On Fri, Mar 2, 2018 at 5:27 PM, Sean Wang <sean.wang@xxxxxxxxxxxx> 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@xxxxxxxxxxxx wrote: >> > From: Sean Wang <sean.wang@xxxxxxxxxxxx> >> > >> > 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@xxxxxxxxxxxx> >> > --- >> > 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@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@80000000 whose blob disassembly detail is > as the following. > > memory { > device_type = "memory"; > reg = <0x0 0x0 0x0 0x0>; > }; > > > > memory@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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
