MC_CNTL_SPEED_SHIFT
{0x6 << MC_CNTL_SPEED_SHIFT, 0},
{0x5 << MC_CNTL_SPEED_SHIFT, 32},
{0x4 << MC_CNTL_SPEED_SHIFT, 64},
{0x3 << MC_CNTL_SPEED_SHIFT, 128},
{0x2 << MC_CNTL_SPEED_SHIFT, 256},
{0x1 << MC_CNTL_SPEED_SHIFT, 512},
{0x0 << MC_CNTL_SPEED_SHIFT, 1024}