[PATCH v2] mtd: nand: support BENAND (Built-in ECC NAND)

[Gupta, Pekon]

Hi,

> This enables support for BENAND, which is an SLC NAND flash solution
> with embedded error correction code (ECC), currently supports only
> 128bytes OOB type.
> 
> In the read sequence, "status read command" is executed to check the
> ECC status after read data. If bitflips occur, these are
> automatically corrected by BENAND and the status indicates the result.
> 
> The write sequence is the same as raw write and the ECC data are
> automatically written to OOB by BENAND.

Just inquisitive, can anyone please share any throughput comparison between 'BENAND' & 'normal NAND' devices having same capacity and working on same clock-freq ?

(a) Usually on-chip memory controllers work on faster clock frequencies, as compared to the NAND devices connected to them externally on board.
Thus I assume, ECC computation & correction can be done at faster rate.

(b) However, on other hand BENAND(s) have luxury of accessing the Flash storage array locally, thus eliminating I/O delays | un-optimized IO signal timing from the access-path.

So, if you can share the details throughput comparison between the two types of NAND devices, under various conditions it would be helpful.


with regards, pekon