Getting started at: Section 2.9, “Baremetal setup”
Baremetal GDB step debug
Baremetal bootloaders
Baremetal linker script
Baremetal command line arguments
Semihosting
gem5 baremetal carriage return
Baremetal host packaged toolchain
Baremetal C++
GDB builtin CPU simulator
ARM baremetal
How we got some baremetal stuff to work
Baremetal tests