Difference between revisions of "ODROID"
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==== Wireless Networking ==== | ==== Wireless Networking ==== | ||
− | Wireless communications seem to be very troublesome, as the network interfaces tend to lose or drop a lot of packages, both in RX and TX, to the point that a reliable SSH connection cannot be established. This happens at least with the "officially supported" wireless NIC (with a Realtek | + | Wireless communications seem to be very troublesome, as the network interfaces tend to lose or drop a lot of packages, both in RX and TX, to the point that a reliable SSH connection cannot be established. This happens at least with the "officially supported" wireless NIC (with a Realtek RTL8191SU chipset), even if the wifi signal strength is excellent. |
+ | |||
+ | This being said, the RTL8191SU adapter loses some packets along the way also while being connected to other computers, so maybe it's really not the best USB wifi adapter ''ever''. | ||
root@odroid:~# ifconfig wlan6 | root@odroid:~# ifconfig wlan6 |
Revision as of 18:14, 19 May 2013
There are two ODROID U2 for development of small robots. Here are details and suggestions for their use.
Contents
Useful How-Tos
- Kernel recompiling process for the ODROID-U2; it is necessary to do this if you ever wish to install external/out-of-tree drivers, as the "official package" is missing several critical kernel headers.
Unresolved issues
Wireless Networking
Wireless communications seem to be very troublesome, as the network interfaces tend to lose or drop a lot of packages, both in RX and TX, to the point that a reliable SSH connection cannot be established. This happens at least with the "officially supported" wireless NIC (with a Realtek RTL8191SU chipset), even if the wifi signal strength is excellent.
This being said, the RTL8191SU adapter loses some packets along the way also while being connected to other computers, so maybe it's really not the best USB wifi adapter ever.
root@odroid:~# ifconfig wlan6 wlan6 Link encap:Ethernet HWaddr **:**:**:**:**:** inet addr:192.168.1.60 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::ee1a:59ff:fe0e:f122/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:453 errors:0 dropped:600 overruns:0 frame:0 TX packets:292 errors:0 dropped:7 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:79264 (79.2 KB) TX bytes:35116 (35.1 KB)
odroid@odroid:~$ iwconfig wlan6 wlan6 IEEE 802.11bg ESSID:"MyWirelessNet" Nickname:"<WIFI@REALTEK>" Mode:Managed Frequency:2.437 GHz Access Point: **:**:**:**:**:** Bit Rate:54 Mb/s Sensitivity:0/0 Retry:off RTS thr:off Fragment thr:off Encryption key:****-****-****-****-****-****-****-**** Security mode:open Power Management:off Link Quality=100/100 Signal level=100/100 Noise level=0/100 Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0
Realtek RTL8192CU
This chipset seems not to be even detected by the stock HK kernel, but it is possible to use it after recompiling the kernel, disabling the in-kernel module for the NIC, and integrating Realtek's official driver for this chipset inside it (instructions are included in the package).
However, you still get a huge packet loss rate, even if you disable the power saving feature of the driver by loading the kernel module with
sudo modprobe 8192cu rtw_power_mgnt=0
Tested OS and versions
- Xubuntu 13.04 for armhf architectures, released by HardKernel with their modified Linux kernel, version 3.0.75. The kernel can be recompiled for using 3D video acceleration but this would prevent USB video cameras to work, so it's useless for robot development (even more so since OpenCL can't be even used).
Note: in this version of the OS, the lshw command seems to be partly broken, but this is resolved by calling it with
sudo lshw -disable dmi
although this will prevent the detection of certain features of the board.
Tested I/O devices
Monitors
Monitors need a native HDMI interface to work with ODROIDs due to the strict requirements of the Exynos system-on-chip; for the same reason, external HDMI-to-DVI adapters are also not recommended, as you could result having a blank image screen (source )
This is a list of monitors and TV screens with native HDMI ports that are known to work.
- Sony KDL-32V4500
- Samsung Syncmaster XL2370 HD