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Old 11-18-2019, 07:21 AM   #1
reverse_cheese_process
LQ Newbie
 
Registered: Nov 2019
Posts: 2

Rep: Reputation: Disabled
Unable to detect wifi hardware on an owasys microcontroller running debian 9.


Initially after SSHing into the microcontroller I was able to get the wifi on with this line.


Code:
ip link set mlan0 up
Subsequent running of iwconfig would display mlan0 in the list of the devices.

Next day after the microcontroller has been switched of for the night I am unable to replicate that set up.

Output of runnng lsmod:

Quote:
Module Size Used by

musb_dsps 20480 0

musb_hdrc 98304 1 musb_dsps

udc_core 28672 1 musb_hdrc

usbcore 204800 1 musb_hdrc

phy_am335x 16384 2

phy_am335x_control 16384 1 phy_am335x

phy_generic 16384 1 phy_am335x

usb_common 16384 5 phy_am335x,udc_core,musb_hdrc,musb_dsps,usbcore

c_can_platform 16384 0

c_can 20480 1 c_can_platform

mcp251x 20480 0

snd_soc_tlv320aic31xx 36864 1

can_dev 24576 2 mcp251x,c_can

musb_am335x 16384 0

omap_wdt 16384 0

sd8xxx 552960 0

mlan 430080 1 sd8xxx

cfg80211 266240 1 sd8xxx

ppp_generic 36864 0

slhc 16384 1 ppp_generic

owa4x_gpio 16384 0

ip_tables 24576 0

x_tables 32768 1 ip_tables

output of running iwconfig -a does not list mlan0, which it did first time around:

Quote:
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500

inet 192.168.8.244 netmask 255.255.255.0 broadcast 192.168.8.255

inet6 fe80::eb2:b7ff:fed8:9bd6 prefixlen 64 scopeid 0x20<link>

inet6 fdf4:7177:49ee:0:eb2:b7ff:fed8:9bd6 prefixlen 64 scopeid 0x0<global>

ether*:b2:b7:d8:9b:d6 txqueuelen 1000 (Ethernet)

RX packets 456 bytes 40141 (39.2 KiB)

RX errors 0 dropped 0 overruns 0 frame 0

TX packets 346 bytes 59107 (57.7 KiB)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

device interrupt 51


eth0:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500

inet 192.168.10.1 netmask 255.255.255.0 broadcast 0.0.0.0

ether :b2:b7:d8:9b:d6 txqueuelen 1000 (Ethernet)

device interrupt 51


lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536

inet 127.0.0.1 netmask 255.0.0.0

inet6 ::1 prefixlen 128 scopeid 0x10<host>

loop txqueuelen 1000 (Local Loopback)

RX packets 0 bytes 0 (0.0 B)

RX errors 0 dropped 0 overruns 0 frame 0

TX packets 0 bytes 0 (0.0 B)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

this is what I get if I run dmesg:

Quote:
[ 5.939860] mlan: loading out-of-tree module taints kernel.

[ 6.398869] systemd-journald[107]: Received request to flush runtime journal from PID 1

[ 6.418469] wlan: Loading MWLAN driver

[ 6.480709] wlan: Driver loaded successfully
I suspect `loading out-of-tree module taints kernel` maybe is an issue but I do not know how to proceed further.

In all other logs there is no mention of anything relating to wlan/mlan.


I have tried unloading the modules in question and restarting the whole networking:


Code:
sudo rmmod sd8xxx

sudo rmmod mlan

modprobe sd8xx

modprobe man

/etc/init.d/networking restart

This still has not fixed the problem.


Besides refreshing the whole system and hoping it works just like the first time I do not really know how to proceed with trying to fix this issue or even what further debugging to undertake.

Thanks for your help.

Last edited by reverse_cheese_process; 11-18-2019 at 03:47 PM.
 
Old 11-18-2019, 09:51 PM   #2
frankbell
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Registered: Jan 2006
Location: Virginia, USA
Distribution: Slackware, Ubuntu MATE, Mageia, and whatever VMs I happen to be playing with
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Does the command lspci detect the wireless chipset?
 
Old 11-19-2019, 06:33 AM   #3
reverse_cheese_process
LQ Newbie
 
Registered: Nov 2019
Posts: 2

Original Poster
Rep: Reputation: Disabled
lspci gives out no output, I think it's possible this MCU does not have a PCI. Many ARM SOCs indeed don't have a PCI bus.

I can navigate to /proc/bus/pci but the file is empty.

hwinfo --short gives this list which is missing mlan

Quote:
network:
eth0 ARM Ethernet 0
can2 ARM Ethernet 0
can1 ARM Ethernet 0
network interface:
can4 Network Interface
can2 Network Interface
sit0 Network Interface
lo Loopback network interface
can3 Network Interface
can1 Network Interface
eth0 Ethernet network interface

running hwinfo gives

Quote:
arm
description: ARMv7 Processor rev 2 (v7l)
product: Owa4x board 1.0.10
width: 32 bits
*-core
description: Motherboard
physical id: 0
*-cpu:0
description: CPU
product: cpu
physical id: 0
bus info: cpu@0
capabilities: half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
*-cpu:1 DISABLED
description: CPU
product: idle-states
physical id: 1
bus info: cpu@1
*-memory
description: System memory
physical id: 2
size: 494MiB
*-usbhost:0
product: MUSB HDRC host driver
vendor: Linux 4.14.67-1.0.7+ musb-hcd
physical id: 1
bus info: usb@1
logical name: usb1
version: 4.14
capabilities: usb-2.00
configuration: driver=hub slots=1 speed=480Mbit/s
*-usbhost:1
product: MUSB HDRC host driver
vendor: Linux 4.14.67-1.0.7+ musb-hcd
physical id: 2
bus info: usb@2
logical name: usb2
version: 4.14
capabilities: usb-2.00
configuration: driver=hub slots=1 speed=480Mbit/s
*-network
description: Ethernet interface
physical id: 3
logical name: eth0
serial: :b2:b7:d8:9b:d6
capabilities: ethernet physical
configuration: broadcast=yes driver=cpsw driverversion=1.0 ip=192.168.8.244 link=yes multicast=yes
 
  


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