Operating system image installation methods

We use a few different methods to install operating system images.

installation method	what files are required	how to install	references
XO-1.75 signed	.zd and fs.zip	hold down the four game pad buttons
XO-1.75 unsigned	.zd alone	check if security is disabled, if so obtain developer key and disable-security, interrupt boot, then use the fs-update command
XO-1.5 signed	.zd and fs.zip	hold down the four game pad buttons	Fedora 11 for XO-1.5 install to internal microSD Release_notes/10.1.1 Nandblaster_for_XO-1.5
XO-1.5 unsigned	.zd alone	check if security is disabled, if so obtain developer key and disable-security, interrupt boot, then use the fs-update command	F11_for_1.5 Release_notes/10.1.2 Nandblaster_for_XO-1.5
XO-1 signed	.img and fs.zip	hold down the four game pad buttons	Clean Install Procedure Nandblaster_for_XO-1
XO-1 unsigned	.img and .crc	obtain developer key, disable-security, interrupt boot, then use the copy-nand command	Clean Install Procedure Release_notes/10.1.2 Nandblaster_for_XO-1
XO-1 partitioned	.dat and .img	obtain developer key, disable-security, interrupt boot, then use the update-nand command	Used by DebXO. Used by UBIFS experiments. Technical description.

The signed installation methods are the same for XO-1.75, XO-1.5 and XO-1. This was by design, since we do not wish to increase the training burden for the deployment teams.

The unsigned installation methods depend on the type of internal storage. XO-1 has raw NAND Flash. XO-1.5 and XO-1.75 have microSD or eMMC managed Flash.