Now that we have the USB issue solved, we have to ensure that the driver for our dongle is being included as shown earlier. This can be verified by
make linux-nconfig and under
Device Drivers->Network Device Support->Wireless Lan->Atheros/Qualcom devices being enabled, and support for
Atheros HTC based wireless cards also being checked. The firmware itself for our dongle must also be enabled in buildroot via
Target Packages->Hardware Handling->Firmware->Linux-firmware->Wifi firmware->Atheros 9271. The process is the same for other WiFi dongles. When you plug the dongle in, you should be seeing the following in dmesg or the terminal:
usb 1-1: new full-speed USB device number 3 using at91_ohci usb 1-1: New USB device found, idVendor=0cf3, idProduct=9271 usb 1-1: New USB device strings: Mfr=16, Product=32, SerialNumber=48 usb 1-1: Product: USB2.0 WLAN usb 1-1: Manufacturer: ATHEROS usb 1-1: SerialNumber: 12345 .... ------------[ cut here ]------------ WARNING: CPU: 0 PID: 3 at drivers/usb/core/urb.c:471 usb_submit_urb+0x24c/0x488 usb 1-1: BOGUS urb xfer, pipe 1 != type 3 Modules linked in: CPU: 0 PID: 3 Comm: kworker/0:0 Tainted: G W 4.15.18 #4 Hardware name: Atmel AT91SAM9 Workqueue: events request_firmware_work_func [<c010734c>] (unwind_backtrace) from [<c0105344>] (show_stack+0x10/0x14) [<c0105344>] (show_stack) from [<c010e364>] (__warn+0xd4/0xec) [<c010e364>] (__warn) from [<c010e3b0>] (warn_slowpath_fmt+0x34/0x44) [<c010e3b0>] (warn_slowpath_fmt) from [<c02e8874>] (usb_submit_urb+0x24c/0x488) [<c02e8874>] (usb_submit_urb) from [<c02d7e44>] (hif_usb_send+0x268/0x2b8) [<c02d7e44>] (hif_usb_send) from [<c02d854c>] (ath9k_wmi_cmd+0x124/0x178) [<c02d854c>] (ath9k_wmi_cmd) from [<c02dd364>] (ath9k_regwrite+0xd8/0xdc) [<c02dd364>] (ath9k_regwrite) from [<c02b7994>] (ath9k_hw_init_pll+0x2b8/0x56c) [<c02b7994>] (ath9k_hw_init_pll) from [<c02b9398>] (ath9k_hw_disable+0x40/0x48) [<c02b9398>] (ath9k_hw_disable) from [<c02ddce4>] (ath9k_htc_probe_device+0x6fc/0x870) [<c02ddce4>] (ath9k_htc_probe_device) from [<c02d6738>] (ath9k_htc_hw_init+0x10/0x30) [<c02d6738>] (ath9k_htc_hw_init) from [<c02d78d4>] (ath9k_hif_usb_firmware_cb+0x54c/0x5f4) [<c02d78d4>] (ath9k_hif_usb_firmware_cb) from [<c028d004>] (request_firmware_work_func+0x38/0x60) [<c028d004>] (request_firmware_work_func) from [<c011f6a4>] (process_one_work+0x1b8/0x2fc) [<c011f6a4>] (process_one_work) from [<c0120218>] (worker_thread+0x2b0/0x428) [<c0120218>] (worker_thread) from [<c0123f14>] (kthread+0xfc/0x114) [<c0123f14>] (kthread) from [<c01024e0>] (ret_from_fork+0x14/0x34) ---[ end trace 58ebef53bfa50e07 ]--- ....
Ugh, more issues?
What the heck is this
usb 1-1: BOGUS urb xfer, pipe 1 != type 3 doing spamming our console? Looking around, there has been some work on this, and someone else getting this issue. Sadly, there is no trivial proper fix for this.
