Just as an update, unloading the g_ether and loading g_serial results in a
working serial port at /dev/ttyGS0. Of course, the usb ethernet doesn't
work after this, and the modules can't be loaded at the same time.
# modprobe g_serial
modprobe: ERROR: could not insert 'g_serial': No such device
# rmmod g_ether
# modprobe g_serial
# systemctl start serial-getty@ttyGS0.service
resulting host lsusb:
Bus 003 Device 033: ID 0525:a4a7 Netchip Technology, Inc. Linux-USB Serial
Gadget (CDC ACM mode)
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 2 Communications
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0525 Netchip Technology, Inc.
idProduct 0xa4a7 Linux-USB Serial Gadget (CDC ACM mode)
bcdDevice 4.04
iManufacturer 1 Linux 4.4.39-ti-r75 with musb-hdrc
iProduct 2 Gadget Serial v2.4
iSerial 0
bNumConfigurations 1
OTG Descriptor:
bLength 3
bDescriptorType 9
bmAttributes 0x03
SRP (Session Request Protocol)
HNP (Host Negotiation Protocol)
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 78
bNumInterfaces 2
bConfigurationValue 2
iConfiguration 4 CDC ACM config
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 500mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 2
bFunctionClass 2 Communications
bFunctionSubClass 2 Abstract (modem)
bFunctionProtocol 1 AT-commands (v.25ter)
iFunction 7 CDC Serial
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 Communications
bInterfaceSubClass 2 Abstract (modem)
bInterfaceProtocol 1 AT-commands (v.25ter)
iInterface 5 CDC Abstract Control Model (ACM)
CDC Header:
bcdCDC 1.10
CDC Call Management:
bmCapabilities 0x00
bDataInterface 1
CDC ACM:
bmCapabilities 0x02
line coding and serial state
CDC Union:
bMasterInterface 0
bSlaveInterface 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x000a 1x 10 bytes
bInterval 9
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 6 CDC ACM Data
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 2 Communications
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
Thanks,
Jeremy
On Thursday, 22 December 2016 23:05:49 UTC+10, Jeremy Herbert wrote:
>
> Hi,
>
> I've just installed this image (
> https://rcn-ee.com/rootfs/bb.org/testing/2016-12-18/console/BBB-blank-debian-8.6-console-armhf-2016-12-18-2gb.img.xz
>
> ) on a BBB rev C, and a BBB with the 2GB flash. Both are behaving the same.
> They show up as an ethernet device, but not as a serial port. lsusb on the
> host confirms that they are not behaving as a serial port:
>
> Bus 003 Device 030: ID 0525:a4a2 Netchip Technology, Inc. Linux-USB
> Ethernet/RNDIS Gadget
> Device Descriptor:
> bLength 18
> bDescriptorType 1
> bcdUSB 2.00
> bDeviceClass 2 Communications
> bDeviceSubClass 0
> bDeviceProtocol 0
> bMaxPacketSize0 64
> idVendor 0x0525 Netchip Technology, Inc.
> idProduct 0xa4a2 Linux-USB Ethernet/RNDIS Gadget
> bcdDevice 4.04
> iManufacturer 1 BeagleBoard.org
> iProduct 2 BeagleBoneBlack
> iSerial 3 2513BBBK4941
> bNumConfigurations 2
> OTG Descriptor:
> bLength 3
> bDescriptorType 9
> bmAttributes 0x03
> SRP (Session Request Protocol)
> HNP (Host Negotiation Protocol)
> Configuration Descriptor:
> bLength 9
> bDescriptorType 2
> wTotalLength 78
> bNumInterfaces 2
> bConfigurationValue 2
> iConfiguration 0
> bmAttributes 0xe0
> Self Powered
> Remote Wakeup
> MaxPower 500mA
> Interface Association:
> bLength 8
> bDescriptorType 11
> bFirstInterface 0
> bInterfaceCount 2
> bFunctionClass 2 Communications
> bFunctionSubClass 6 Ethernet Networking
> bFunctionProtocol 0
> iFunction 6 RNDIS
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 0
> bAlternateSetting 0
> bNumEndpoints 1
> bInterfaceClass 2 Communications
> bInterfaceSubClass 2 Abstract (modem)
> bInterfaceProtocol 255 Vendor Specific (MSFT RNDIS?)
