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

[Jernej Škrabec]

Dne sobota, 13. junij 2026 ob 10:34:42 Srednjeevropski poletni čas je Alexander Sverdlin napisal(a):
> 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>
> 
> ? ;-)

I was against that too.

It's time to be fixed in bootloader.

Best regards,
Jernej

> 
> > 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
> 
>