linux-kernel - Re: [PATCH 00/15] atmel_mxt_ts - device tree, bootloader, etc

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Date:	Tue, 29 Jul 2014 17:43:41 +0100
From:	Nick Dyer <nick.dyer@...ev.co.uk>
To:	Yufeng Shen <miletus@...omium.org>,
	Stephen Warren <swarren@...dotorg.org>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	benson Leung <bleung@...omium.org>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Henrik Rydberg <rydberg@...omail.se>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Alan Bowens <Alan.Bowens@...el.com>,
	linux-input <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Meerwald <pmeerw@...erw.net>,
	Olof Johansson <olofj@...omium.org>,
	Sekhar Nori <nsekhar@...com>
Subject: Re: [PATCH 00/15] atmel_mxt_ts - device tree, bootloader, etc

On 29/07/14 01:10, Yufeng Shen wrote:
> T37 (0x25) is DEBUG_DIAGNOSTIC object which the host can read debugging info
> from. It is not useful to have a initial config for it so usually CrOS
> system would just
> don't include configuration for this object.
> 
> Nick, I want to confirm with you that does T37 contribute to config
> checksum computation?

You are correct.

>> At this point, mxt-save-after-loading-224sl.raw.xml contains identical
>> content to mxt-save-after-t9-83-write.xml (my previous backup). It looks
>> like the new configuration isn't being loaded correctly, or perhaps
>> configuration loading doesn't delete entries that are simply not in the new
>> configuration file?
> 
> Yeah, I would guess since T37 is not in the config, so whatever in the NVRAM
> stays the same and when you --save its original value gets dumped.

Yes. You need to call --zero to get a truly blank config, before loading.
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