SR1A
uni_wr_mask(sc, VIASR, SR1A, 0x00, BIT0);
{VIASR, SR1A, 0xFB, 0x08},
{VIASR,SR1A,0xFB,0x82},
{VIASR, SR1A, 0xFF, 0x0a}, /* GFX PREQ threshold */
{VIASR, SR1A, 0xFB, 0x08},
{VIASR,SR1A,0xFB,0x08},