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Re: [PLUG] Problem with USB Flash Disk
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Well, if that is the case - I wonder if forcing my driver to ohci will
make the disk operate as usb 1.1 - then maybe it will be usable. I'd
sacrifice speed for being able to use it.
On Sun, 2004-01-18 at 19:22, sean finney wrote:
> heya,
>
> On Sun, Jan 18, 2004 at 06:05:20PM -0500, W. Chris Shank wrote:
> > I've highluighted the difference below. Basically, your system is
> > running USB 1.1 not USB 2.0 - which is why I was able to use it on an
> > older computer as well.
>
> yeah, i see that now. i saw
>
> > > D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
>
> and thought that was usb 2.0, not seeing the speed was set to
> 1.1 'full speed' @ 12mbps. turns out i'm using usb-uhci (as
> you could tell from my dmesg), but i guess i need to use the
> ehci driver for 2.0 support, assuming my hardware actually
> supports it (i'm researching this right now).
>
> > It may be due to the device identifiers not being in the hotplug
> > mappings as someone olse suggested - but I think it's odd that it would
> > work in USB 1.1 mode but not USB 2.0 mode - as the identifiers aren't
> > changing between modes (as far as I could tell).
>
> could be. i've also read that usb 2.0 support in 2.4 series kernel's
> isn't all that great. not only are there more bugs, but apparently
> you still can't get much faster than 10mbps bandwidth due to the
> i/o scheduling for usb devices in 2.4[1].
>
> On Sun, Jan 18, 2004 at 06:17:00PM -0500, W. Chris Shank wrote:
> > However, the lack of floppy could be causing the issue - if I boot with
> > the USB drive plugged in I get an error as if there is a floppy disk
> > with an unbootable disk inserted - I need to remove the USB drive and
> > retry.
>
> you mean your laptop can boot off of the usb drive? that's cool.
> bootstrap your favorite linux distro onto your usb drive and you
> have a nice rescue disk :)
>
> to try to see if it is a problem with the lack of a floppy drive, try
> modprobe'ing your floppy driver before putting the drive in, that might
> skip the floppy check. you could also try temporarily disabling your
> hotplug service and do everything manually to see if it's a problem
> with hotplug like you suspect.
>
> in the meantime, i'm going to try compiling myself a 2.6 kernel (and
> maybe a 2.4.24 kernel too) with the ehci support too see if i can
> get 2.0 support myself.
>
>
> sean
>
>
>
> [1] i found some good reading for this at
> http://www.linux-usb.org/usb2.html
--
W. Chris Shank
ACE Technology Group, LLC
http://www.acetechgroup.com
(610) 647-1055
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