[U-Boot] usb flash boot on am335x machines

[matti kaasinen]

Hi!

I have tried to find solution to get am335x based Silica/Pengwyn board
booting from usb flash. U-boot on that board is based on u-boot 2013.10. I
flashed it with similar configuration as mmc flash, but I did not find
combination of configuration variables to get proper spl code generated. I
studied codes and it seemed like am33x devices were left out from usb spl
generation parts. Is there some kind of fundamental reason to prevent
am335x devices not to boot from usb flash. If not, would anyone know the
configuration combination for this set-up.

In fact, I found more than three years old patch that seems to make usb
boot set-up for am335x devices:
https://gitorious.org/rowboat/u-boot/commit/aaa9d5c083252218fd89afa68161f96bb7daa04c
However, it seems that these changed have somehow not been included in the
mainline codes. Is  there specific reason for this?

Best regards,
Matti Kaasinen