[PATCH v1 16/19] arm: dts: mt7623: fixup available memory size on bananapi-r2

[Rob Herring]

On Fri, Mar 2, 2018 at 5:27 PM, Sean Wang <sean.wang at mediatek.com> wrote:
> On Fri, 2018-03-02 at 09:42 -0600, Rob Herring wrote:
>> On Fri, Feb 23, 2018 at 06:16:36PM +0800, sean.wang at mediatek.com wrote:
>> > From: Sean Wang <sean.wang at mediatek.com>
>> >
>> > There is 2GB DDR3 available on bananapi-r2 board as [1] specified.
>> >
>> > [1] http://www.banana-pi.org/r2.html
>> >
>> > Signed-off-by: Sean Wang <sean.wang at mediatek.com>
>> > ---
>> >  arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts | 5 +++++
>> >  1 file changed, 5 insertions(+)
>> >
>> > diff --git a/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts b/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts
>> > index 140ff78..3e8d02c 100644
>> > --- a/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts
>> > +++ b/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts
>> > @@ -38,6 +38,11 @@
>> >                     default-state = "off";
>> >             };
>> >     };
>> > +
>> > +   memory {
>>
>> Unit address?
>>
>
> If I did it with adding unit address
>
> -       memory {
> +       memory at 80000000 {
>                 device_type = "memory";
>                 reg = <0 0x80000000 0 0x80000000>;
>         };
>
>
> bad dtc blob is being generated and contains two memory nodes, one is
> memory and the other is memory at 80000000 whose blob disassembly detail is
> as the following.
>
>       memory {
>                 device_type = "memory";
>                 reg = <0x0 0x0 0x0 0x0>;
>         };
>
>
>
>       memory at 80000000 {
>                 device_type = "memory";
>                 reg = <0x0 0x80000000 0x0 0x80000000>;
>         };
>
>
> and bad memory node with size 0 would cause the boot fails.
>
>
> is it a dtc compiler problem ?

No, you are declaring "memory" node somewhere else. Perhaps using
skeleton.dtsi which we are trying to remove or you have some default.

Using just 'memory' is fine if the base address is variable and
determined at boot time or you have a bootloader that expects just
'memory'. Otherwise, this should be fixed, but you can do that after
this patch if you want.

Rob