linux-kernel - enhance ONFI table reliability/stable

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Message-ID: <A765B125120D1346A63912DDE6D8B6310BF37D1C@NTXXIAMBX02.xacn.micron.com>
Date:	Tue, 21 Jul 2015 14:42:34 +0000
From:	Bean Huo 霍斌斌 (beanhuo) 
	<beanhuo@...ron.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>
Subject: enhance ONFI table reliability/stable

Hi, 

Recently, I faced some case about ONFI table reliability, now it used CRC.
If there is bit flips in ONFI parameter pages, parameter backup page will be taken. 
For latest linux,default read three copys.

	chip->cmdfunc(mtd, NAND_CMD_PARAM, 0, -1);
	for (i = 0; i < 3; i++) {
		for (j = 0; j < sizeof(*p); j++)
			((uint8_t *)p)[j] = chip->read_byte(mtd);
		if (onfi_crc16(ONFI_CRC_BASE, (uint8_t *)p, 254) ==
				le16_to_cpu(p->crc)) {
			break;
		}
	}

However ,with technoogy improvement,for TLC and new generatin MLC,I think, three copys of 
Parameter tables is not powerful enough.my question is that if there is a good method to protect and corrent parameter page. For example,we can use linux software BCH ecc.
Any suggections and input be welcomed,if you having any concerns about this,don't free tell me.
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