!!! Raspberry Pi
A new gadget, see [http://www.raspberrypi.org].
[{TableOfContents }]
!! Installation , operation.
Make sure you have a micro USB power supply that offers enough current (at least 700 mA) and good voltage. Use a voltmeter in case of doubt.\\
I had a 2 GB SD Card (the absolute minimum), and installed the default __Raspbian “wheezy”__ on it, see [http://www.raspberrypi.org/downloads].
\\
After downloading and verifying the SHA1, you can unzip it and also check the partitions in it :
{{{
metskem@athena ~/Downloads $ ls -l 2012-12-16-wheezy-raspbian.img
-rw-r--r-- 1 metskem metskem 1939865600 Jan 4 20:52 2012-12-16-wheezy-raspbian.img
metskem@athena ~/Downloads $ file 2012-12-16-wheezy-raspbian.img
metskem@athena ~/Downloads $ sudo dd if=2012-12-16-wheezy-raspbian.img of=/dev/sdb bs=4M
462+1 records in
462+1 records out
1939865600 bytes (1.9 GB) copied, 243.748 s, 8.0 MB/s
metskem@athena ~/Downloads $
}}}
Stick the network cable in, and stick the power cable in.\\
You should see the red LED (PWR) see lighting up, and also after a few seconds all (4) other green and yellow LEDs.\\
If not, either your power supply is insufficient or your SD card is not properly formatted with the right 2 partitions (that was the case with me the first time).
After booting up the first challenge is to find out the IP address it got (DHCP), so I wrote a small shell script the iterates over all 25 addresses in the range and tries to ''ssh pi@${address} ''.
After first login (user pi password raspberry), you are advised to run the ''sudo raspi-config'' script.
I did that to "Expand root partition to fill SD card", and set the Timezone and Locale properly.
! Some "screenshots"
{{{
metskem@athena ~/Downloads $ ssh pi@10.0.0.171
Linux raspberrypi 3.2.27+ #250 PREEMPT Thu Oct 18 19:03:02 BST 2012 armv6l
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Sat Jan 5 14:59:34 2013 from 10.0.0.164
}}}
{{{
pi@raspberrypi ~ $ df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 1.8G 1.5G 238M 86% /
/dev/root 1.8G 1.5G 238M 86% /
devtmpfs 220M 0 220M 0% /dev
tmpfs 44M 200K 44M 1% /run
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 88M 0 88M 0% /run/shm
/dev/mmcblk0p1 56M 17M 40M 30% /boot
}}}
{{{
pi@raspberrypi ~ $ sudo fdisk -l
Disk /dev/mmcblk0: 1967 MB, 1967128576 bytes
4 heads, 16 sectors/track, 60032 cylinders, total 3842048 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00017b69
Device Boot Start End Blocks Id System
/dev/mmcblk0p1 8192 122879 57344 c W95 FAT32 (LBA)
/dev/mmcblk0p2 122880 3842047 1859584 83 Linux
}}}
{{{
pi@raspberrypi ~ $ cat /proc/cpuinfo
Processor : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS : 697.95
Features : swp half thumb fastmult vfp edsp java tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part : 0xb76
CPU revision : 7
Hardware : BCM2708
Revision : 000e
Serial : 0000000095619558
}}}
{{{
pi@raspberrypi ~ $ uname -a
Linux raspberrypi 3.2.27+ #250 PREEMPT Thu Oct 18 19:03:02 BST 2012 armv6l GNU/Linux
pi@raspberrypi ~ $
}}}
!! Reboot after plugging in USB stick
Because I only had a 2GB SD Card (I already ordered a 16GB class 10 card, next week in) and want to put more stuff on it, I inserted an extra USB stick in, this immediately made 4 of 5 LEDs go out. I suspect this required a short peak of current making the voltage reduce too much. It did automatically reboot and was back up in about 30 seconds.
!! Performance
The performance of the thing is (as expected) not as we are used to with our Intel boxes. Also having a slow SD card makes the thing even slower. If you use ''top'' you see a lot of IOWAIT.