[Gta04-owner] Connecting USB-Stick

[NeilBrown]

On Fri, 14 Sep 2012 12:44:30 +0200 Sven <openmoko at maricon.de> wrote:

> Hello,
> 
> meanwhile I also could get some cables that provide an 
> USB-host-connector on the OTG-port of the gta04 by connecting the ID pin 
> to ground. If I connect an USB stick during poweroff and start booting 
> then, after some time the stick's LED will light, indicating that it 
> will really get power. Within a terminal session of QtMoko v47 I can do 
> "ls /dev" and see at least that a /dev/usbdev2.2 has occured that will 
> not be there without the USB stick connected. QtMoko v48 even doesn't do 
> that. There nothing will happen at all.
> 
> When trying to mount /dev/usbdev2.2 under QtMoko v47, I always get the 
> error message "not a block device", although the stick contains a valid 
> FAT file system and mounting on another Linux system works without 
> problems. What's wrong here?
> 
> Besides: When QtMoko v47 suspends, it also will switch off the power of 
> the USB device. I think it shouldn't do that. And especially after 
> resuming, it should at least switch it on again, what currently it 
> doesn't do. More suspicious behaves QtMoko v48: It tries to suspend, the 
> USB stick's LED flickers one short time, and then QtMoko v48 resumes at 
> once again. It needs several attemps of this suspending/resuming, until 
> it really suspends. Of course then also without switching on USB's power 
> again after resume...
> 

I doubt that "/dev/usbdev2.2" is really the USB stick.  What does
  ls -l /dev/usbdev2.2
show?

The OTG port in the GTA04 will only provide 100mA.  All USB sticks I've
tried claim to require 200mA, so they don't get recognised at all.
Maybe if you used a power-hub....

NeilBrown
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