obcd wrote:Gordon has a model A, and another member on this forum removed the usb hub / lan switch from his model B board, which basically makes it a model A with a bunch of unused connectors.
We all agree the Pi misses usb packets (at least I hope so).
It could be the hub dropping them?
What should a hub do with an usb packet that isn't handled if another one arrives?
I have a very old creative webcam (from the time computers were like 200Mhz),
and the Pi can't produce a proper picture with it. (it's very low resolution)
It looks like the cpu speed is used as an excuse for what we are seeing.
I have seen no solid prove so far for it, and no response either upon the questions where I could follow what's being worked on.
If there are limits what can be used and what can't (at the moment), that's understandable.
The issue that's bugging me is the fact there is no clear line what is possible.
Even your own distributor Element 14 is selling usb hub's as recommended items for the Pi that don't work and backfeed power to the upstream usb port.
They are selling usb2ps2 adapters that lot of people are having trouble with...
o it's also understandable people become dissapointed about all this.
If the idea of releasing the Pi as a development board is to find and fix issues, than at least the foundation should play open card with it's (beta) testers.
Open Card - for goodness sake, HOW MUCH MORE OPEN CAN WE BE! The USB problem is acknowledged and being worked on. The Foundation has always said prior to the educational release that people are getting a development board.
As for limits, no-one knows what they are. Its impossible to test every USB device out there so how can the Foundation possible tell you what will and won't work? Also, if Farnell are selling equipment that doesn't work, then that is Farnell's issue - they are the ones selling them!
Just FYI, my hub works fine, all the USB devices I use work fine.
Principal Software Engineer at Raspberry Pi (Trading) Ltd.
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