[PATCH v4 6/7] arm64: dts: allwinner: a100: reserve RAM for ATF

[Alexander Sverdlin]

Hi Jernej,

On Sat, 2026-06-13 at 10:22 +0200, Jernej Škrabec wrote:
> Dne petek, 5. junij 2026 ob 09:09:20 Srednjeevropski poletni čas je Alexander Sverdlin napisal(a):
> > Add reserved-memory node carving out Trusted Firmware-A region spanning
> > fixed 256K from physical address 0x40000000. Even though Allwinner ATF
> > itself passes the address range in the fdt to U-Boot, U-Boot currently
> > only reserves this memory internally, but doesn't carve out the region
> > in the fdt passed to Linux.
> > 
> > Signed-off-by: Alexander Sverdlin <alexander.sverdlin at gmail.com>
> 
> NAK. It is job of boot procedure to properly inject TF-A reserved node.
> Any issue should be fixed there.


like in commit 0d17c865118881609ea7e381c7cadbb7979cc596
("arm64: dts: allwinner: Add Allwinner H616 .dtsi file")
    Signed-off-by: Jernej Skrabec <jernej.skrabec at gmail.com>

? ;-)

> Best regards,
> Jernej Skrabec
> 
> > ---
> > Changelog:
> > v4:
> > - new patch
> > 
> >   arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi | 16 ++++++++++++++++
> >   1 file changed, 16 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> > index 7cb06b19b5a5..d8391663fd1d 100644
> > --- a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> > @@ -87,6 +87,22 @@ osc32k: osc32k-clk {
> >   		#clock-cells = <0>;
> >   	};
> >   
> > +	reserved-memory {
> > +		#address-cells = <2>;
> > +		#size-cells = <2>;
> > +		ranges;
> > +
> > +		/*
> > +		 * 256 KiB reserved for Trusted Firmware-A (BL31).
> > +		 * This is added by BL31 itself, but some bootloaders fail
> > +		 * to propagate this into the DTB handed to kernels.
> > +		 */
> > +		secmon at 40000000 {
> > +			reg = <0x0 0x40000000 0x0 0x40000>;
> > +			no-map;
> > +		};
> > +	};
> > +
> >   	timer {
> >   		compatible = "arm,armv8-timer";
> >   		interrupts = <GIC_PPI 13

-- 
Alexander Sverdlin.