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Subject: Re: usb-storage not recognizing archos 20g fm recorder in linux
From: John covici (covici_at_ccs.covici.com)
Date: 2003-10-27


Well, I found the answer -- the usb was disabled in the BIOS!! Once
that was fixed, I had something in the devices file and once that was
working, things went much better with the exception that the uhci
module must be built into the kernel (2.4.22), otherwise you get
unresolved external references having to do with the hot_plug_path .

on Monday 10/27/2003 Christian Mahr(christian.mahr.ulm_at_arcor.de) wrote
> Hi all,
>
> I have observed that hotplugging my archos recorder 20 to Linux depends
> sometimes on the sequence of what you do first:
>
> a) switch-on archos first, wait for complete power-up, then connect
> b) connect USB first, then power-on
>
> As I overserved, option a) works much more reliable than b).
>
> From my investigations (switching on tracing in usb-storage) in ealier kernel
> versions I believe that during b) the USB interface in the archos is not
> fully operable during boot, at a time linux already wants to access the disk.
> So sometimes the first accesses to the disk fail on a
> USB-block-exchange-level. On he other hand, until very recently, the re-tries
> from linux side following an USB failure did not work in all of the possible
> error scenarios. Such hang-ups can be be ovserved when you see usb-drivers in
> "D" or "DW" state....
>
> my current kernel version 2.4.23-pre7 seems to work best so far, but i did not
> do a exhaustive research on this very recent kernel version.
>
> Cheers
> Christian
>
>
> Am Freitag, 24. Oktober 2003 20:30 schrieb John covici:
> > Well I put the line in fstab and I got drivers and devices under
> > /proc/bus/usb, but under devices there is nothing, under drivers
> > there is usbdevfs usbhub and when I do the modprobe for usb-storage
> > there is usb-storage but the device is still not detected.
> >
> > on Friday 10/24/2003 Alexandre Belloni(abelloni_at_nerim.net) wrote
> >
> > > On Fri, Oct 24, 2003 at 10:39:59AM -0400, John covici wrote :
> > > > What do you mean "mounted your usbfs" -- this is part of the /proc
> > > > file system which of course is mounted.
> > >
> > > Do you have a line like that in your /etc/fstab ?
> > >
> > > none /proc/bus/usb usbfs defaults 0 0
> > >
> > > if not, usbfs is not mounted so there is nothing in /proc/bus/usb
> > >
> > > --
> > > Alexandre Belloni
> > > AE-UTBM: http://ae.utbm.fr - - Lolut: http://lolut.utbm.info
> > > Key fingerprint = A7C6 7CD4 4328 59D1 79FD B8BB 945F 4DD5 B634 89BD
>
> --
> Christian Mahr (privat) christian.mahr.ulm_at_arcor.de

-- 
         John Covici
         covici_at_ccs.covici.com



Page was last modified "Jan 10 2012" The Rockbox Crew
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