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RioFL
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Joined: 31 Oct 2002
Posts: 407
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 Posted: Tue Mar 25, 2003 12:41 am Post subject: Kernel Confusion |
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Ok I am really confused here. I was running gentoo-sources 2.4.19-r10 just fine. I compiled 2.4.20-r2, made doubly sure all my scsi emulation stuff was right, everything works fine except my cdrw. No matter what I do, 2.4.20 and associated modules will not create /dev/sr0. Why? No changes were made at all to /etc/devfsd.conf, and as I said I took great pains to compare side by side the ide/scsi options to be sure I didn't miss or reconfigure somthing from what it was in 2.4.19. The modules load, sr_mod, sg, ide-scsi all just fine, and my new kernel definition in grub has the correct hdd=ide-scsi in it. yet there is no cdrw, no sg0, no sr0 absolutely nothing.
Chuck |
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Carlos
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Joined: 07 Aug 2002
Posts: 458
Location: Providence, RI
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| Posted: Tue Mar 25, 2003 2:08 am Post subject: |
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I'd search through the output of dmesg to look for anything related to your CD-RW so we can find out whether it's your kernel, or devfsd, or something else.
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RioFL
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Joined: 31 Oct 2002
Posts: 407
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| Posted: Tue Mar 25, 2003 2:30 am Post subject: |
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| Carlos wrote: | | I'd search through the output of dmesg to look for anything related to your CD-RW so we can find out whether it's your kernel, or devfsd, or something else. |
I can reboot back to 2.4.19 without touching a thing and magically the sr0 is there:). will look just to make sure. |
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RioFL
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Joined: 31 Oct 2002
Posts: 407
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| Posted: Tue Mar 25, 2003 2:37 am Post subject: |
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| Carlos wrote: | | I'd search through the output of dmesg to look for anything related to your CD-RW so we can find out whether it's your kernel, or devfsd, or something else. |
here is everything from dmesg related to devfs, cdrom, scsi
Starting kswapd
Journalled Block Device driver loaded
devfs: v1.12c (20020818) Richard Gooch (rgooch@atnf.csiro.au)
devfs: boot_options: 0x1
Installing knfsd (copyright (C) 1996 okir@monad.swb.de)
hdd: CD-W54E, ATAPI CD/DVD-ROM drive
hdd: ATAPI 32X CD-ROM CD-R/RW drive, 1280kB Cache, DMA
Uniform CD-ROM driver Revision: 3.12
Mounted devfs on /dev
scsi0 : SCSI host adapter emulation for IDE ATAPI devices
and thats it. |
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Fillzee
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Joined: 20 Jul 2002
Posts: 47
Location: Starkvegas
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| Posted: Tue Mar 25, 2003 2:52 am Post subject: |
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| If you still have the old .config file for your old kernel copy it to the new kernel source directory and do a make oldconfig. I have found this to be the best way to make shure to have all the kernel options properly selected. |
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RioFL
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Joined: 31 Oct 2002
Posts: 407
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| Posted: Tue Mar 25, 2003 3:02 am Post subject: |
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| Fillzee wrote: | | If you still have the old .config file for your old kernel copy it to the new kernel source directory and do a make oldconfig. I have found this to be the best way to make shure to have all the kernel options properly selected. |
the new kernel is ignoring the commandline parm hdd=ide-scsi
here is from the 2.4.19 dmesg:
Kernel command line: root=/dev/hda3 hdd=ide-scsi
ide_setup: hdd=ide-scsi
Local APIC disabled by BIOS -- reenabling.
now here is the same section from 2.4.20
Kernel command line: root=/dev/hda3 hdd=ide-scsi
Local APIC disabled by BIOS -- reenabling.
the ide_setup is missing from 2.4.20. i have gone over and over the options and those that are the same between the kernels are identical.
i remember seeing somewhere about someone sayiing the new kernels require an ignore statement in modules.conf. going to try to find that. |
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RioFL
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Joined: 31 Oct 2002
Posts: 407
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| Posted: Tue Mar 25, 2003 4:20 am Post subject: |
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I got it to work!
Since it did not appear to take the hdd=ide-scsi on the commandline, i remembered reading about an exclude that could be used. I found that again here:
https://forums.gentoo.org/viewtopic.php?t=20175&highlight=cdrw
in documentation tips n tricks. What i did was to create a file in the modules.d directory that contained this line:
options ide-cd ignore='hdd'
then ran update-modules to get this into modules.conf.
I also did something else that I don't believe had an effect. I think this line did it. I removed ide-atapi cdrom support from the kernel. I am going to put that back in tomorrow and try it to see if it matters.
As of this moment cdrw works just fine again.
Chuck |
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Regor
Guru
Joined: 06 Aug 2002
Posts: 545
Location: 39° 2' 48" N, 120° 59' 2" W
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| Posted: Tue Mar 25, 2003 8:29 am Post subject: |
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Removing ATAPI cdrom support makes system treat all cd drives as scsi. No kernel arguments are needed then either, since there's no potential for contention between diff drivers.
This is how I always do it and it always works perfectly.
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