From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lukasz Majewski Date: Fri, 3 Feb 2017 14:07:44 +0100 Subject: [U-Boot] Dumb question: is UMS/MASS_STORAGE_GADGET in SPL possible? In-Reply-To: References: Message-ID: <20170203140744.2943bba4@jawa> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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-td262621.html#a262626 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 at 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 at denx.de