From: Nick Xie <nick@khadas.com>
To: neil.armstrong@linaro.org, khilman@baylibre.com,
martin.blumenstingl@googlemail.com, jbrunet@baylibre.com
Cc: krzk+dt@kernel.org, robh@kernel.org, conor+dt@kernel.org,
linux-amlogic@lists.infradead.org,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, Nick Xie <nick@khadas.com>,
Ronald Claveau <linux-kernel-dev@aliel.fr>
Subject: [PATCH v2] arm64: dts: amlogic: t7: khadas-vim4: fix memory layout for 8GB RAM
Date: Thu, 19 Mar 2026 10:34:46 +0800 [thread overview]
Message-ID: <20260319023446.3422695-1-nick@khadas.com> (raw)
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>
Suggested-by: Ronald Claveau <linux-kernel-dev@aliel.fr>
---
Changes in v2:
- Removed leading zeroes in the memory node reg property.
Link to v1: https://lore.kernel.org/all/20260306031014.2421875-1-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..f4c953034be39 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 = <0x0 0x0 0x0 0xE0000000
+ 0x1 0x0 0x0 0xE0000000
+ 0x2 0x0 0x0 0x40000000>; /* 8 GB */
};
reserved-memory {
--
2.34.1
next reply other threads:[~2026-03-19 2:35 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-19 2:34 Nick Xie [this message]
2026-03-26 9:02 ` [PATCH v2] arm64: dts: amlogic: t7: khadas-vim4: fix memory layout for 8GB RAM Neil Armstrong
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