I'm not sure if it is an hardware limitation since the sprue35.pdf
document(TMS320DM644x DMSoC Universal Serial Bus (USB)Controller User's
guide) says:

The USB has the following features:
ยท Supports 4 simultaneous RX and TX endpoints, more can be supported by
dynamically switching.


I tried with the 2.6.20-omap git kernel and I am able to configure my 2
usb ethernet but after that the networking drops dead. I'm not able to
ping anything. The 3 interfaces(eth0 onboard eth, eth1 usb-eth1, eth2
usb-eth2) are not usable but ifconfig shows eth0 eth1 eth2 up and
configured correctly.

Etienne


On Wed, 2007-03-21 at 12:12 -0700, Kevin Hilman wrote:
> On Mon, 2007-03-19 at 08:36 -0400, Etienne Gauthier wrote:
> 
> > I was wondering if anybody was able to plug 2 USB-Ethernet modules on
> > the Davinci? I'm using the Montavista 2.6.10-mvl401 kernel.
> 
> This is a known problem with the current USB driver, and is not unique
> to ethernet devices.  You'll have the same problem using a keyboard and
> mouse together.
> 
> IIUC, this is a hardware limitation which does not yet have a software
> workaround in the MUSB driver.   Patches welcome.  :)
> 
> Kevin
> 
> 
> 
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