[PATCH 4/5] mtd: nand: add support for Micron on-die ECC

[Bean Huo (beanhuo)]

Hi, Boris and Thomas

>>
>> Ok, but I recommend that 70s should be the first choice on this single
>> solution, it doesn't need to read twice to detect its bitflips count.
>
>That's exactly why we need to differentiate the 2 chips.

Sorry for later this response. 
Below is the pseudo codes about how to differentiate these 2 series parallel
NAND with on-die ECC:

if (NAND == SLC ) { // on-die ECC only exists in SLC
//check device ID byte 4
     if ((ID.byte4 & 0x02) == 0x02) {// internal ECC level ==10b
	if (ID.byte4 & 0x80) {//on-Die ECC enabled
                    if (ONFI.byte112 == 4)
		 60s SLC NAND with on-die ECC
	    else if (ONFI.byte112 == 8)
     	              70s SLC NAND with on-die ECC
	    else
                          Doesn't support on-die ECC
	}	
	else
	  On-die ECC not enabled
     }
   else 
        Doesn't support on-die ECC
}
else
   Doesn't support on-die ECC.

//beanhuo