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SubjectRe: Udev coldplugging loads 8139too driver instead of 8139cp
Date
On Tuesday 29 January 2008 11:43:53 Michael Tokarev wrote:
> Stephen Hemminger wrote:
> > On Tue, 29 Jan 2008 03:46:08 +0300
> > Michael Tokarev <mjt@tls.msk.ru> wrote:
>
> []
>
> >> There are 2 drivers for 8139-based NICs. For really different two kinds
> >> of hardware, which both uses the same PCI identifiers. Both drivers
> >> "claims" to work with all NICs with those PCI ids, because "externally"
> >> (by means of udev for example) it's impossible to distinguish the two
> >> kinds of hardware, it becomes clean only when the driver (either of the
> >> two) loads and actually checks which hardware we have here.
> >
> > Is there any chance of using subdevice or subversion to tell them apart?
> > That worked for other vendors like DLINK who slapped same ID on different
> > cards.
>
> If it were that simple... ;)
>
> No. The difference is in PCI revision number (byte #8 in PCI config
> space). If it's >= 0x40 - it's 8139too, < 0x40 - 8139cp. Or 0x20 - I
> forgot.

Perhaps a module could be created that will claim this device ID and then use
the correct driver.

> Here's a code snippet from a shell script I used ages ago to automatically
> load modules (similar to what udev does nowadays):
>
> # special hack for 8139{too,cp} stuff
> case "$modalias" in
> *v000010ECd00008139*)
> rev="$(dd if="$1/config" bs=1 skip=8 count=1 2>/dev/null)"
> if [ -n "$rev" ]; then
> list=
> for module in $modlist; do
> case "$module" in
> 8139cp)
> if [ ".$rev" \< ". " ]; then
> $vecho1 "$TAG: not loading $module for this device"
> continue
> fi
> ;;
> 8139too)
> if [ ".$rev" \> ". " ]; then
> $vecho1 "$TAG: not loading $module for this device"
> continue
> fi
> ;;
> esac
> list="$list $module"
> done
> modlist="$list"
> fi
> ;;
> esac
>
> /mjt
> --
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--
Ondrej Zary


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