SDA_CMDF_BUSY
if ((c->c_flags & (SDA_CMDF_BUSY | SDA_CMDF_DAT)) == 0) {
while ((c->c_flags & (SDA_CMDF_BUSY | SDA_CMDF_DAT)) != 0)
c->c_flags |= SDA_CMDF_BUSY;
sda_cmd_notify(cmdp, SDA_CMDF_BUSY | SDA_CMDF_DAT,
sda_cmd_notify(cmdp, SDA_CMDF_BUSY | SDA_CMDF_DAT, rv);
sda_cmd_notify(cmdp, SDA_CMDF_BUSY, rv);