On Thu, Nov 12, 2015 at 02:55:04PM +0100, Bjørn Mork wrote: > Daniele Palmas <dnlplm@xxxxxxxxx> writes: > > But I see that Infineon flashing devices in newer chipsets have become > > an only bulk serial link device (see device 0x8087/0x0716 in > > usb-serial-simple), so maybe this has a meaning... > > Yes. I have a Sierra Wireless EM7345 modem which is based on the same > chipset. I haven't really paid much attemtion to the flashloader > functionality before, but this is how that modem looks before it loads > its Sierra firmware: > So this device looks very much like an ACM device, except that it is > missing the necessary control interface and status endpoint. And > without a control interface there is of course no way to send a properly > formatted CDC control request either. > > I assume the different vendors also use the same Intel provided firmware > toolkit, making the firmwares share basic functionality like bootloader > and flashing. But the USB descriptors are likely configurable by the > vendor. Telit might have tried to "improve" the above into a proper ACM > device. > > I believe this supports the assumption that Infineon Flash Loader > devices have some ACM descriptors without actually being ACM class > devices, and that it is best to just collect them all in the > usb-serial-simple "flashloader" driver. I'm still not convinced. The device at hand does look and apparently behaves like a compliant ACM device, and I think we need to figure out why it does not work with this particular proprietary user-space tool before modifying the kernel. For example, using usb-serial-simple means that no line-control requests are sent. Perhaps the tool simply needs to set the termios settings to something else than the default 9600N81 that the cdc-acm driver uses. Modem control-requests would not be sent either (and HUPCL determines if DTR/RTS is lowered at close). Daniele, could you provide some more details about what happens when the proprietary tool fails. Do you have access to the sources? Johan -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
