Samsung Chromebook XE303C12

First generation chromebook from Samsung in 2012.

• Cannot boot from the USB 3.0 port (blue) - USB boot is only available from the 2.0 port.
• Press CTRL + U to boot from USB or CTRL + D to boot from internal disk
• low beep indicates that the machine cannot find a bootable image on the USB drive
• Check that you have run sudo crossystem dev_boot_usb=1 dev_boot_signed_only=0 - the signed image flag is important and making sure it is low (set to 0) is key.

After a Flat Battery

The crossystem values go back to default so you have to redo the steps above to enable dev boot and disabled signed boot.

ArchLinux ARM

See Samsung Chromebook 

LinARM Images

see Linarm