USB, select/poll for ucom

[Danny Braniss]

[...]
> have fun.  the mindshare book is good.  however, it took me a long
> time to get a usb 'aha' moment and understand its twisty maze was
> really a workable design obscured by standardese...  I suspect it is a
> problem in the usb chipset driver for the com part.  ttypoll just says
> 'you have data in the buffer' so for some reason the data isn't making
> into the tty buffer.
> 
> Warner

Im amazed at how some of you can write a driver based on the Spec. Docs!

here is a pearl i came across reading the USB spec for 1.1, page 43

      'The maximum allowable interrupt data payload
       size is 64 bytes or less for full-speed.'

danny