Hello Lukasz,
In the dfu spez [1] chapter 4.2.1 the following fields are specified:
bDeviceClass = 00h (Description: „see interface“), currently set in U-Boot to 2.
bDeviceSubClass = 00h (Description: „see interface“), currently set in U-Boot to 2.
bcdUSB = xxxxh (Description: USB specification release number in binary coded decimal -> 0110h) Currently set to 0x200
If I look in ./drivers/usb/gadget/f_dfu.c:
static const struct usb_qualifier_descriptor dev_qualifier = { .bLength = sizeof dev_qualifier, .bDescriptorType = USB_DT_DEVICE_QUALIFIER, .bcdUSB = __constant_cpu_to_le16(0x0200), .bDeviceClass = USB_CLASS_VENDOR_SPEC, .bNumConfigurations = 1, };
bDeviceClass = USB_CLASS_VENDOR_SPEC = 0xff ?
Hmm... why states the doc this should be set to 0 = USB_CLASS_PER_INTERFACE? 2 is USB_CLASS_COMM ... which seems more appropriate ...
bDeviceSubClass is not defined ... bcdUSB = 0x0200 which should be 0x0110 ... oh, as [1] is the dfu 1.1 specification it should be 0x0110 but the spec [1] says 0100 ... is the spec here buggy? is there a dfu 2.0 specification availiable?
Has this differences to the spec some reason? Or can we change them to the values specified in the spec?
Thanks!
bye, Heiko
[1]: http://www.usb.org/developers/devclass_docs/DFU_1.1.pdf