Herb Peyerl wrote:
>actually, I was thinking about a USB keyboard but I'm betting the J720
>is a USB Device, not host. Or heck, a USB Mouse... but ah well. I know
>the intent is to be portable but sometimes you just want a real keyboard
>and mouse. 

The Jornada 720 has the SA1111 companion chip which contains an OHCI
USB host controller. I don't know whether it is brought out to an
external connector though as I don't own a J720.

There is a bug in the SA1111 that means that it can only do bus
master DMA into the first ~1M of RAM, depending on SDRAM type. There
isn't a PIO interface to the USB controller.

To get this to work we would need to add a bounce buffer implementation
and either move the kernel start address up, or create some hole fairly
near the start of it.

I have got a SA1111 OHCI attachment file which attaches the generic
ohci driver, but I haven't written the bounce buffer stuff.

Robert Swindells