Adventures with a Single Board Computer


Posted on Feb 6, 2014

CPU NatSemi Geode 200/233/266/300 MHz (default 233 on-board) or and follow Geode link. VGA/LCD Interface NS GX5530, shared memory 2. 5MB, support CRT display and 18-bit TFT LCD, resolution up to 1024x768 @64K colors, with VGA and 50-pin LCD connectors Given that the SBC is powered from a standard +5v, 0v, 0v, +12v power connector, I`m not sure how they


Adventures with a Single Board Computer
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measured the current consumption at -5v and -12v :-). I believe the board has no need of -5v and uses an on board -12v DC-DC inverter for the RS232 port. Power used by SBC, SB16, HardDisk and HUB is aprox 20 watts, saving aprox 2 watts when disk spins down. There is a further aprox 2 watts difference in CPU power consumption between it working flat out and being "idle". It is worth not using the "no-hlt" kernel option. sets disk to spindown on /dev/hda after 180*5 secs = 15 mins of inactivity. The -S value is multiples of 5 secs for 1-240, and multiples of 30mins for 241-251, see man page for other values. Many services continually write to or access the hard disk and prevent spindown from kicking in, or mean it spins up too frequently. Run just the services you need is always a good plan. Here are some services that I tamed. SHELL=/bin/sh PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin # m h dom mon dow user command 25 21 * * * root run-parts -report /etc/cron. daily 30 21 * * 7 root run-parts -report /etc/cron. weekly 35 21 1 * * root run-parts -report /etc/cron. monthly cleaning-interval 0; heartbeat-interval 0; statistics-interval 0; dialup yes; notify no; forward only; forwarders { 129. 11. 144. 1; }; listen-on port 53 { 127. 0. 0. 1; 192. 168. 10. 80; }; // reduce log verbosity on issues outside our control logging { category lame-servers { null; }; category statistics { null; }; category cname {...




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