Embedded Programming with the GNU Toolchain

-->http://www.bravegnu.org/gnu-eprog/index.html

Uboot

Upgrading homeserver hardware

-->http://blog.thebehrens.net/2009/11/22/upgrading-homeserver-hardware/

QEMU

-->http://wiki.archlinux.org/index.php/QEMU

Bare metal

-->http://wiki.openmoko.org/wiki/Bare_metal\

Simplest bare metal program for ARM

-->http://balau82.wordpress.com/2010/02/14/simplest-bare-metal-program-for-arm/

Hello world for bare metal ARM using QEMU

-->http://balau82.wordpress.com/2010/02/28/hello-world-for-bare-metal-arm-using-qemu/

U-boot for ARM on QEMU

-->http://balau82.wordpress.com/2010/03/10/u-boot-for-arm-on-qemu/

QEMU Emulator User Documentation

-->http://wiki.qemu.org/download/qemu-doc.html#Linux-User-space-emulator