R600_SCK_OVERWRITE
write32(info.registers + R600_ROM_CNTL, (rom_cntl | R600_SCK_OVERWRITE));
write32(info.registers + R600_ROM_CNTL, (rom_cntl | R600_SCK_OVERWRITE));
| (1 << R600_SCK_PRESCALE_CRYSTAL_CLK_SHIFT) | R600_SCK_OVERWRITE));