R600_BUS_CNTL
uint32 bus_cntl = read32(info.registers + R600_BUS_CNTL);
write32(info.registers + R600_BUS_CNTL, (bus_cntl & ~R600_BIOS_ROM_DIS));
write32(info.registers + R600_BUS_CNTL, bus_cntl);
uint32 bus_cntl = read32(info.registers + R600_BUS_CNTL);
write32(info.registers + R600_BUS_CNTL, (bus_cntl & ~R600_BIOS_ROM_DIS));
write32(info.registers + R600_BUS_CNTL, bus_cntl);
uint32 bus_cntl = read32(info.registers + R600_BUS_CNTL);
write32(info.registers + R600_BUS_CNTL, (bus_cntl & ~R600_BIOS_ROM_DIS));
write32(info.registers + R600_BUS_CNTL, bus_cntl);