SMBHSTCNT_BYTE
viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_BYTE);
viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_START | SMBHSTCNT_BYTE);
viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_BYTE);
viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_START | SMBHSTCNT_BYTE);