I've got a cdrw/dvd combo drive in my thinkpad, and i've just emerged vanilla-sources 
and applied ck2 patches.  the device seems to function properly as it did before.

brett@ThinkBox> file /dev/cdrw
/dev/cdrw: symbolic link to /dev/scsi/host0/bus0/target0/lun0/cd

brett@ThinkBox> cdrecord -scanbus
Linux sg driver version: 3.1.24
Using libscg version 'schily-0.7'
scsibus0:
        0,0,0     0) 'TEAC    ' 'DW-28E          ' '2.1A' Removable CD-ROM
        ...

brett@ThinkBox> grep SCSI /usr/src/linux/.config |grep -v \^\#\|not
CONFIG_BLK_DEV_IDESCSI=y
CONFIG_SCSI=y
CONFIG_SCSI_DEBUG_QUEUES=y
CONFIG_SCSI_MULTI_LUN=y
CONFIG_SCSI_CONSTANTS=y
CONFIG_SCSI_SYM53C8XX=y
CONFIG_SCSI_NCR53C8XX_DEFAULT_TAGS=4
CONFIG_SCSI_NCR53C8XX_MAX_TAGS=32
CONFIG_SCSI_NCR53C8XX_SYNC=20

brett@ThinkBox> grep kernel /boot/grub/grub.conf 
kernel /bzImage root=/dev/hda6 cpufreq=1200000:1600000:performance vga=791 
video=vesa:1024x768@70 hdc=ide-scsi

Notice i have the 'hdc=ide-scsi' option passed to the kernel because i am using the 
CONFIG_BLK_DEV_IDESCSI compile option.  Basically, i didn't notice a change when 
installing 2.4.20, and i'm using ck2 patches.

Make sure you have these things configurations as i do.  Best regards,

lion-O


On Tue, Feb 11, 2003 at 03:04:12PM -0800, Balaji Srinivasan wrote:
> I have the same problem.
> Is it a problem with 2.4.20 kernels? (I havent done any patches to it)
> Balaji

 
>> I have just patched and compiled succesfully the vanilla 2.4.20 with the ck3
 
>> patches. Desktop now runs a bit faster (specially kde apps). But i'm trying 
>> to get my CDRW unit (hdc) as an SCSI device, but with the parametres i had 
>> with 2.4.19, it doesn't works. I had all the kernels parametrers i thought 
>> were necesary (3 at all,SCSI support, SCSI emulation support,SCSI CDROM and 
>> something else). Also, i had the grub parameter for the kernel-line hdc=scsi
 
>> (ide-scsi did'nt work, unlike the gentoo-installation-guide said).
>> Now, hdc is a IDE device and exists, but with the old kernel and booting
>> grub 
>> as i'd explained, hdc dissappeared and /scsi/lun0/part0 or something like 
>> this appeared. 
>> I don't know what's happening. SCSI CDROM support is activated , but grub's 
>> kernel parameters (hdc=scsi or hdc=ide-scsi) doesn't work.
>> Any ideas?
>> thanks!!!

-- 
''Wisdom is the companion of patience''

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Brett Ryan Campbell
Systems Administrator, CAD Research Center
Cal Poly State University, San Luis Obispo, CA 93407
http://www.cadrc.calpoly.edu/frameset_content/content_about_us.html

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