LM006 not working on iMX6

Technical Support
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1

I am having issues with the LM006 on the iMX6. I’m using BSP version 2.8b4 and building the angstrom-qt5-x11-image image. I expected it to work without kernel modification based on this page: High performance, low power Embedded Computing Systems | Toradex Developer Center

You can see the failure here:

[ 185.263077] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 185.278316] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 185.286538] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[ 185.295285] platform regulatory.0: Falling back to user helper
[ 185.306947] cfg80211: failed to load regulatory.db
[ 185.518402] usb 2-1.2: Vendor: Realtek
[ 185.522214] usb 2-1.2: Product: 802.11n WLAN Adapter
[ 185.527274] usb 2-1.2: rtl8192cu_parse_efuse: dumping efuse (0x80 bytes):
[ 185.534148] usb 2-1.2: 00: 29 81 00 74 cd 00 00 00
[ 185.538996] usb 2-1.2: 08: ff 00 da 0b 76 81 03 41
[ 185.543853] usb 2-1.2: 10: 32 00 85 62 9e ad 34 c9
[ 185.548679] usb 2-1.2: 18: f0 87 a8 3d 0a 03 52 65
[ 185.553537] usb 2-1.2: 20: 61 6c 74 65 6b 00 16 03
[ 185.558367] usb 2-1.2: 28: 38 30 32 2e 31 31 6e 20
[ 185.563246] usb 2-1.2: 30: 57 4c 41 4e 20 41 64 61
[ 185.568071] usb 2-1.2: 38: 70 74 65 72 00 00 00 00
[ 185.572941] usb 2-1.2: 40: 00 00 00 00 00 00 00 00
[ 185.577760] usb 2-1.2: 48: 00 00 00 00 00 00 00 00
[ 185.582590] usb 2-1.2: 50: 00 00 00 00 00 00 00 00
[ 185.587467] usb 2-1.2: 58: 06 00 2a 2a 2a 00 00 00
[ 185.592295] usb 2-1.2: 60: 2a 2a 2a 00 00 00 00 00
[ 185.597151] usb 2-1.2: 68: 00 00 00 00 04 04 04 00
[ 185.601963] usb 2-1.2: 70: 00 00 00 00 00 02 00 00
[ 185.606837] usb 2-1.2: 78: 10 00 00 00 36 00 81 00
[ 185.611687] usb 2-1.2: RTL8188CU rev A (TSMC) 1T1R, TX queues 2, WiFi=1, BT=0, GPS=0, HI PA=0
[ 185.620358] usb 2-1.2: RTL8188CU MAC: 34:c9:f0:87:a8:3d
[ 185.625668] usb 2-1.2: rtl8xxxu: Loading firmware rtlwifi/rtl8192cufw_TMSC.bin
[ 185.642866] usb 2-1.2: Firmware revision 80.0 (signature 0x88c1)
[ 185.671640] usb 2-1.2: rtl8xxxu_writeN: Failed to write block at addr: 1480 size: 0080
[ 186.186453] rtl8xxxu: probe of 2-1.2:1.0 failed with error -11
[ 186.192479] usbcore: registered new interface driver rtl8xxxu

Also, the lsusb output:

root@apalis-imx6:~# lsusb

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 003: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN Adapter
Bus 002 Device 002: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Running opkg update; opkg --force-depends install linux-firmware does not resolve my issue.

When I did run opkg --force-depends install linux-firmware, I did see the following error:

Collected errors: check_data_file_clashes: Package linux-firmware-rtl8188 wants to install file /lib/firmware/rtlwifi/rtl8188eufw.bin But that file is already provided by package linux-firmware-rtl8188eu

I have also confirmed that the LM006 dongle works by plugging it into my Ubuntu 18.04 laptop. Do you have any insight into why this is not working on the iMX6?

2

hi @justin.mcdowell

Have you done any changes to the files (local.conf, bblayers.conf, …) before compiling the angstrom-qt5-x11-image? If yes, could you share these changes?

Additionally could you flash regular Bsp image and check if your dongle is working?

Thanks and best regards, Jaski

3

I apologize, I should have thought through my u-boot changes before posting this question.

It is ok, this can happen.

Perfect, that the issue is solved. Thanks for the feedback.

4

Jaski, thanks for your quick response. It turns out my issue is caused by my change to the bootcmd u-boot environment variable in order to check if an upgrade package is available over USB before booting. When I changed back to the default u-boot environment, I no longer have an issue with the LM006 usb dongle.

I apologize, I should have thought through my u-boot changes before posting this question.

FWIW, my offending bootcmd was:

bootcmd=if test ${just_flashed} = 1; then setenv just_flashed 0; saveenv; else; usb start; if test -e usb 0:1 ${usb_flash_script}; then setenv just_flashed 1; saveenv; setenv interface usb; setenv drive 0; load ${interface} ${drive}:1 ${loadaddr} flash_blk.img && source ${loadaddr}; run update; fi; fi; run emmcboot; echo; echo emmcboot failed; run distro_bootcmd; usb start; setenv stdout serial,vga; setenv stdin serial,usbkbd