Useful links Linux boot Linux/x86 boot protocol Linux kernel parameters Protected mode 64-ia-32-architectures-software-developer-vol-3a-part-1-manual.pdf Serial programming 8250 UART Programming Serial ports on OSDEV VGA Video Graphics Array (VGA) IO IO port programming GCC and GAS GCC type attributes Assembler Directives Important data structures task_struct definition Other architectures PowerPC and Linux Kernel Inside