Example implementations relate to booting a system comprising a system-on-a-chip (SOC) device. For example, boot code and system code comprising at least one selected from among an operating system and hypervisor code are stored in an on-chip non-volatile memory of a SoC device. By executing the boot code from the on-chip non-volatile memory, the system is booted from a mode in which power is removed from the system, where the booting includes loading the system code in the SoC device from the on-chip non-volatile memory without accessing storage off the SoC device.