Re: kernel option for scsi emulation

[Hugo Vanwoerkom <hvw59601@care2.com>]

On 11/12/2010 02:10 PM, Hugo Vanwoerkom wrote:
> On 11/12/2010 01:49 PM, Camaleón wrote:
> > On Fri, 12 Nov 2010 12:06:16 -0600, Hugo Vanwoerkom wrote:
> >
> > > I have 2 kernels: Debian's 2.6.32-5-686 and my own 2.6.36-hvw.
> > >
> > > The former no longer has /dev/hd* the latter does as shown by blkid. [1]
> > > blkid for 2.6.32-5-686 and [2] for 2.6.36-hvw.
> > >
> > > What kernel option is responsible for that? Obviously I don't have that
> > > set in 2.6.36-hvw.
> >
> > (...)
> >
> > In brief, if I got it correctly, your Maxtor hard disk (IDE) is being
> > detected as "/dev/hd*" in 2.6.36 (using legacy pata module) and as "/dev/
> > sd*" in 2.6.32 (using new libata module).
> >
> > Back to days I was using openSUSE, pata modules were loaded by telling
> > the kernel "hwprobe=-modules.pata" at GRUB prompt (or by stating so in
> > menu.lst). Maybe you are inadvertenly loading legacy pata module or you
> > have compiled the kernel with that flag switched on :-?
> >
> > Compare both "lsmod | grep ata" outputs.
>
> Good suggestion:
>
> hugo@Debian:/$ grep ata 11.2.6.32-5-686.lsmod
> ata_generic 2047 0
> libata 115745 3 ata_generic,sata_via,pata_via
> pata_via 5701 4
> sata_via 5608 0
> scsi_mod 101401 6 ums_cypress,usb_storage,sg,sr_mod,sd_mod,libata
> hugo@Debian:/$ grep ata 11.2.6.36-hvw.lsmod
> ata_generic 2075 0
> libata 116648 2 ata_generic,sata_via
> sata_via 5380 0
> scsi_mod 100151 5 sg,sd_mod,ums_cypress,usb_storage,libata
>
>
> So both kernels have libata, but only 2.6.32-5-686 has pata_via and sr_mod.

lsmod | grep sr_mod
hugo@Debian:/usr/src/linux-2.6.36$ grep CONFIG_BLK_DEV_SR .config
CONFIG_BLK_DEV_SR=m

that is the SCSI CDrom module and that is set in the kernel.
Don't know why it does not show up in lsmod.

That leaves the pata_via module and that indeed is not set.

So the difference in getting /dev/hd* is solely due to the absence of 
the pata_via module?

Hugo