[maemo-developers] USB 2.0 Re: [maemo-developers] speeding up MMC (with success)

[From: Koen Kooi]

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Frantisek Dufka schreef:
> Koen Kooi wrote:
>> Frantisek Dufka schreef:
>> >Yet when usb cable is
>>> inserted kernel says something about full speed config. Unfortunately
>>> full speed is 12Mbps USB 1.1 speed. USB 2.0 is called high speed.
>>
>> usb 2.0 high speed = 12Mbps
>> usb 2.0 full speed = 480MBps
>>
>> welcome to usb marketing speak :(
> 
> Are you sure? I haven't come across this meaning yet.
> 
> http://www.everythingusb.com/usb2/faq.htm
> http://www.linux-usb.org/usb2.html
> 
> But anyway in kernel full speed realy means 12Mbps. Looks like
> g_file_storage can handle USB 2.0 (CONFIG_USB_GADGET_DUALSPEED) but it
> is not enabled.
> 
> It looks like the host mode is only 1.1 (there is only ohci-omap, not
> ehci) but can at least the client/OTG mode do USB 2.0? Or is 'USB 2.0
> device mode for PC connectivity' here http://europe.nokia.com/A4145105 a
> mistake?

You can retroactively label usb 1.1 devices '2.0' and the pxa270 can only do 12Mbit
regardless of what intel's marketing department labels it.

regards,

Koen
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