Sorry for the delay responding to this thread. Whilst linux users'
computers are immune to viruses, our bodies are not. I spent Tuesday
evening through late Wednesday afternoon in bed with the flu, and I'm
still not 100%.
On Tue, Apr 18, 2006 at 10:51:44AM +0800, Fr?d?ric Grosshans wrote
> Le lundi 17 avril 2006 ? 18:51 +0100, Konstantin V. Gavrilenko a ?crit :
> >
> > So you have to do fdisk /dev/sdb, then quit, then the /dev/sdb1 is
> > magically available for mounting.
>
> I had this problem before, but it's not the case today :-(
> fdisk has no access to the /dev/sda device.
Frederic and Konstantin...
I have *EXACTLY* the same situation, and I figured out what was
causing it, and I came up with with a workaround; I wouldn't call it a
perfect solution.
- My old, emergency backup machine is a 1999 Dell PIII, 450 mhz, with
128 megs of RAM, and USB 1.1 hardware. According to dmesg, the
ehci_hcd code aborts at bootup, and only the ohci_hcd code runs.
All my USB1 and USB2 devices run OK. Mind you, at USB 1.1 speeds,
maybe I should say they *CRAWL* OK. The "auto" option for filesystem
type works OK in both the "mount" command and in /etc/fstab. I
could get away with an fstab entry like...
/dev/sdb1 /mnt/external auto noauto,user,noatime,notail 0 0
and simply "mount /mnt/external", regardless of what I hooked up to
the USB port.
- My relatively new AMD64 (in 32-bit mode) has USB2 hardware. I built
both ohci_ocd ehci_ocd into the kernel. I experienced the following
symptoms...
- USB1 devices were totally flakey, sometimes they would show up as
/dev/sdb1, and sometimes they wouldn't. When it didin't show up...
> > So you have to do fdisk /dev/sdb, then quit, then the /dev/sdb1 is
> > magically available for mounting.
would usually work, but not always.
- USB2 devices would show up OK, and run at USB2 speeds, but "auto"
would *NOT* work as a filesystem type with either /etc/fstab or the
"mount" command
After a lot of screwing around I came up with the following workaround.
- build ohci_hcd into the kernel
- build ehci_hcd as a module. Do *NOT* auto-load the ehci_hcd module.
- write local udev rules to generate symlinks for my USB devices.
/etc/fstab has entries that mount the symlinks, and those entries
specify the filesystem type. I use "msdos" for my camera's memory
cards, "vfat" for my mp3 player, and "reiserfs" for my backup drives.
Run in USB1.1 mode most of the time. When I'm backing up my hard
drive to a USB2 drive, and I want the extra speed, I run the commands
modprobe ehci_ocd
udevstart
...before I plug in the backup drive. When I'm finished, and have removed
the backup drive, I run the commands
rmmod ehci_ocd
udevstart
...and I'm back to where I was before. It's not perfect, but it works.
--
Walter Dnes <[EMAIL PROTECTED]> In linux /sbin/init is Job #1
My musings on technology and security at http://tech_sec.blog.ca
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