Subject: Re: [PATCH] arm64: dts: hisilicon: hi3798cv200: Add missing dma-ranges

From: Wei Xu <[email-masked]>
Date: Sat, 21 Mar 2026 14:52:08 +0800

Hi Shawn,

On 2026/2/27 15:22, Shawn Guo wrote:
> Reboot starts failing on Poplar since commit 8424ecdde7df ("arm64: mm:
> Set ZONE_DMA size based on devicetree's dma-ranges"), which effectively
> changes zone_dma_bits from 30 to 32 for arm64 platforms that do not
> properly define dma-ranges in device tree.  It's unclear how Poplar reboot
> gets broken by this change exactly, but a dma-ranges limiting zone_dma to
> the first 1 GB fixes the regression.
> 
> Fixes: 2f20182ed670 ("arm64: dts: hisilicon: add dts files for hi3798cv200-poplar board")
> Cc: [email-masked]
> Signed-off-by: Shawn Guo <[email-masked]>
> ---
>  arch/arm64/boot/dts/hisilicon/hi3798cv200.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/hisilicon/hi3798cv200.dtsi b/arch/arm64/boot/dts/hisilicon/hi3798cv200.dtsi
> index f6bc001c3832..2f4ad5da5e33 100644
> --- a/arch/arm64/boot/dts/hisilicon/hi3798cv200.dtsi
> +++ b/arch/arm64/boot/dts/hisilicon/hi3798cv200.dtsi
> @@ -122,6 +122,7 @@ soc: soc@f0000000 {
>  		#address-cells = <1>;
>  		#size-cells = <1>;
>  		ranges = <0x0 0x0 0xf0000000 0x10000000>;
> +		dma-ranges = <0x0 0x0 0x0 0x40000000>;
>  
>  		crg: clock-reset-controller@8a22000 {
>  			compatible = "hisilicon,hi3798cv200-crg", "syscon", "simple-mfd";
> 

Applied to the HiSilicon arm64 dt tree.
Thanks!

Best Regards,
Wei