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Date: Thu,  3 Aug 2000 10:12:58 -0700 (PDT)
From: boopboopboop@hotmail.com
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Subject: kern/20384: Phase errors with Zip650 CD on USB
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>Number:         20384
>Category:       kern
>Synopsis:       Phase errors with Zip650 CD on USB
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Aug 03 10:20:01 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Dan Conti
>Release:        4.1, 4.1RC, 4.0
>Organization:
>Environment:
FreeBSD  4.1-RC1 FreeBSD 4.1-RC1 #0: Fri Jul 14 22:27:29 GMT 2000    root@deimos.cdrom.com:/usr/src/sys/compile/GENERIC  i386
>Description:
With the 3 listed kernels and an Iomega ZipCD 650 USB drive, i get repeated Phase errors. I recompiled with all the debugging for umass and usb turned on, and tracked it to a bogus cmd being sent to the device. it was sending an inquiry (12h) with the correct allocation length (36 bytes) which was succeeding, then sending an inquiry with a bogus allocation length (55 bytes) which caused the phase error. I put a quick hack in umass.c to take all inquiry cmds to the device and remap the allocation length to 36 bytes, which seems to have fixed it. sorry i do not have the time to track down the real source and provide a patch.
>How-To-Repeat:
Purchase Zip650 CD drive.
Apply to USB port.
Configure kernel for umass support.
Achieve Nirvana.
>Fix:
I didn't take the time to track down the source of the bogus cmd, i just put a filter in the umass layer before the cmd was sent out so it would be structured properly. FYI the drive seems to behave properly now. I might have backlogs of the debug output, if that would be helpful mail me and i can search for them.

>Release-Note:
>Audit-Trail:
>Unformatted:


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