Hi, I'm not sure, whether you consider this is an issue. However, the device I have (Lego NXT in SAM-BA mode, lsusb shows it as 03eb:6124 Atmel Corp. at91sam SAMBA bootloader) is supported by both cdc_acm and sam_ba kernel modules, which leads to unpredictable behaviour. (Tested 2.6.38 - same issue in 2.6.37) If I plug the device in, the following happens if cdc_acm is already loaded: > usb 4-1: new full speed USB device using uhci_hcd and address 3 > cdc_acm 4-1:1.0: This device cannot do calls on its own. It is not a modem. > cdc_acm 4-1:1.0: ttyACM0: USB ACM device > usbcore: registered new interface driver cdc_acm > cdc_acm: v0.26:USB Abstract Control Model driver for USB modems and ISDN adapters > USB Serial support registered for sam-ba > usbcore: registered new interface driver sam-ba > sam_ba: v1.0: Atmel SAM Boot Assistant (SAM-BA) driver After unloading both cdc_acm and sam_ba, the following happends: > usb 4-1: new full speed USB device using uhci_hcd and address 4 > USB Serial support registered for sam-ba > sam-ba 4-1:1.1: sam-ba converter detected > usb 4-1: sam-ba converter now attached to ttyUSB0 > usbcore: registered new interface driver sam-ba > sam_ba: v1.0: Atmel SAM Boot Assistant (SAM-BA) driver > cdc_acm 4-1:1.0: This device cannot do calls on its own. It is not a modem. > cdc_acm: probe of 4-1:1.0 failed with error -16 > usbcore: registered new interface driver cdc_acm > cdc_acm: v0.26:USB Abstract Control Model driver for USB modems and ISDN adapters As you can see, the device is recognized by cdc_acm as well as sam_ba. Depending on which module is loaded, the device is either claimed by cdc_acm or sam_ba. The device name may be either ttyACM* or ttyUSB* I have no clue, whether there are Atmel SAM-BA implementations that do not support the cdc profile. I'm not sure, whether the device should be blacklisted in cdc_acm in favor of sam_ba. However, I have the feeling that if sam_ba is actually installed, sam_ba should claim the device even if cdc_acm is already loaded. Last time I tested, the device was working fine with cdc_acm, though. Kind Regards, Sven KÃhler -- 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
