diff --git a/edk2-rockchip/Silicon/Rockchip/RK3588/Library/PlatformLib/Rk3588Mem.c b/edk2-rockchip/Silicon/Rockchip/RK3588/Library/PlatformLib/Rk3588Mem.c
index 35eaf322d..aa2ab389c 100644
--- a/edk2-rockchip/Silicon/Rockchip/RK3588/Library/PlatformLib/Rk3588Mem.c
+++ b/edk2-rockchip/Silicon/Rockchip/RK3588/Library/PlatformLib/Rk3588Mem.c
@@ -81,7 +81,7 @@ ArmPlatformGetVirtualMemoryMap (
   // Base System RAM
   VirtualMemoryTable[Index].PhysicalBase    = mSystemMemoryBase;
   VirtualMemoryTable[Index].VirtualBase     = VirtualMemoryTable[Index].PhysicalBase;
-  VirtualMemoryTable[Index].Length          = MIN (mSystemMemorySize, 0xF0000000UL);
+  VirtualMemoryTable[Index].Length          = MIN (mSystemMemorySize, 0xF0000000UL - mSystemMemoryBase);
   VirtualMemoryTable[Index].Attributes      = ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK;
   VirtualMemoryInfo[Index].Type             = RK3588_MEM_BASIC_REGION;
   VirtualMemoryInfo[Index++].Name           = L"System RAM";