Re: Fwd: Re: portable usb drive problem

On Fri, 6 Jul 2007, Gene Heskett wrote:

> >> And down in the lower portion of that list is:
> >> scsi_mod              137549  5 usb_storage, sr_mod, sg, libata, sd_mod
> >>
> >> So there's a bunch of stuff on the FC5 box that's missing on the FC6 box.
> >> Starting with libata and sr_mod.  Go look at my .config again I guess.
> >
> >Libata is important for SATA.  It may be built into your FC6 kernel
> >instead being a separate module.  sr_mod is the SCSI CD/DVD driver; you
> >don't need it if you're not using a CD or DVD drive.
> 
> I'm running 2 6 22-rc7-cfs-v18 on the FC6 box.  And I cannot find any 
> references to a libata in a make xconfig.
> 
> Also, if I 'locate libata' and filter to this kernel:
> 
> /usr/src/linux-2.6.22-rc7-cfs-v18/Documentation/DocBook/libata.tmpl
> /usr/src/linux-2.6.22-rc7-cfs-v18/drivers/ata/libata-acpi.c
> /usr/src/linux-2.6.22-rc7-cfs-v18/drivers/ata/libata-core.c
> /usr/src/linux-2.6.22-rc7-cfs-v18/drivers/ata/libata-eh.c
> /usr/src/linux-2.6.22-rc7-cfs-v18/drivers/ata/libata-scsi.c
> /usr/src/linux-2.6.22-rc7-cfs-v18/drivers/ata/libata-sff.c
> /usr/src/linux-2.6.22-rc7-cfs-v18/drivers/ata/libata.h
> /usr/src/linux-2.6.22-rc7-cfs-v18/include/asm-generic/libata-portmap.h
> /usr/src/linux-2.6.22-rc7-cfs-v18/include/asm-ia64/libata-portmap.h
> /usr/src/linux-2.6.22-rc7-cfs-v18/include/asm-powerpc/libata-portmap.h
> /usr/src/linux-2.6.22-rc7-cfs-v18/include/linux/libata.h
> 
> That doesn't look as if its being built.  It is present in the lib/modules 
> path for the distribution kernels though:
> 
> /lib/modules/2.6.20-1.2948.fc6/kernel/drivers/ata/libata.ko
> /lib/modules/2.6.20-1.2952.fc6/kernel/drivers/ata/libata.ko
> /lib/modules/2.6.20-1.2962.fc6/kernel/drivers/ata/libata.ko

All right, so the libata module is in some of your kernels and not 
others.  I doubt that it has anything to do with your USB hard drive 
not working.  usb-storage does not interact with libata.

> However when booted to 2.6.20-1.2962, that part still doesn't work.
> 
> If this device is plugged into the lappy at powerup time the bios scan finds 
> it and the post continues unaffected.
> 
> If this device is plugged into ANY usb port, root or hub, this box won't even 
> post till it is unplugged, at which point the post continues normally.
> 
> That points to a bios difference also.  Unforch, biostars web pages are under 
> reconstruction so I can't check for bios updates there.  I've emailed the 
> webmaster, but no reply as yet.

Actually it points to a hardware problem, such as insufficient power.  
The BIOS symptoms suggest that the BIOS driver is unable to deal with 
the malfunctioning drive just as the Linux driver is.

Alan Stern


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