SFAS_SELECT_R
mode &= ~SFAS_SELECT_R;
nexus->ID = ((mode & SFAS_SELECT_R) ? 0xC0 : 0x80) | lun;
#define SFAS_SELECT_RS (SFAS_SELECT_R|SFAS_SELECT_S)
#define SFAS_SELECT_RI (SFAS_SELECT_R|SFAS_SELECT_I)
#define SFAS_SELECT_RSI (SFAS_SELECT_R|SFAS_SELECT_S|SFAS_SELECT_I)