我的光驱不能用了

popkev

内核为2.4.20
开机时出现以下消息:
hdc: Compaq DVD-ROM DVD-114 0114, ATAPI CD/DVD-ROM drive
hdd: CD-R/RW RW7083A, ATAPI CD/DVD-ROM drive
hdd: set_drive_speed_status: status=0x51 { DriveReady SeekComplete Error }
hdd: set_drive_speed_status: error=0x04
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
...
hdc: ATAPI DVD-ROM drive, 512kB Cache, UDMA(33)
Uniform CD-ROM driver Revision: 3.12
SCSI subsystem driver Revision: 1.00
scsi0 : SCSI host adapter emulation for IDE ATAPI devices
Vendor: Model: CD-R/RW RW7083A Rev: 1.20
Type: CD-ROM ANSI SCSI revision: 02
parport0: PC-style at 0x378 (0x77 [PCSPP,TRISTATE]
parport0: irq 7 detected
Attached scsi CD-ROM sr0 at scsi0, channel 0, id 0, lun 0
sr0: scsi3-mmc drive: 32x/32x writer cd/rw xa/form2 cdda tray
...
mount光盘的时候就是死机
请问应该如何调整,谢谢

Dragonfly

when u find this? after u install system? or after u did sth like recompiling the kernel, changing the grub.conf or lilo.conf, or changing the hdparm parameters...

popkev

just after installing the system
I had tried RH9 and ML1.1, the problem exists in both systems
I have searched google.com for an answer. It seems something related to the kernel. Unfortunately there arent any good resolutios except one that make a patch for kernel 2.5.xx, but I am not using such kernel.
I had tried hdparm: #hdparm -p4 /dev/hdd, but the cd-rw drive was still running in DMA mode.
have u ever seen such a problem before?thx

Dragonfly

i never, my cdrw always works fine for me. can u add ide-scsi or remove that from u lilo.conf or grub.conf and try?

popkev

i tried, but nothing happened
can i chang some options in my kernel's config file?
coz i am compiling my own 2.4.20 kernel these days.

popkev

and, i got an error while booting with my new compiled kernel:

Kernel panic: VFS: cannot mount root on 00:00 (something like that)

i followed the basic steps on Kernel How-to. bzImage and initrd and necessary modules had been made and installed in proper diretories. the correspondant part of my grub.conf is as follows:

title Test Kernel ..::Optimized for my P4::..
        root (hd0,0)
        kernel /bzImage.myP4.30may2003 ro vga=normal root=LABEL=/ hdd=ide-scsi
        initrd /initrd-2.4.20-myP4.30may2003.img

popkev

the vfs problem had been solved
and the cdrw problem still exists, ft!

Dragonfly

Could you activate the kernel config option "Enable DMA only for disks" and see if it still happens?

popkev

i have tried that option, nothing improved
will a newer version of kernel works?

Dragonfly

try to download a 2.5.6x one.

good luck.

popkev

i had fixed the problem now
it is the problem of dma compatiblity
after bootup, i used "hdparm -d0 /dev/hdd"
and it works!
but i had not tried burning any discs yet

Dragonfly

this is to disable the dma for u cdrom. then it is strange that why ""Enable DMA only for disks" option does not work.

try to burn some disc when u have time, and pls report u result here, thx.

popkev

ok, i will
and i am learning how to burn one under linux, bit of complex,

Dragonfly

u are improving uself and increase u knowledge. a great thing.

popkev

yes, the disc burning still works
it was really strange, my writer works well in multi-word dma mode under Win
does the kernel have a weak support of MW-DMA?