This requires a little setup first though! When writing this guide, I had only two dongles on hand, an OurLink AC600 that is based on an
8812au which only has an OOT (Out Of Tree or not mainlined into Linux) driver. There are no plans to upstream the 8812au relevant code because the driver quality is apparently very poor and there isn't enough interest to clean it up, especially considering it's 5 years old at this point. Instead, I am using the RNX-N150HG which is based off the Atheros 9271. Unfortunately, the driver doesn't currently support USB Full Speed, which is all the SAM9N12 can muster. You say it's USB 2.0 though, it should therefore do Full Speed! Well, that's marketing for ya, calling something USB 2.0 which should therefore support USB High-Speed (480 Mbps) when it actually can only handle USB Full-Speed (12 Mbps).
Well, the driver says it's not supported to run at Full-Speed, not that it doesn't work. In my experience it seems to work 9/10th of the time when booting, so good enough for me. Instead, let's work on getting rid of
usb 1-1: BOGUS urb xfer, pipe 1 != type 3 spam we get in the dongle. We can just disable all logging via
dmesg -n 1 but then we loose other potentially relevant information. Instead, we can change
drivers/usb/core/urb.c where this issue happens, which will make the warning show up only once. We could have used
dev_warn_ratelimited(...) instead, to rate limit the warning so it only shows up at most 10 times every 5 seconds, but I found this to still spam the logs too much.
[hak8or@hak8or linux_commit]$ cat 0001-USB-Bogus-Pipe-warning-rate-limited.patch From 41595efeebbae49555ac1917d0adaee98d1fa4ee Mon Sep 17 00:00:00 2001 From: Marcin Ziemianowicz <email@example.com> Date: Tue, 1 May 2018 22:54:52 -0400 Subject: [PATCH] USB: Bogus Pipe warning rate limited Fix for just my board to prevent errors from overflow our logs. This error is not critical but happens extremely often due to a driver issue which I am fine with. This will never be mainlined since it's a hack. --- drivers/usb/core/urb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c index f51750bc..17ef20fc 100644 --- a/drivers/usb/core/urb.c +++ b/drivers/usb/core/urb.c @@ -475,7 +475,7 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags) /* Check that the pipe's type matches the endpoint's type */ if (usb_urb_ep_type_check(urb)) - dev_WARN(&dev->dev, "BOGUS urb xfer, pipe %x != type %x\n", + dev_warn_once(&dev->dev, "BOGUS urb xfer, pipe %x != type %x\n", usb_pipetype(urb->pipe), pipetypes[xfertype]); /* Check against a simple/standard policy */ -- 2.17.0
Now our boot log looks much cleaner, though we did loose out on the stack trace, but we know where this is coming from anyways so oh well.
usb 1-1: new full-speed USB device number 2 using at91_ohci usb 1-1: New USB device found, idVendor=0cf3, idProduct=9271 usb 1-1: New USB device strings: Mfr=16, Product=32, SerialNumber=48 usb 1-1: Product: USB2.0 WLAN usb 1-1: Manufacturer: ATHEROS usb 1-1: SerialNumber: 12345 usb 1-1: ath9k_htc: Firmware ath9k_htc/htc_9271-1.4.0.fw requested usb 1-1: ath9k_htc: Transferred FW: ath9k_htc/htc_9271-1.4.0.fw, size: 51008 usb 1-1: BOGUS urb xfer, pipe 1 != type 3 ath9k_htc 1-1:1.0: ath9k_htc: HTC initialized with 33 credits ath9k_htc 1-1:1.0: ath9k_htc: FW Version: 1.4 ath9k_htc 1-1:1.0: FW RMW support: On ieee80211 phy0: Atheros AR9271 Rev:1
Next comes being able to connect to a secure network (WPA2 in my case). For that you need a Supplicant) which can handle WPA, in our case being WPA Supplicant. Sadly it is huge at a whopping 408 kB, and after fiddling with it's
defconfig I wasn't able to find any way to greatly and easily reduce it's size. It also doesn't support kconfig and therefore menuconfig, so the attempts were mostly trial and error due to the lack of dependancy information. Enable it in buildroot via a
make nconfig, and configuring it can be done as per a few great guides, like this from LFS, this from gentoo, or this from, of course, Arch. Lastly, we need
52 kB) because it is extremely helpful for interfacing with wireless networks, and dhcpd (only
92 kB) to get an IPv4 address.
