From mboxrd@z Thu Jan 1 00:00:00 1970 From: Heiko Schocher Date: Tue, 09 Sep 2014 16:22:24 +0200 Subject: [U-Boot] [PATCH v1 0/2] usb: dfu: am335x: allow dfu in fullspeed mode only In-Reply-To: <20140909154309.6609949a@amdc2363> References: <1410266224-4051-1-git-send-email-hs@denx.de> <20140909154309.6609949a@amdc2363> Message-ID: <540F0D20.6050504@denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hello Lukasz, Am 09.09.2014 15:43, schrieb Lukasz Majewski: > Hi Heiko, > >> This patchserie adds the new config option CONFIG_DFU_FULLSPEED. > > Is there any special reason to support Full Speed (12 Mbit/sec - USB > 1.1) and not rely solely on the High Speed (USB 2.0) as we do now? > >> If this is enabled DFU uses fullspeed only. This is used on the >> siemens boards. > > Is there any DFU problem with the mentioned Siemens board, that we must > use USB 1.1? > > I'd also appreciate more verbose rationale for this patch series - why > this change is needed? What is the expected improvement? They have a "USB HW protection circuit" and therefore they only allowed to use fullspeed ... @Lukas Stockman: Maybe you could answer this better than me? bye, Heiko -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany