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.
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 trini@ti.com Cc: Lukasz Majewski l.majewski@samsung.com Cc: Marek Vasut marex@denx.de Cc: Liu Bin b-liu@ti.com Cc: Lukas Stockmann lukas.stockmann@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(-)