linux-kernel - Re: Fwd: Re: [PATCH 2/2] ARM: mvebu: dts: Add dts file for DLink DNS-327L

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Message-ID: <552A6209.9040903@gmail.com>
Date:	Sun, 12 Apr 2015 14:16:09 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Andrew <andrew@...mnt.org>, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	Wolfram Sang <wsa@...-dreams.de>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Jason Cooper <jason@...edaemon.net>
Subject: Re: Fwd: Re: [PATCH 2/2] ARM: mvebu: dts: Add dts file for DLink
 DNS-327L

On 12.04.2015 13:43, Andrew wrote:
> Sebastian Hesselbarth писал 12.04.2015 14:20:
>> On 11.04.2015 22:29, Andrew Andrianov wrote:
>>> Signed-off-by: Andrew Andrianov <andrew@...mnt.org>
[...]
>>> + * CONFIG_ARM_MVEBU_V7_CPUIDLE=y causes hard freezes every 1-8 hours
>>
>> I don't think the dts is the right place for Linux issues.
>
> Not sure if that's a hardware weirdness or software issue (yet).
> Just checked - this goblin is there in 4.0-rc7.

I understand the issue, but still the dts is not the right place
for this comment.

[...]
>>> +                marvell,nand-keep-config;
>>> +                marvell,nand-enable-arbiter;
>>> +                nand-on-flash-bbt;
>>
>> Do you know the ECC scheme used?
>
> Any hints on how to find it apart from dumping NAND controller registers
> from bootloader ?

 From the original bootlog:

armada-nand armada-nand.0: Initialize HAL based NFC in 8bit mode with 
DMA Disabled using BCH 4bit ECC

that translates into

nand-ecc-strength = <4>;
nand-ecc-step-size = <512>;

[...]
>>> +                /* Hardwired into stock bootloader */
>>
>> I don't get the comment above.
>
> The stock u-boot is hacked with a 'failsafe' kernel address.

Ok, the above partition isn't passed by the bootloader on mtdparts
cmdline, i.e. that is why you call it "hardwired" ?

Just remove the comment, actually the whole partition table is
"hacked" into the stock bootloader.

> If for some reason running the 'bootcmd' fails, it reads
> 5MiBs from partition @ (5d00000 + 0x800) and tries to boot it.
> There's no way to change this via environment, only by replacing
> the bootloader.
> Personally I'm more happy with a simpler partition table, but I
> guess upstream should be oriented towards the stock bootloader.

Yeah, leave the original partition table. Any other, smarter
bootloader can replace it.

[...]
> Thanks for the review, I'll resubmit the fixed patchset shortly.
> Please disregard my [PATCH v2] messages. I've send them the moment before
> I noticed your email and review.

Please always leave the Cc-list in place.

And you should relax and leave patches there a day or two (or three).
Not everybody is reading patches immediately.

We are in no hurry, the current merge window is already closed,
the new one is 6 weeks away.

Sebastian
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