Hi Bin, > Lukasz, > > On 09/09/2014 08:43 AM, Lukasz Majewski wrote: > > 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? > > > > The drivers must support full-speed anyway based on the USB2.0 Specs. > > I have seen many cases in which only full-speed is suitable due to > either board design or specific USB use case. > > One example is that to better fit to the production firmware flashing > automation, a board does not use standard USB receptacle or plug, but > a four touch pads on the PCB, so that the robot can grab the board > and touch the pads to download the firmware. In this case signal > integrity is a concern, but not download speed.
Thanks for example. Best regards, Lukasz > > Regards, > -Bin. > > >> 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? > > > > Thanks in advance. > > > >> > >> Cc: Tom Rini <tr...@ti.com> > >> Cc: Lukasz Majewski <l.majew...@samsung.com> > >> Cc: Marek Vasut <ma...@denx.de> > >> Cc: Liu Bin <b-...@ti.com> > >> Cc: Lukas Stockmann <lukas.stockm...@siemens.com> > >> > >> Heiko Schocher (2): > >> usb: dfu: add config option to use in dfu mode fullspeed only > >> arm: am335x: siemens board use in DFU mode fullspeed only > >> > >> README | 3 +++ > >> drivers/usb/gadget/f_dfu.c | 3 +++ > >> drivers/usb/gadget/g_dnl.c | 3 +++ > >> include/configs/siemens-am33x-common.h | 3 ++- > >> 4 files changed, 11 insertions(+), 1 deletion(-) > >> > > > > > > > -- Best regards, Lukasz Majewski Samsung R&D Institute Poland (SRPOL) | Linux Platform Group _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
