CM-QS600: Linux: Known Issues

Audio Output

Once some audio output (either the analog or digital) is enabled it cannot be disabled: root@cm-debian:~# alsaucm -c apq8064-tabla-snd-card set _verb HiFi set _disdev Headphones Segmentation fault root@cm-debian:~# alsaucm -c apq8064-tabla-snd-card set _verb HDMI set _disdev HDMI-stereo Segmentation fault Workaround : Reboot the device and enable only required output.

Package Manager

Public key problem is reported while retrieving new lists of packages: root@cm-debian:~# apt-get update Get:1 http://ftp.debian.org wheezy Release.gpg [2390 B] Get:2 http://ftp.debian.org wheezy Release [168 kB] ... Fetched 16.0 MB in 24s (662 kB/s) Reading package lists... Done W: There is no public key available for the following key IDs: 7638D0442B90D010 Solution : Install debian-keyring and debian-archive-keyring packages. Note : This operation requires ~50MB of additional disk space. root@cm-debian:~# apt-get install debian-keyring debian-archive-keyring

USB Device Information

Running lsusb command returns entries with device information missing ... Bus 001 Device 003: ID 0409:005a NEC Corp. HighSpeed Hub Bus 001 Device 004: ID 1bc7:0021 Bus 001 Device 005: ID 22b8:0830 Motorola PCS 2386C-HT820 ... Solution : Update USB ID list. root@cm-debian:~# update-usbids --2015-06-18 10:49:48-- http://www.linux-usb.org/usb.ids Resolving www.linux-usb.org (www.linux-usb.org)... 216.34.181.97 Connecting to www.linux-usb.org (www.linux-usb.org)|216.34.181.97|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 549314 (536K) [text/plain] Saving to: `/var/lib/usbutils/usb.ids.new' 100%[======================================>] 549,314 7.80K/s in 61s 2015-06-18 10:50:54 (8.78 KB/s) - `/var/lib/usbutils/usb.ids.new' saved [549314/549314] Done. root@cm-debian:~# lsusb ... Bus 001 Device 003: ID 0409:005a NEC Corp. HighSpeed Hub Bus 001 Device 004: ID 1bc7:0021 Telit Wireless Solutions HE910 Bus 001 Device 005: ID 22b8:0830 Motorola PCS 2386C-HT820 ...

EEPROM issue

The I2C-0 bus does not work as designed. As a result the main CM-QS600 board EEPROM is not accessible and no data can be read from it. Fix : Both h/w and s/w fixes have to be applied: Hardware fix : move the main EEPROM to the I2C-2 bus. Available on devices produced after October 2015. Software fix : add support for I2C-2 bus, add support for EEPROM on I2C-2 bus. Available from December 2015.

WLAN MAC address

CM-QS600 boards might have the same WLAN MAC address 00:03:7f:20:a2:74 that is hard-coded into the ATH6KL firmware. Additionally, the ATH6KL MAC address cannot be changed via standard Linux utilities like ifconfig because this option is not supported by the driver. Fix : Use the WLAN MAC address stored in the board EEPROM instead. Available from December 2015. Note : The above fix only applies to devices produced after October 2015, because of EEPROM issue above. Workaround : Change the WLAN MAC address by the means of softmac overriding mechanism. Put the desired WLAN MAC address into the /lib/firmware/ath6k/AR6004/hw3.0/softmac.bin file, then reboot the CM-QS600. root@cm-debian:~# echo -n -e \\x00\\x01\\x02\\x03\\x04\\x05 > /lib/firmware/ath6k/AR6004/hw3.0/softmac.bin root@cm-debian:~# hexdump -C /lib/firmware/ath6k/AR6004/hw3.0/softmac.bin 00000000 00 01 02 03 04 05 |......| 00000006

Ethernet MAC address

CM-QS600 board may have random MAC address on the eth0 network interface. Fix : Use the MAC address stored in the board EEPROM. Available from December 2015. Note : The above fix only applies to devices produced after October 2015, because of EEPROM issue above. Workaround : Change the eth0 MAC address by the means of standard Linux utilities like ifconfig: root@cm-debian:~# ifconfig eth0 down root@cm-debian:~# ifconfig eth0 hw ether 00:01:03:05:07:09 root@cm-debian:~# ifconfig eth0 up