[LCA2019 Chat] Headless RPi setup, cdcether not working?
Joel Wirāmu Pauling
aenertia at aenertia.net
Wed Jan 30 04:26:40 AEDT 2019
It slows down the SPI bus frequency and breaks several other DTB overlays.
The sunxi stuff has proper Uarts separate to ghr GPIO which is one reason I
favour them over the real rpi.
On Tue., 29 Jan. 2019, 18:26 Marc MERLIN <marc at merlins.org wrote:
> On Tue, Jan 29, 2019 at 06:15:15PM +1300, Joel Wirāmu Pauling wrote:
> > I Enable the gpio serial it works with UART normally but due to
> > architectural issues with the broadcom SOCs can interfere with perf.
>
> Are you saying that using serial console breaks usb ethernet?
>
> > On Tue., 29 Jan. 2019, 18:02 Marc MERLIN <marc at merlins.org wrote:
> >
> > > On Tue, Jan 29, 2019 at 07:04:24AM +1100, Wes Cilldhaire wrote:
> > > >
> > > >
> > > > ----- On 26 Jan, 2019, at 7:17 PM, martin f krafft
> madduck at madduck.net
> > > wrote:
> > > > > On the Pi I just get the message
> > > >
> > > > > "udc-core: couldn't find an available UDC - added [g_cdc] to list
> > > > > of pending drivers."
> > > >
> > > > > which the article says means that I didn't enable the dwc2
> properly.
> > > >
> > > > > But hey:
> > > >
> > > > > # grep dwc /proc/cmdline
> > > > > 8250.nr_uarts=0 bcm2708_fb.fbwidth=656 bcm2708_fb.fbheight=416
> > > > > bcm2708_fb.fbswap=1 smsc95xx.macaddr=B8:27:EB:3B:08:DD
> > > > > vc_mem.mem_base=0x1ec00000 vc_mem.mem_size=0x20000000
> > > > > dwc_otg.lpm_enable=0 console=ttyS0,115200 console=tty1
> > > > > root=PARTUUID=9a617d9a-02 rootfstype=ext4 elevator=deadline
> > > > > fsck.repair=yes rootwait modules-load=dwc2,g_cdc
> > > > > ^^^^^^^^^^
> > > >
> > > > You need to add the dtoverlay=dwc2 line in config.txt as well so the
> > > device actually appears in the device tree for the module to find.
> > > >
> > > > Yes, I overlooked this step too initially, something about its
> position
> > > in the instructions seems to make one's mind skip over it :)
> > > > (null)
> > >
> > > I can't get cdc_ether working
> > >
> > > I used the rPi image that was available from the burner near rego.
> > >
> > > As indicated here, I did this:
> > > root at raspberrypi:~# grep dwc2 /boot/config.txt
> > > dtoverlay=dwc2
> > > root at raspberrypi:~# grep dwc2 /boot/*.txt
> > >
> > > /boot/cmdline.txt:dwc_otg.lpm_enable=0 console=serial0,115200
> console=tty1
> > > root=PARTUUID=b4261201-02 rootfstype=ext4 elevator=deadline
> > > fsck.repair=yes rootwait splash plymouth.ignore-serial-consoles
> > > modules-load=dwc2,g_ether
> > > /boot/config.txt:dtoverlay=dwc2
> > >
> > > interface seems to come up:
> > > [ 5.655024] dwc2 20980000.usb: 20980000.usb supply vusb_d not found,
> > > using dummy regulator
> > > [ 5.655159] dwc2 20980000.usb: 20980000.usb supply vusb_a not found,
> > > using dummy regulator
> > > [ 6.113258] dwc2 20980000.usb: EPs: 8, dedicated fifos, 4080
> entries in
> > > SPRAM
> > > [ 6.154975] dwc2 20980000.usb: DWC OTG Controller
> > > [ 6.162747] dwc2 20980000.usb: new USB bus registered, assigned bus
> > > number 1
> > > [ 6.252180] dwc2 20980000.usb: irq 33, io mem 0x20980000
> > > [ 7.044669] g_ether gadget: Ethernet Gadget, version: Memorial Day
> 2008
> > > [ 7.053989] g_ether gadget: g_ether ready
