scsi emulation for CD burner

From: marcos (marcosbezerra_at_altern.org)
Date: 11/20/03

  • Next message: Albert Dengg: "Re: Help! strange bttv problem" 
    To: debian-user@lists.debian.org
Date: Thu, 20 Nov 2003 16:31:46 +0100

    Hello

    I'm having big troubles when I try to use my ide CD burner with scsi
    emulation.

    (Question #1 : is it true we have to use scsi emulation in order to burn
    CDs with a IDE cd burner ?)

    The problems begin when the system tries to load the ide-scsi module
    (when I manually load it with modprobe, when I run cdrecord -scanbus,
    when I try to mount a CD, etc...). As soon as the module is needed, the
    system enters an infinite loop :

    syslog shows me this:

    kernel: scsi : aborting command due to timeout : pid 0, scssi0, channel
    0, id 0, lun 0 Inquiry 00 00 00 ff 00
    hdc: lost interrupt
    kernel: ide-scsi: The scsi wants to send us more data than expected -
    discarding data
    kernel: ide-scsi: [[ 12 0 0 0 ff 0 0 0 0 0 0 0 ]
    kernel: ]
    kernel: ide-scsi: expected 256 got 352 limit 256
    kernel: hdc: lost interrupt
    kernel: ide-scsi: The scsi wants to send us more data than expected -
    discarding data
    kernel: ide-scsi: [[ 12 0 0 0 ff 0 0 0 0 0 0 0 ]
    kernel: ]
    [... endless loop]

    Here is my configuration:

    I have 2 hard drives (hda, hdb) on bus ide0
    I have 1 Samsung SW-240B CD burner (hdc) on bus ide1

    I use Debian Sid, kernel 2.4.22 with this compilation options :

    loopback device support : M
    scsi support (scsi_mod) : M
    scsi cdrom support (sr_mod) : M
    scsi generic support (sg) : M
    scsi emulation support (ide-scsi) : M
    include atapi-cdrom (ide-cd) : M
    iso9660 cdrom FS : M
    microsoft joliet cdrom : Y

    I have these lines in modules.conf:

    alias scd0 sr_mod #load sr_mod upon access of scd0
    alias scd1 sr_mod
    alias scd2 sr_mod
    alias scd3 sr_mod
    pre-install sg modprobe ide-scsi #load ide-scsi before sg
    pre-install sr_mod modprobe ide-scsi #load ide-scsi before sr_mod
    pre-install ide-scsi modprobe ide-cd #load ide-cd before ide-scsi

    I've added append "hdc=ide-scsi" in lilo.conf:

    image=/vmlinuz
            label=Linux
            append="hdc=ide-scsi acpi=off"
            read-only
    # restricted
    # alias=1

    Question #2 : I've read contradictory things about "hdc=ide-scsi". Some
    people say that this line is useless when compiling ide-scsi as a
    module. Some people says you HAVE TO put it there anyway. And some
    people say that the correct syntax for the latest kernels is
    "hdX=scsi" instead of "hdX=ide-scsi".
    I don't know who/what to believe.

    Now, let's take an example of what happens in my system:

    When I boot my linux, syslog shows me this :

    [...]
    kernel: ide_setup: hdc=ide-scsi
    [...]
    kernel: Uniform Multi-Platform E-IDE driver Revision: 7.00b eta4-2.4
    kernel: ide: Assuming 33MHz system bus speed for PIO modes; override
    with idebus=xx
    kernel: ICH2: IDE controller at PCI slot 00:1f.1
    kernel: ICH2: chipset revision 18
    kernel: ICH2: not 100%% native mode: will probe irqs later
    kernel: ide0: BM-DMA at 0xa800-0xa807, BIOS settings: h da:DMA, hdb:DMA
    kernel: ide1: BM-DMA at 0xa808-0xa80f, BIOS settings: h dc:DMA, hdd:pio
    kernel: hda: WDC WD400BB-75AUA1, ATA DISK drive
    kernel: hdb: WDC WD1200BB-00CAA1, ATA DISK drive
    kernel: blk: queue c02b8840, I/O limit 4095Mb (mask 0xfffff fff)
    kernel: blk: queue c02b897c, I/O limit 4095Mb (mask 0xfffff fff)
    kernel: hdc: SAMSUNG CD-R/RW SW-240B, ATAPI CD/DVD-ROM driv e
    kernel: ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
    kernel: ide1 at 0x170-0x177,0x376 on irq 15
    kernel: hda: attached ide-disk driver.
    kernel: hda: host protected area => 1
    kernel: hda: 78165360 sectors (40021 MB) w/2048KiB Cache, C
    HS=4865/255/63, UDMA(100)
    kernel: hdb: attached ide-disk driver.
    kernel: hdb: host protected area => 1
    kernel: hdb: 234441648 sectors (120034 MB) w/2048KiB Cache,
    CHS=14593/255/63, UDMA(100)
    kernel: Partition check:
    kernel: hda: hda1 hda2 hda3
    kernel: hdb: hdb1 hdb2
    [...]

    There is no indication about scsi emulation (excepted the first line).

    Question #3 : is it normal ?

    Then, I put an audio CD in my drive I try to mount the filesystem :

    mount -t iso9660 /dev/scd0 /cdburner

    And there the system HANGS !

    I open a new console and read syslog again to see what is going on:

    kernel: SCSI subsystem driver Revision: 1.00
    kernel: hdc: attached ide-scsi driver.
    kernel: scsi0 : SCSI host adapter emulation for IDE ATAPI ddevices
    kernel: scsi : aborting command due to timeout : pid 0, scssi0, channel
    0, id 0, lun 0 Inquiry 00 00 00 ff 00
    hdc: lost interrupt
    kernel: ide-scsi: The scsi wants to send us more data than expected -
    discarding data
    kernel: ide-scsi: [[ 12 0 0 0 ff 0 0 0 0 0 0 0 ]
    kernel: ]
    kernel: ide-scsi: expected 256 got 352 limit 256
    kernel: hdc: lost interrupt
    kernel: ide-scsi: The scsi wants to send us more data than expected -
    discarding data
    kernel: ide-scsi: [[ 12 0 0 0 ff 0 0 0 0 0 0 0 ]
    kernel: ]
    kernel: ide-scsi: expected 256 got 352 limit 256
    kernel: hdc: lost interrupt
    kernel: ide-scsi: The scsi wants to send us more data than expected -
    discarding data
    kernel: ide-scsi: [[ 12 0 0 0 ff 0 0 0 0 0 0 0 ]
    [... endless loop]

    Question #4 : how can I exit this loop without having to reboot (I'm
    getting tired of it?)

    Then, I have a look at the loaded modules:

    # lsmod
    Module Size Used by Not tainted
    ide-scsi 10320 2 (initializing)
    ide-cd 32352 0
    scsi_mod 85504 1 (autoclean) [ide-scsi]
    cdrom 28512 0 (autoclean) [ide-cd]
    [...]

    They have all been loaded after the mount command.
    ide-scsi remains in the "initializing" state, so I can't do anything...

    Just by curiosity:

    # cat /proc/scsi/scsi
    Attached devices:
    Host: scsi0 Channel: 00 Id: 00 Lun: 00
       Vendor: Model: Rev:
       Type: <NULL> ANSI SCSI revision: ffffffff

    Now, I don't know where to search anymore, I've spent hours looking at
    posts and searching in google, I've tried lots of diferent things
    (recompiling the kernel with differnt options, etc...).

    I need help !

    Thanks to all of you who can help me.

    Marcos

    PS one more thing : my cd burner does work (I've just tested it under
    windows to check... and it works !) 

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