CR6B
RegCR6B = viafb_read_reg(VIACR, CR6B);
viafb_write_reg(CR6B, VIACR, RegCR6B | 0x08);
viafb_write_reg(CR6B, VIACR, RegCR6B);
viafb_write_reg_mask(CR6B, VIACR, 0x01, BIT0);
viafb_write_reg_mask(CR6B, VIACR, 0x00, 0x08);
viafb_write_reg_mask(CR6B, VIACR, 0x00, BIT3);
{VIACR, CR6B, 0xFF, 0x00},
{VIACR, CR6B, 0xFF, 0x00},
{VIACR, CR6B, 0xFF, 0x00},
{VIACR, CR6B, 0xFF, 0x00},