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software:linux:yocto:sdk [2020-10-21 09:12] – Urs Grafsoftware:linux:yocto:sdk [2023-11-16 16:16] (aktuell) – Urs Graf
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-====== SDK's ====== +====== SDK ======
- +
-===== Build Natively ===== +
- +
-This is the simplest but also least useful way to build packages for yocto. +
-By default, there is no toolchain installed in the image. +
- +
-To add the toolchain to an image, append ''tools-sdk'' to ''CORE_IMAGE_INSTALL''. +
- +
-<code> +
-CORE_IMAGE_INSTALL_append  = " tools-sdk" +
-</code> +
- +
-Note that this will significantly increase image size and build time.+
  
 ===== Cross Development SDK ===== ===== Cross Development SDK =====
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 <code> <code>
-bitbake <image name> -c poulate_sdk+bitbake <image name> -c populate_sdk
 # for example: # for example:
-bitbake ntb-prod-image -c pouplate_sdk+bitbake ost-image -c populate_sdk
 </code> </code>
  
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 By default the SDK is in ''build/tmp/deploy/sdk/''. By default the SDK is in ''build/tmp/deploy/sdk/''.
  
-==== Installing the SDK ====+=== Changing the SDK HOST CPU Architecture ===
  
-Buildig the SDK will generate a few files. The most important one being a ''.sh'' script that is used to isntall the SDK.+By default, the SDK is built for ''x86_64'' host machines. That means you can use the SDK on x86_64 computers to build software for the target. If you want to use the SDK on another system such as the ARM based Apple Macbooks, the SDK host architecture needs to be specified accordingly. This is achieved through the ''SDKMACHINE'' variable. 
 +To build the SDK for a 64bit ARM host (e.g. ARM based Apple computers), add the following to ''local.conf'': 
 +<code> 
 +SDKMACHINE = "aarch64" 
 +</code> 
 + 
 +==== Installing the SDK ==== 
 +The sdk can be built as described above or can be fetched from [[software:linux:images:start|Linux Images]]. It does do not need to be extracted any further. Building the SDK will generate a few files. The most important one being a ''.sh'' script that is used to install the SDK.
 For example, building the SDK yields: For example, building the SDK yields:
  
 <code> <code>
-poky-glibc-x86_64-ntb-dev-image-armv7at2hf-neon-bblue-toolchain-3.0.2.host.manifest +poky-glibc-x86_64-ost-image-dev-armv7at2hf-neon-bblue-toolchain-3.0.2.host.manifest 
-poky-glibc-x86_64-ntb-dev-image-armv7at2hf-neon-bblue-toolchain-3.0.2.sh +poky-glibc-x86_64-ost-image-dev-armv7at2hf-neon-bblue-toolchain-3.0.2.sh 
-poky-glibc-x86_64-ntb-dev-image-armv7at2hf-neon-bblue-toolchain-3.0.2.target.manifest +poky-glibc-x86_64-ost-image-dev-armv7at2hf-neon-bblue-toolchain-3.0.2.target.manifest 
-poky-glibc-x86_64-ntb-dev-image-armv7at2hf-neon-bblue-toolchain-3.0.2.testdata.json+poky-glibc-x86_64-ost-image-dev-armv7at2hf-neon-bblue-toolchain-3.0.2.testdata.json
 </code> </code>
  
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 <code> <code>
-./tmp/deploy/sdk/poky-glibc-x86_64-ntb-dev-image-armv7at2hf-neon-bblue-toolchain-3.0.2.sh+./tmp/deploy/sdk/poky-glibc-x86_64-ost-image-dev-armv7at2hf-neon-bblue-toolchain-3.0.2.sh
 Poky (Yocto Project Reference Distro) SDK installer version 3.0.2 Poky (Yocto Project Reference Distro) SDK installer version 3.0.2
 ================================================================= =================================================================
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 The script needs to be sourced rather than executed. The script needs to be sourced rather than executed.
 Now running any standard build system (eg ''make'') should pick up the cross compile settings and automatically build for the target platform. Now running any standard build system (eg ''make'') should pick up the cross compile settings and automatically build for the target platform.
 +
 +
 +==== Developing Kernel Modules ====
 +
 +When using [[meta-ost]], the SDK contains the kernel dev sources by default.
 +However, properly compiling an out of tree module requires some additional steps:
 +
 +<code>
 +. path/to/sdk/environment-setup-aarch64-linux-<arch>
 +pushd path/to/sdk/sysroot/<arch>/usr/src/kernel
 +make scripts
 +make prepare
 +</code>
 +
 +Source: {{ https://stackoverflow.com/questions/60923890/how-to-build-linux-kernel-module-using-yocto-sdk}}
 +
 +Note that depending on the location of the installed SDK, ''make scripts'' may encounter permission errors.
 +This has been observed when installing the SDK in ''/opt''.
 +The easiest way to work around this is installing the SDK in a location under the current user's home directory.
  
 === Additional Information === === Additional Information ===
  
 [[ https://www.youtube.com/watch?v=u1rzYRz83kc&t=3119s | Live Coding with Yocto Project #4: SDKs ]] [[ https://www.youtube.com/watch?v=u1rzYRz83kc&t=3119s | Live Coding with Yocto Project #4: SDKs ]]

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software/linux/yocto/sdk.1603264346.txt.gz · Zuletzt geändert: 2020-10-21 09:12 von Urs Graf