Astra 开发套件的内存布定制
Astra RDK uses DRAM for several components in the SoC. The DRAM is divided up into several sections depending on what it is used for. These sections include System memory, NonSecure (CMA), NonSecure (non-cached), and Secure memory. System memory is the memory available to the Linux kernel. Included in System memory is the NonSecure section which is used by the kernel for CMA. Secure memory is reserved for when the SoC is operating secure environments such as TrustZone, and is not accessible to Linux. The NonSecure (non-cached) section is reserved for SoC components which require non-cached memory.
内存布局
Astra RDK supports predefined memory layouts for various DDR configurations. The default configuration can be changed based on the amount of DDR in the system.
备注
Modifying the size of the memory sections requires Synaptics to resign the preboot firmware and are not user modifiable.
芯片
缺省内存
可支持内存
SL1620
2GB
1GB / 2GB / 4GB
SL1640
2GB
2GB / 4GB
SL1680
4GB
2GB / 4GB
Below are the memory layouts for all available DDR sizes.
SL1620 内存布局
内存大小
内存区域
大小
1 GB DDR
NonSecure (CMA)
System
NonSecure (Non-cached)
Secure
64MB
930MB
4MB
16MB
2 GB DDR
NonSecure (CMA)
System
NonSecure (Non-cached)
Secure
512MB
1.950GB
8MB
16MB
4 GB DDR
NonSecure (CMA)
System
NonSecure (Non-cached)
Secure
64MB
3.482GB
8MB
16MB
SL1640 内存布局
内存大小
内存区域
大小
2 GB DDR
NonSecure (CMA)
System
NonSecure (Non-cached)
Secure
260MB
1.948GB
8MB
16MB
4 GB DDR
NonSecure (CMA)
System
NonSecure (Non-cached)
Secure
500MB
3.482GB
8MB
16MB
SL1680 内存布局
内存大小
内存区域
大小
2 GB DDR
NonSecure (CMA)
System
NonSecure (Non-cached)
Secure
260MB
1.948GB
8MB
16MB
4 GB DDR
NonSecure (CMA)
System
NonSecure (Non-cached)
Secure
500MB
3.482GB
8MB
16MB
更改内存布局
The memory layout is set in the configuration file included in the
synasdk-config-native package. Use the devtool utility to modify the config file:
devtool modify synasdk-config-native
The devtool utility will create the
build-sl1680/workspace/sources/synasdk-config-native/configs/product
directory which will contain the source for the config package.
This directory will contain a subdirectory containing a config file for each of the platforms.
Edit the config file for the platform which you are building for.
Set the CONFIG_TZK_MEM_LAYOUT parameter to the layout which matches the about of DDR
on your board. The supported memory layouts are listed below in the
CONFIG_TZK_SUPPORTED_MEM_LAYOUT parameter.
For example, to change the memory layout for SL1620,
edit sl1620_poky_aarch64_rdk/sl1620_poky_aarch64_rdk_defconfig .
配置 sl1620 内存布局
For SL1640 sl1640_poky_aarch64_rdk/sl1640_poky_aarch64_rdk_defconfig
and SL1680 sl1680_poky_aarch64_rdk/sl1680_poky_aarch64_rdk_defconfig .
配置 sl1680 内存布局
Finally, build an image with the modified memory layout:
devtool build synasdk-config-native
devtool build-image astra-media