> iInterface 4 RNDIS Communications Control
> CDC Header:
> bcdCDC 1.10
> CDC Call Management:
> bmCapabilities 0x00
> bDataInterface 1
> CDC ACM:
> bmCapabilities 0x00
> CDC Union:
> bMasterInterface 0
> bSlaveInterface 1
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x82 EP 2 IN
> bmAttributes 3
> Transfer Type Interrupt
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0008 1x 8 bytes
> bInterval 9
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 1
> bAlternateSetting 0
> bNumEndpoints 2
> bInterfaceClass 10 CDC Data
> bInterfaceSubClass 0 Unused
> bInterfaceProtocol 0
> iInterface 5 RNDIS Ethernet Data
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x81 EP 1 IN
> bmAttributes 2
> Transfer Type Bulk
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0200 1x 512 bytes
> bInterval 0
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x01 EP 1 OUT
> bmAttributes 2
> Transfer Type Bulk
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0200 1x 512 bytes
> bInterval 0
> Configuration Descriptor:
> bLength 9
> bDescriptorType 2
> wTotalLength 91
> bNumInterfaces 2
> bConfigurationValue 1
> iConfiguration 0
> bmAttributes 0xe0
> Self Powered
> Remote Wakeup
> MaxPower 500mA
> Interface Association:
> bLength 8
> bDescriptorType 11
> bFirstInterface 0
> bInterfaceCount 2
> bFunctionClass 2 Communications
> bFunctionSubClass 6 Ethernet Networking
> bFunctionProtocol 0
> iFunction 11 CDC ECM
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 0
> bAlternateSetting 0
> bNumEndpoints 1
> bInterfaceClass 2 Communications
> bInterfaceSubClass 6 Ethernet Networking
> bInterfaceProtocol 0
> iInterface 8 CDC Ethernet Control Model (ECM)
> CDC Header:
> bcdCDC 1.10
> CDC Union:
> bMasterInterface 0
> bSlaveInterface 1
> CDC Ethernet:
> iMacAddress 9 9059af55826a
> bmEthernetStatistics 0x00000000
> wMaxSegmentSize 1514
> wNumberMCFilters 0x0000
> bNumberPowerFilters 0
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x82 EP 2 IN
> bmAttributes 3
> Transfer Type Interrupt
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0010 1x 16 bytes
> bInterval 9
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 1
> bAlternateSetting 0
> bNumEndpoints 0
> bInterfaceClass 10 CDC Data
> bInterfaceSubClass 0 Unused
> bInterfaceProtocol 0
> iInterface 0
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 1
> bAlternateSetting 1
> bNumEndpoints 2
> bInterfaceClass 10 CDC Data
> bInterfaceSubClass 0 Unused
> bInterfaceProtocol 0
> iInterface 10 CDC Ethernet Data
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x81 EP 1 IN
> bmAttributes 2
> Transfer Type Bulk
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0200 1x 512 bytes
> bInterval 0
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x01 EP 1 OUT
> bmAttributes 2
> Transfer Type Bulk
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0200 1x 512 bytes
> bInterval 0
> Device Qualifier (for other device speed):
> bLength 10
> bDescriptorType 6
> bcdUSB 2.00
> bDeviceClass 2 Communications
> bDeviceSubClass 0
> bDeviceProtocol 0
> bMaxPacketSize0 64
> bNumConfigurations 2
> Device Status: 0x0000
> (Bus Powered)
>
> I have two BBGW which appear fine as ttyACM0 and ttyACM1, but I haven't
> reflashed them from the stock image. Is there a way to enable this on the
> BBB image?
>
> Thanks,
> Jeremy
>
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