linux-kernel - Re: [PATCH v2 3/8] mtd: get the ECC info from the Extended Parameter Page

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Message-ID: <5176271C.7030304@freescale.com>
Date:	Tue, 23 Apr 2013 14:15:56 +0800
From:	Huang Shijie <b32955@...escale.com>
To:	Brian Norris <computersforpeace@...il.com>
CC:	<dwmw2@...radead.org>, <dedekind1@...il.com>,
	<linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/8] mtd: get the ECC info from the Extended Parameter
 Page

于 2013年04月23日 05:22, Brian Norris 写道:
> You never sent a command to the chip. How can you expect to read from it?
>
> It seems that you are writing this function with the assumption of a
> particular calling context (a context in which the last command was
> CMD_PARAM). IMO, it would make a lot more sense that this function
> actually send its own CMD_PARAM followed by either X bytes of skipped
> read_buf() or a change read column command. Then it doesn't need the
> "last" argument, and its usage makes much more sense.
>
I finally find why i can not use the CHANGE READ COLUMN command:

When we detect the ONFI nand, we actually use the nand_command() to 
issue the command which
does not works with CHANGE READ COLUMN command.

I use the nand_command_lp() to issue the CHANGE READ COLUMN command, it 
works fine.

I can remove the "last" argument now.

thanks Brian.

Huang Shijie

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