MOD-WIFI-R5370-ANT crash OlinuXino [SOLVED]

[fromcologne]

I bought a MOD-WIFI-R5370-ANT because of better antenna.

First try I build a new kernel with rt2800usb support and edited /etc/network/interfaces.
WLAN connection to my AP works fine.
But if I cause heavy traffic on the WLAN (with FTP or CIFS) my OlinuXino crashs after
30-60 seconds and reboots.

I get this messages on the UART:

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<1>Unable to handle kernel paging request at virtual address 8001a8c0
[ 4840.163294] Unable to handle kernel paging request at virtual address 8001a8c0
<1>pgd = eebe4000
[ 4840.172214] pgd = eebe4000
<1>[8001a8c0] *pgd=00000000[ 4840.177286] [8001a8c0] *pgd=00000000

<0>Internal error: Oops: 805 [#1] PREEMPT SMP ARM
[ 4840.185520] Internal error: Oops: 805 [#1] PREEMPT SMP ARM
<d>Modules linked in:[ 4840.192852] Modules linked in: lcd lcd rt2800usb rt2800usb rt2800lib rt2800lib rt2x00usb rt2x00usb rt2x00lib rt2x00lib


Next I tried the official Debian kernel (with video acceleration).
Same effect. Crash after 30-60 seconds.

My environment:
U-Boot SPL 2014.01-rc1-09161-gaf9f405 (Feb 08 2014 - 13:47:22)
Board: A20-OLinuXino_MICRO
Image Name:   Linux-3.4.79+

Some WLAN driver messages during boot:

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[    1.747717] NET: Registered protocol family 24
rtusb init rt2870 --->
[    1.754263] rtusb init rt2870 --->
sw_usb_enable_hcd: usbc_num = 2
[    1.760537] sw_usb_enable_hcd: usbc_num = 2
<6>usbcore: registered new interface driver rt2870
...
[    <2.769051]  rt2870_probe ====> pm_usage_cnt 1
...
[   10.445928] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
<7>Registered led device: rt2800usb-phy0::radio
[   10.459546] Registered led device: rt2800usb-phy0::radio
<7>Registered led device: rt2800usb-phy0::assoc
[   10.469463] Registered led device: rt2800usb-phy0::assoc
<7>Registered led device: rt2800usb-phy0::quality
[   10.479491] Registered led device: rt2800usb-phy0::quality
<6>usbcore: registered new interface driver rt2800usb
[   10.490295] usbcore: registered new interface driver rt2800usb
<30>udevd[220]: renamed network interface wlan0 to wlan7
[   10.587223] udevd[220]: renamed network interface wlan0 to wlan7
[ ok done.
...
[   26.256941] wlan7: authenticate with d4:ca:6d:26:38:bf
<7>wlan7: send auth to d4:ca:6d:26:38:bf (try 1/3)
[   26.329538] wlan7: send auth to d4:ca:6d:26:38:bf (try 1/3)
<7>wlan7: authenticated
[   26.345113] wlan7: authenticated
<7>wlan7: associate with d4:ca:6d:26:38:bf (try 1/3)
[   26.384447] wlan7: associate with d4:ca:6d:26:38:bf (try 1/3)
<7>wlan7: RX AssocResp from d4:ca:6d:26:38:bf (capab=0x431 status=0 aid=6)
[   26.405279] wlan7: RX AssocResp from d4:ca:6d:26:38:bf (capab=0x431 status=0 aid=6)
<6>ADDRCONF(NETDEV_CHANGE): wlan7: link becomes ready
[   26.452123] ADDRCONF(NETDEV_CHANGE): wlan7: link becomes ready
<7>wlan7: associated
[   26.460013] wlan7: associated


Any idea what´s going wrong?

[Javier]

Hi fromcologne,

I am not sure if rt2800usb is the right driver for this device.  Certainly lots of Raspberry Pi people use it (e.g. https://www.modmypi.com/blog/how-to-set-up-the-ralink-rt5370-wifi-dongle-on-raspian), and the Debian wiki lists it in the supported devices for that driver (https://wiki.debian.org/rt2800usb#supported).

But the kernel documentation says not: http://wireless.kernel.org/en/users/Drivers/rt2800usb#Unsupported_chips.  It suggests using the manufacturer's driver instead: http://www.mediatek.com/en/downloads/rt8070-rt3070-rt3370-rt3572-rt5370-rt5372-rt5572-usb-usb/.

If you want to try that driver instead, please let us know how you get on.

Best wishes,
Javier.

[jhomann]

Hi,

did you manage to get the ralink driver running? Is the driver able to work in 80211n mode? Is the connection stable on heavy load?

regards,
Jan

[fromcologne]

I think the original Ralink driver is part of the official Olimex Debian kernel.
But it crashes too.
To compile the ralink driver is quiet difficult. I have to edit a lot of parameters
in makefile and config.mk. Documentation is difficult to understand.
The MOD-WIFI-RTL8188 is running well, but it´s incredible slow.
I search for a better supported chipset or use a cable instead.

[fromcologne]

Maybe I solved the problem with the MOD-WIFI-R5370-ANT.

If I plug in this WLAN dongle I see an error message on TTY

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<3>ERROR: 256 KiB atomic DMA coherent pool is too small!
Please increase it with coherent_pool= kernel parameter!


Same message appears if the boards reboots with plugged in dongle.

I edited the file uEnv.txt on /dev/mmcblk0p1 and added one line

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coherent_pool=1M

After a reboot the dongle works.