Hi Jason

I'm trying to make a small image enabling u-boot UMS mode on BeagleBone Black against the on-board eMMC. Is it possible to enable UMS simply within SPL?

As fair as I remember UMS is not supported in SPL.

However, recently there was an attempt to use the DFU gadget in SPL (CONFIG_SPL_DFU_RAM):

http://u-boot.10912.n7.nabble.com/RFC-PATCH-v3-0-5-SPL-DFU-Support-in-SPL-td...

It is already supported in ML. You can look into this implementation and add similar code to support UMS.

It seems like some others have done it in the past ( http://lists.denx.de/pipermail/u-boot/2015-March/207600.html), but I don't see an obvious way to enable it.

In the link the UMS support is disabled to avoid too big size grown.

Performance might not be great ( https://boundarydevices.com/u-boot-usb-mass-storage-gadget/), but minimizing the user steps could make it worth doing it in u-boot (preferably SPL) than to load a kernel and ramdisk ( https://github.com/ungureanuvladvictor/BBBlfs).

Maybe you can reuse as much as possible from the SPL-DFU support?

---

U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot

Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de