[maemo-developers] [maemo-developers] external usb devices

[From: Juha Yrjölä]

On Wed, 2005-06-29 at 19:02 +0200, ext Nils Faerber wrote:

> Do I get this right that if one modifies an active (self powered) USB
> HUB so that the +5V VBUS is not connected to the 770 and a transgendered
> cable between the 770 and the USB HUB the 770 will then, host mode
> enabled, see the HUB and attached devices?

You have to modify an active USB hub so that a voltage of +5 V (from the
power supply, perhaps) is fed back to the VBUS line on the connector
going to the 770.  Otherwise the hub won't recognize the host (in this
case 770) being present.  On the 770 we don't have the capability of
driving the VBUS line.

After the modification, all the peripherals connected to the hub should
work just fine.  We've tried it out at least with USB mass storage
devices, input devices, Ethernet dongles and USB-to-RS-232 converters.

Cheers,
Juha