The Khadas VIM4 features 8GB of LPDDR4X RAM. The previous memory node
mapped a single incorrect region. This caused the kernel to map MMIO
and secure firmware (ATF/TrustZone) memory holes as standard RAM,
leading to an Asynchronous SError Interrupt during early boot
(paging_init) when the kernel attempted to clear those pages.

Fix this by splitting the 8GB memory layout into three separate
regions to properly avoid the memory holes (e.g., 0xe0000000 -
0xffffffff):
- 3.5GB @ 0x000000000
- 3.5GB @ 0x100000000
- 1.0GB @ 0x200000000

Signed-off-by: Nick Xie <nick@khadas.com>
---
 arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts b/arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts
index 25b478e106451..106eab2b4c2e2 100644
--- a/arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts
+++ b/arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts
@@ -17,7 +17,9 @@ aliases {
 
 	memory@0 {
 		device_type = "memory";
-		reg = <0x0 0x0 0x2 0x0>; /* 8 GB */
+		reg = <0x00000000 0x00000000 0x00000000 0xE0000000
+			0x00000001 0x00000000 0x00000000 0xE0000000
+			0x00000002 0x00000000 0x00000000 0x40000000>;
 	};
 
 	reserved-memory {
-- 
2.34.1

On 3/6/26 4:10 AM, Nick Xie wrote:
> The Khadas VIM4 features 8GB of LPDDR4X RAM. The previous memory node
> mapped a single incorrect region. This caused the kernel to map MMIO
> and secure firmware (ATF/TrustZone) memory holes as standard RAM,
> leading to an Asynchronous SError Interrupt during early boot
> (paging_init) when the kernel attempted to clear those pages.
> 
> Fix this by splitting the 8GB memory layout into three separate
> regions to properly avoid the memory holes (e.g., 0xe0000000 -
> 0xffffffff):
> - 3.5GB @ 0x000000000
> - 3.5GB @ 0x100000000
> - 1.0GB @ 0x200000000
> 
> Signed-off-by: Nick Xie <nick@khadas.com>
> ---
>  arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts b/arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts
> index 25b478e106451..106eab2b4c2e2 100644
> --- a/arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts
> +++ b/arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts
> @@ -17,7 +17,9 @@ aliases {
>  
>  	memory@0 {
>  		device_type = "memory";
> -		reg = <0x0 0x0 0x2 0x0>; /* 8 GB */
> +		reg = <0x00000000 0x00000000 0x00000000 0xE0000000
> +			0x00000001 0x00000000 0x00000000 0xE0000000
> +			0x00000002 0x00000000 0x00000000 0x40000000>;
>  	};
>  

I suggest to remove the leading zeroes here.

>  	reserved-memory {