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authorficus <ficus@robocracy.org>2012-11-17 20:22:52 +0100
committerficus <ficus@robocracy.org>2012-11-17 20:22:52 +0100
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parente90098fff6f16de245948ba4a7782596e516c74a (diff)
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-
-torouter is intended to boot and run from an SD. It could theoretically also
-run from an internal microSD card, a USB stick, or an eSATA drive, but
-specifying use of the SD card makes support, development, and documentation
-easier. The SD card can easily be popped out of the router and reflashed with a
-new image.
-
-The SD card should be at least 2GB in size and support reasonable read/write
-speeds, so probably a "class 6" quality card.
-
-You really should get a decent card: there can be an order of magnitude
-difference in performance between a cheap card and a fast card.
-
-A quick (but inconclusive?) way to check read and write card performance on a
-high-performance machine:
-
- $ # unmount the card for read test
- $ hdparm -t /dev/sdb # iff /dev/sdb is the card
- $ # mount the card for write test
- $ dd count=10 bs=1M if=/dev/urandom of=/mnt/disktest
-
-
-HOWTO Flash to an SD Card
-----------------------------
-
-Insert a 4GB+ SD card into to your dev computer (using an adapter if
-necessary). ALL DATA AND PARTITIONS WILL BE DELETED.
-
-Use lsblk to figure out which block device the card is (eg, /dev/sdc).
-
-Copy over the image (eg, binary.img) with the dd utility:
-
- $ dd if=binary.img of=/dev/sdc bs=1M
-
-
-Potential Improvements
--------------------------
-
-Block-aligned partitions may give significantly better write performance:
-
-http://linux-howto-guide.blogspot.de/2009/10/increase-usb-flash-drive-write-speed.html
-http://www.olpcnews.com/forum/index.php?topic=4993.0