> > > [ 7.060353] dwc2 20980000.usb: bound driver g_ether
> > > [ 7.189129] dwc2 20980000.usb: new device is high-speed
> > > [ 7.236167] i2c /dev entries driver
> > > [ 7.565138] dwc2 20980000.usb: new device is high-speed
> > > [ 7.693246] dwc2 20980000.usb: new device is high-speed
> > > [ 7.766371] dwc2 20980000.usb: new address 10
> > > [ 7.787912] g_ether gadget: high-speed config #1: CDC Ethernet (ECM)
> > >
> > > I give it an IP:
> > > root at raspberrypi:~# ifconfig usb0
> > > usb0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
> > > inet 192.168.1.2 netmask 255.255.255.0 broadcast
> 192.168.1.255
> > > inet6 fe80::15e4:95ea:e740:aa7d prefixlen 64 scopeid
> 0x20<link>
> > > ether be:e6:a6:5b:35:18 txqueuelen 1000 (Ethernet)
> > >
> > > On my computer, I give it an IP too:
> > > root at raspberrypi:~# ifconfig usb0
> > > usb0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
> > > inet 192.168.1.2 netmask 255.255.255.0 broadcast
> 192.168.1.255
> > > inet6 fe80::15e4:95ea:e740:aa7d prefixlen 64 scopeid
> 0x20<link>
> > >
> > > dmesg says:
> > > Jan 28 20:38:26 saruman kernel: [728255.209791] usb 1-2: new high-speed
> > > USB device number 40 using xhci_hcd
> > > Jan 28 20:38:26 saruman kernel: [728255.358611] usb 1-2: New USB device
> > > found, idVendor=0525, idProduct=a4a2, bcdDevice= 4.14
> > > Jan 28 20:38:26 saruman kernel: [728255.358615] usb 1-2: New USB device
> > > strings: Mfr=1, Product=2, SerialNumber=0
> > > Jan 28 20:38:26 saruman kernel: [728255.358617] usb 1-2: Product:
> > > RNDIS/Ethernet Gadget
> > > Jan 28 20:38:26 saruman kernel: [728255.358619] usb 1-2: Manufacturer:
> > > Linux 4.14.79+ with 20980000.usb
> > > Jan 28 20:38:26 saruman kernel: [728255.359846] cdc_subset: probe of
> > > 1-2:1.0 failed with error -22
> > > Jan 28 20:38:26 saruman kernel: [728255.361388] cdc_ether 1-2:1.0 usb0:
> > > register 'cdc_ether' at usb-0000:00:14.0-2, CDC Ethernet Device,
> > > 62:3c:c9:7f:9d:e5
> > >
> > > Not sure if cdc_subset probe failed is bad.
> > >
> > > If I ping my computer from the rPi, I see its packets on my laptop:
> > > 20:58:43.391704 ARP, Request who-has 192.168.1.1 tell 192.168.1.2,
> length
> > > 28
> > > 20:58:43.391727 ARP, Reply 192.168.1.1 is-at 62:3c:c9:7f:9d:e5, length
> 28
> > >
> > > But no packet from my laptop never seems to make it back to the rPi.
> > >
> > > For those who got it to work, do I have the wrong rPi image or some
> > > other driver problem that causes the rPi not to get packets back in?
> > >
> > > Thanks,
> > > Marc
> > > --
> > > "A mouse is a device used to point at the xterm you want to type in" -
> > > A.S.R.
> > > Microsoft is to operating systems ....
> > > .... what McDonalds is to gourmet
> > > cooking
> > > Home page: http://marc.merlins.org/ | PGP
> > > 7F55D5F27AAF9D08
> > > --
> > > Chat mailing list
> > > Chat at lists.lca2019.linux.org.au
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> > >
>
> --
> "A mouse is a device used to point at the xterm you want to type in" -
> A.S.R.
> Microsoft is to operating systems ....
> .... what McDonalds is to gourmet
> cooking
> Home page: http://marc.merlins.org/
>
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