( Now we need to repeatedly run CMD55+CMD41 (0x40000000)
  until the card goes out of idle mode, that is, when it stops
  sending us 0x01 response and send us 0x00 instead. Any other
  response means that initialization failed. )
    BEGIN
        0x77 0 0 SDCMDR1  ( CMD55 )
        0x01 = NOT IF _err THEN
        0x69 0x4000 0x0000 SDCMDR1  ( CMD41 )
        DUP 0x01 > IF _err THEN
    NOT UNTIL
    ( Out of idle mode! Success! )
;