In message B93B9645-220E-11D9-BC4B-000A959A0A94@loser.net you wrote:
We are using u-boot on a Samsung S3C2410 based board and have USB mostly working using the arm920t USB driver. I say mostly working as some mass storage devices work fine, but most do not.
This is normal. Use the working tdevices, and throw away the rest.
I'm curious if these are known problems or likely to be something in the way we have (or have not) set up usb? Might anyone have some recommendations as to where to start looking?
There are many, many USB devices out there which are out of spec, or where controller/firmware problems get fixed in the windows drivers provided by the vendor (either directly or through M$). Typically such devices will not work under Linux, or only with special quirks. U-Boot does not implement any such quirks, which makes it a bit picky.
Using USB 2.0 spec'ed devices usually increases the chance that they will work with U-Boot.
Best regards,
Wolfgang Denk