after a reboot, but values get set back to default. Specifically, setting DMA to 0 and rebooting will yield DMA==1 when the box comes back up. I don't know the purpose of the keepsettings parameter. Maybe that would do something after a reboot. None the less, helpful. > What you need to do is execute one of the following commands based upon > which device is your SCSI emulated CD-ROM. (The device numbers can be > found /usr/src/linux/Documentation/devices.txt) > > /dev/hda: mknod /dev/hda b 3 0 > /dev/hdb: mknod /dev/hdb b 3 64 > /dev/hdc: mknod /dev/hdc b 22 0 > /dev/hdd: mknod /dev/hdd b 22 64 Values from /usr/src/linux/Documentation/devices.txt - OK If these ended up causing a problem one of these days, is there a command to remove the devices? rm /dev/hdd seems a bit draconian but maybe that's all that's required? > After that you should be able to use hdparm normally. Here is the > output from my system. (I have /dev/hdc, SCSI emulated) > > I got the same thing. Cool. > > Thanks much, Mark -- [EMAIL PROTECTED] mailing list
