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From: Xian <ian@codepad.net>
To: freebsd-questions@freebsd.org
Date: Sat, 15 Jan 2005 11:59:43 +0000
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Subject: Re: kernel panic on umass drive
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On Saturday 15 January 2005 11:52, Xian wrote:
> I have small USB flash drive that has worked quite well up until now with
> FreeBSD. I've found I have to boot with it plugged in as when I don't will
> give a line in dmesg:
>
> umass0: Generic USB Flash Disk, rev 1.10/1.00, addr 5
>
> but it only give the lines
Sorry, I meant it only gives the following when it is plugged in on boot
>
> umass0: Generic USB Flash Disk, rev 1.10/1.00, addr 5
> da0 at umass-sim0 bus 0 target 0 lun 0
> da0: <Generic USB Flash Disk 1.00> Removable Direct Access SCSI-0 device
> da0: 1.000MB/s transfers
> da0: 31MB (63904 512 byte sectors: 64H 32S/T 31C)
>
> I found that when I didn't have the da0 lines (It wasn't in the machine on
> boot) and I pulled the drive out it the kernel panicked about a page fault.
> The instruction pointer was 0xc0489e5b, and current process was 31 (irq21:
> uhci0 uhci1*).
>
> [ian@hercules:~] %nm -n /boot/kernel/kernel | grep c0489e5
> c0489e50 t uhci_check_intr
> [ian@hercules:~] %uname -a
> FreeBSD hercules.codepad.net 5.3-RELEASE-p4 FreeBSD 5.3-RELEASE-p4 #6: Fri
> Jan 14 23:59:29 GMT 2005
> root@hercules.codepad.net:/usr/obj/usr/src/sys/HERCULES i386
>
> Also a yesterday I compiled in "device ehci" and the kernel panicked on
> boot when just after it had detected umass when the drive was plugged in.
> So I compiled it out again.
>
> I have had other USB Flash drives work properly on earlier version(s) of
> either 5.2.1R or 5.3R, I can't remember.
>
> I'm not sure how to get round this, or who this information would help. Any
> help will be very much appreciated, or who to send this info to.



-- 
/Xian

"INDECISION is the key to FLEXIBILITY"
unknown author