SDCMD
const uint32_t cmd = SDHOST_READ(sc, SDCMD);
SDHOST_WRITE(sc, SDCMD, 0);
SDHOST_WRITE(sc, SDCMD, cmdval | cmd->c_opcode);
SDHOST_READ(sc, SDCMD), cmd->c_error);
if ((SDHOST_READ(sc, SDCMD) & SDCMD_FAIL) != 0) {
SDHOST_READ(sc, SDCMD));