Hi, I have a Dawicontrol 2975U SCSI Controller with three devices (CD-ROM, CD-Writer and Scanner) connected to it. Some time ago I encountered some problems. Everytime I insert the module for the controller I get the following in my syslog: Sep 2 18:14:06 kasunic kernel: ncr53c8xx: at PCI bus 0, device 15, function 0 Sep 2 18:14:06 kasunic kernel: ncr53c8xx: 53c875E detected Sep 2 18:14:06 kasunic kernel: ncr53c875E-0: rev=0x26, base=0xd9001000, io_port=0xd800, irq=11 Sep 2 18:14:06 kasunic kernel: ncr53c875E-0: ID 7, Fast-20, Parity Checking Sep 2 18:14:06 kasunic kernel: ncr53c875E-0: on-chip RAM at 0xd9000000 Sep 2 18:14:06 kasunic kernel: ncr53c875E-0: restart (scsi reset). Sep 2 18:14:06 kasunic kernel: ncr53c875E-0: Downloading SCSI SCRIPTS. Sep 2 18:14:06 kasunic kernel: scsi0 : ncr53c8xx - version 3.2a-2 Sep 2 18:14:06 kasunic kernel: scsi : 1 host. Sep 2 18:14:09 kasunic kernel: Vendor: TOSHIBA Model: CD-ROM XM-6401TA Rev: 1009 Sep 2 18:14:09 kasunic kernel: Type: CD-ROM ANSI SCSI revision: 02 Sep 2 18:14:09 kasunic kernel: Vendor: YAMAHA Model: CRW6416S Rev: 1.0d Sep 2 18:14:09 kasunic kernel: Type: CD-ROM ANSI SCSI revision: 02 I think that's OK. Now if I try to mount a cdrom the following happens (please note the 'Detected scsi CD-ROM sr0 and sr1' lines; AFAIK it should be scd0 and scd1?): Sep 2 18:16:11 kasunic kernel: Detected scsi CD-ROM sr0 at scsi0, channel 0, id 1, lun 0 Sep 2 18:16:11 kasunic kernel: Detected scsi CD-ROM sr1 at scsi0, channel 0, id 2, lun 0 Sep 2 18:16:11 kasunic kernel: ncr53c875E-0-<1,*>: FAST-20 SCSI 20.0 MB/s (50 ns, offset 16) Sep 2 18:16:41 kasunic kernel: scsi : aborting command due to timeout : pid 17, scsi0, channel 0, id 1, lun 0 0x1a 00 2a 00 80 00 Sep 2 18:16:41 kasunic kernel: ncr53c8xx_abort: pid=17 serial_number=31 serial_number_at_timeout=31 Sep 2 18:16:41 kasunic kernel: ncr53c875E-0: abort ccb=c3755020 (cancel) Sep 2 18:16:42 kasunic kernel: SCSI host 0 abort (pid 17) timed out - resetting Sep 2 18:16:42 kasunic kernel: SCSI bus is being reset for host 0 channel 0. Sep 2 18:16:42 kasunic kernel: ncr53c8xx_reset: pid=17 reset_flags=2 serial_number=31 serial_number_at_timeout=31 Sep 2 18:16:42 kasunic kernel: ncr53c875E-0: restart (scsi reset). Sep 2 18:16:42 kasunic kernel: ncr53c875E-0: Downloading SCSI SCRIPTS. Sep 2 18:16:42 kasunic kernel: ncr53c875E-0-<1,*>: FAST-20 SCSI 20.0 MB/s (50 ns, offset 16) Sep 2 18:17:14 kasunic kernel: SCSI host 0 abort (pid 17) timed out - resetting Sep 2 18:17:14 kasunic kernel: SCSI bus is being reset for host 0 channel 0. Sep 2 18:17:14 kasunic kernel: ncr53c8xx_reset: pid=17 reset_flags=2 serial_number=32 serial_number_at_timeout=32 Sep 2 18:17:14 kasunic kernel: ncr53c875E-0: restart (scsi reset). Sep 2 18:17:14 kasunic kernel: ncr53c875E-0: Downloading SCSI SCRIPTS. Sep 2 18:17:14 kasunic kernel: ncr53c875E-0-<1,*>: FAST-20 SCSI 20.0 MB/s (50 ns, offset 16) Sep 2 18:17:46 kasunic kernel: SCSI host 0 abort (pid 17) timed out - resetting Sep 2 18:17:46 kasunic kernel: SCSI bus is being reset for host 0 channel 0. Sep 2 18:17:46 kasunic kernel: ncr53c8xx_reset: pid=17 reset_flags=2 serial_number=33 serial_number_at_timeout=33 Sep 2 18:17:46 kasunic kernel: ncr53c875E-0: restart (scsi reset). That goes on forever. It's impossible to work with the system in that state and I have to reboot. I'm not able to use the devices connected to the controller. I've tried compiling new kernels (2.2.14, 2.2.16, 2.4.0-test7) with different SCSI lowlevel drivers (ncr53c8xx and sym53c8xx) to no avail. I searched the web but couldn't find anything helpful. Did anyone experience something similar? I really would appreciate any hint. TIA Robert PS: SCSI worked flawlessly for quite a long time with kernel 2.2.14. I did *not* change any options during the kernel configuration.
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