Re: [PATCH] arm64: dts: qcom: kodiak: avoid EFI overlap for ADSP remote heap

[Konrad Dybcio]

On 4/23/26 8:35 AM, Jianping Li wrote:
> On KODIAK platforms boot can fail when the DT "adsp-rpc-remote-heap"
> reserved-memory region overlaps with firmware allocations (UEFI/EFI
> runtime). The kernel then reports failure to reserve the region and
> subsequent EFI runtime activity may trigger aborts.
> 
> The remote heap node was described as a fixed "no-map" region, which
> turns it into a hard carveout. Replace it with a "shared-dma-pool"
> reserved memory region with reusable CMA-backed allocation, specifying
> alignment and size.
> 
> This avoids hard carveouts and reduces the chance of conflicting with
> firmware memory maps while keeping an explicit pool for ADSP remote
> heap usage.
> 
> Fixes: 90a58ffa9c55 ("arm64: dts: qcom: kodiak: Add memory region for audiopd")
> Cc: stable@xxxxxxxxxx
> Signed-off-by: Jianping Li <jianping.li@xxxxxxxxxxxxxxxx>
> ---
>  arch/arm64/boot/dts/qcom/kodiak.dtsi | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/kodiak.dtsi b/arch/arm64/boot/dts/qcom/kodiak.dtsi
> index 988ca5f7c8a0..420219823496 100644
> --- a/arch/arm64/boot/dts/qcom/kodiak.dtsi
> +++ b/arch/arm64/boot/dts/qcom/kodiak.dtsi
> @@ -191,9 +191,12 @@ rmtfs_mem: rmtfs@9c900000 {
>  			qcom,vmid = <QCOM_SCM_VMID_MSS_MSA>;
>  		};
>  
> -		adsp_rpc_remote_heap_mem: adsp-rpc-remote-heap@9cb80000 {
> -			reg = <0x0 0x9cb80000 0x0 0x800000>;
> -			no-map;
> +		adsp_rpc_remote_heap_mem: adsp-rpc-remote-heap {
> +			compatible = "shared-dma-pool";
> +			alloc-ranges = <0x0 0x00000000 0x0 0xffffffff>;

Since DRAM starts at 0x8000_0000, is it intended to only allow this
region to be in the lower 2 gigs?

(it may very well be for some historical reasons)

Konrad