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
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