#define PMC_BASE 0x7000e400
#define PMC_SCRATCH0 (PMC_BASE + 0x50)
#define PMC_CNTRL (PMC_BASE + 0x0)
#define BOOTROM_START 0xFFF00000

void _start() {
  unsigned int rom_data = *(volatile unsigned int *)(BOOTROM_START);

  *(volatile unsigned int *)(PMC_SCRATCH0) = rom_data;

  *(volatile unsigned int *)(PMC_CNTRL) |= (1 << 4);

  while (1)
    ;
}