Hi All,
Just like to provide feedback about getting the Comsol UHD-3542 USB
2.0 hard drive enclosure on 2.6 kernel. I am using FC6 with kernel
2.6.20-1.2933.fc6, and after setting the up enclosure, here's what I
initially got:
Apr 17 21:25:47 localhost kernel: usb 2-2: new high speed USB device
using ehci_hcd and address 4
Apr 17 21:25:58 localhost kernel: usb 2-2: device not accepting
address 4, error -110
Apr 17 21:25:59 localhost kernel: usb 2-2: new high speed USB device
using ehci_hcd and address 5
Apr 17 21:26:10 localhost kernel: usb 2-2: device not accepting
address 5, error -110
Apr 17 21:26:10 localhost kernel: usb 2-2: new high speed USB device
using ehci_hcd and address 6
Apr 17 21:26:21 localhost kernel: usb 2-2: device not accepting
address 6, error -110
Apr 17 21:26:21 localhost kernel: usb 2-2: new high speed USB device
using ehci_hcd and address 7
Apr 17 21:26:31 localhost kernel: usb 2-2: device not accepting
address 7, error -110
I tried plugging in to a different USB port, powering it on and off to no avail.
What worked was unloading the ehci_hcd kernel module, like so:
[EMAIL PROTECTED] jsalvo]# /sbin/rmmod ehci_hcd
... and then all of a sudden, it sees the hard drive. What confuses me
though is that once ehci_hcd was unloaded, it then uses a different
kernel module ... ohci_hcd to actually access the hard drive in the
hard drive enclosure, as shown below:
Apr 17 21:55:45 localhost kernel: usb 1-2: new full speed USB device
using ohci_hcd and address 7
Apr 17 21:55:47 localhost kernel: usb 1-2: configuration #1 chosen from 1 choice
Apr 17 21:55:47 localhost kernel: scsi4 : SCSI emulation for USB Mass
Storage devices
Apr 17 21:55:52 localhost kernel: scsi 4:0:0:0: Direct-Access
WDC WD800JB-00ET 77.0 PQ: 0 ANSI: 0 CCS
Apr 17 21:55:52 localhost kernel: SCSI device sdb: 156301488 512-byte
hdwr sectors (80026 MB)
Apr 17 21:55:52 localhost kernel: sdb: test WP failed, assume Write Enabled
Apr 17 21:55:52 localhost kernel: sdb: assuming drive cache: write through
Apr 17 21:55:52 localhost kernel: SCSI device sdb: 156301488 512-byte
hdwr sectors (80026 MB)
Apr 17 21:55:52 localhost kernel: sdb: test WP failed, assume Write Enabled
Apr 17 21:55:52 localhost kernel: sdb: assuming drive cache: write through
Apr 17 21:55:52 localhost kernel: sdb: sdb1 sdb2 sdb3 sdb4 < sdb5
sdb6 sdb7 sdb8 sdb9 sdb10 sdb11 >
Apr 17 21:55:52 localhost kernel: sd 4:0:0:0: Attached scsi disk sdb
Apr 17 21:55:52 localhost kernel: sd 4:0:0:0: Attached scsi generic sg1 type 0
Apr 17 21:55:58 localhost kernel: kjournald starting. Commit interval 5 seconds
Apr 17 21:55:58 localhost kernel: EXT3 FS on sdb7, internal journal
Apr 17 21:55:58 localhost kernel: EXT3-fs: mounted filesystem with
ordered data mode.
Apr 17 21:55:58 localhost hald: mounted /dev/sdb7 on behalf of uid 500
Question is:
1) Because I am using ochi_hcd and not ehci_hcd, does that mean I am
not really using USB 2.0 ??
2) Why did it try ehci_hcd in the first place and not ohci_hcd ?
Thanks,
John
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