[hak8or@CT108 buildroot-2018.02.1]$ ls -la --block-size=k output/images/ total 3305K drwxr-xr-x 2 hak8or hak8or 1K May 2 05:21 . drwxr-xr-x 6 hak8or hak8or 1K May 2 03:25 .. -rw-r--r-- 1 hak8or hak8or 18K May 2 05:21 at91sam9n12ek_custom.dtb -rw-r--r-- 1 hak8or hak8or 1476K May 2 05:35 rootfs.squashfs -rw-r--r-- 1 hak8or hak8or 1748K May 2 05:21 zImage
To connect to a WiFi network we need to create the WiFi login key and then tell wpa_supplicant to actually connect.
# Create a file containing the login credentials. wpa_passphrase OpenWrt ssidpassword > /tmp/w.conf # Connect to the network using the login credentials. wpa_supplicant -B -i wlan0 -c /tmp/w.conf # Get a IPv4 address using dhcpd if it didn't fetch one automatically. dhcpd
And now we have a connection!
# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: sit0@NONE: <NOARP> mtu 1480 qdisc noop qlen 1000 link/sit 0.0.0.0 brd 0.0.0.0 3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq qlen 1000 link/ether 68:1c:a2:01:17:0b brd ff:ff:ff:ff:ff:ff inet 192.168.1.227/24 brd 192.168.1.255 scope global wlan0 valid_lft forever preferred_lft forever # ping hak8or.com PING hak8or.com (188.8.131.52): 56 data bytes 64 bytes from 184.108.40.206: seq=0 ttl=50 time=21.703 ms 64 bytes from 220.127.116.11: seq=1 ttl=49 time=24.823 ms 64 bytes from 18.104.22.168: seq=2 ttl=49 time=19.870 ms 64 bytes from 22.214.171.124: seq=3 ttl=50 time=24.777 ms ^C --- hak8or.com ping statistics --- 4 packets transmitted, 4 packets received, 0% packet loss round-trip min/avg/max = 19.870/22.793/24.823 ms
What about the mention of
cfg80211: failed to load regulatory.db? Well, after a decent bit of googling, turns out this is related to regulatory issues of what areas are allowed to use what channels for Wifi. A recent update to the Linux kernel resulted in needing to use
crda (which is a monsterous 320 kB) just to communicate with the kernel this regulatory information.
# Boot log ... sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver NET: Registered protocol family 17 Loading compiled-in X.509 certificates cfg80211: Loading compiled-in X.509 certificates for regulatory database cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7' platform regulatory.0: Direct firmware load for regulatory.db failed with error -2 cfg80211: failed to load regulatory.db # iw reg get global country 00: DFS-UNSET (2402 - 2472 @ 40), (6, 20), (N/A) (2457 - 2482 @ 20), (6, 20), (N/A), AUTO-BW, PASSIVE-SCAN (2474 - 2494 @ 20), (6, 20), (N/A), NO-OFDM, PASSIVE-SCAN (5170 - 5250 @ 80), (6, 20), (N/A), AUTO-BW, PASSIVE-SCAN (5250 - 5330 @ 80), (6, 20), (0 ms), DFS, AUTO-BW, PASSIVE-SCAN (5490 - 5730 @ 160), (6, 20), (0 ms), DFS, PASSIVE-SCAN (5735 - 5835 @ 80), (6, 20), (N/A), PASSIVE-SCAN (57240 - 63720 @ 2160), (N/A, 0), (N/A)
By default we can seem to access all channels, and the device does currently work, so good enough for me. Therefore, we won't go over installing CRDA and getting it to work, partly because I also wasn't able to get it to work.
Next up we will install some packages and play around a bit.