linux-kernel - Re: [PATCH v2 1/5] ARM: dts: sun8i: Add SID node

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Message-ID: <CAGb2v67aS+2vM8CLB=4ynFOvb14t+kiWjJvAa60U2nq22S8ZEw@mail.gmail.com>
Date:	Tue, 24 Nov 2015 14:42:26 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Chen-Yu Tsai <wens@...e.org>, Josef Gajdusek <atx@....name>,
	linux-sunxi <linux-sunxi@...glegroups.com>,
	linux-clk <linux-clk@...r.kernel.org>, linux-pm@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	devicetree <devicetree@...r.kernel.org>, gpatchesrdh@...as.com,
	Mike Turquette <mturquette@...aro.org>,
	Hans De Goede <hdegoede@...hat.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Michael Turquette <mturquette@...libre.com>,
	Emilio Lopez <emilio@...pez.com.ar>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Eduardo Valentin <edubezval@...il.com>,
	Zhang Rui <rui.zhang@...el.com>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v2 1/5] ARM: dts: sun8i: Add SID node

On Tue, Nov 24, 2015 at 2:38 PM, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> On Tue, Nov 24, 2015 at 11:13:13AM +0800, Chen-Yu Tsai wrote:
>> Hi,
>>
>> On Mon, Nov 23, 2015 at 8:43 PM, Maxime Ripard
>> <maxime.ripard@...e-electrons.com> wrote:
>> > Hi,
>> >
>> > On Mon, Nov 23, 2015 at 09:02:48AM +0100, Josef Gajdusek wrote:
>> >> Add a node describing the Security ID memory to the
>> >> Allwinner H3 .dtsi file.
>> >>
>> >> Signed-off-by: Josef Gajdusek <atx@....name>
>> >> ---
>> >>  arch/arm/boot/dts/sun8i-h3.dtsi | 7 +++++++
>> >>  1 file changed, 7 insertions(+)
>> >>
>> >> diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi b/arch/arm/boot/dts/sun8i-h3.dtsi
>> >> index 0faa38a..58de718 100644
>> >> --- a/arch/arm/boot/dts/sun8i-h3.dtsi
>> >> +++ b/arch/arm/boot/dts/sun8i-h3.dtsi
>> >> @@ -359,6 +359,13 @@
>> >>                       #size-cells = <0>;
>> >>               };
>> >>
>> >> +             sid: eeprom@...14000 {
>> >> +                     compatible = "allwinner,sun4i-a10-sid";
>> >> +                     reg = <0x01c14000 0x400>;
>> >
>> > The datasheet says it's 256 bytes wide, while the size here is of 1kB,
>> > is it intentional?
>>
>> My H3 datasheet (v1.1) says its 1 kB wide.
>
> Is it? in the Security ID section, it is said to be 2kb == 256B wide.

Right. I was looking at the memory map. Maybe it's sparsely mapped?
I guess we'll know soon.

ChenYu

>> It'd be nice if Allwinner actually listed the "usable" E-fuse
>> offsets and widths, instead of having us dig through the SDK code.
>
> Yep.
>
> Thanks!
> Maxime
>
> --
> Maxime Ripard, Free Electrons
> Embedded Linux, Kernel and Android engineering
> http://free-electrons.com
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