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OE/Yocto has a feature called SSTATE(shared state) to deliver prebuilts amongst users. Shared state is currently configured with OE/Yocto projects. Prebuilds are handled internally by Yocto by using sstate-cache. If a prebuilt from a known good build is available, the build can point to that folder via the conf file inside the ./build<buildtype>/conf/ folder so that the prebuilts are picked up from the location |
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This depend entirely on multiple factors like capacity of build machine, first time build or repeated build in the same work space as well as changes in components on which the component in question depends on( if there is a change, the depending component is first built and then the dependent component ) and hence cannot be answered directly. |
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When you checkout sandbox every component is independently buildable, and bitbake ( OE's build engine) is responsible to identify and sort the component dependency chain and ensure its built along. if you were to build a single component the commands are bitbake <component> where component is in one to one relation with .bb ( recipe ) file that can be found in the Yocto/OE metadata ( meta-rdk* layers ) e.g. if you were to build rdkbrowser then you would see that its recipe is housed in generic layer called meta-rdk-cmf and recipe is called rdkbrowser.bb so you would do bitbake rdkbrowser However this will only generate CMF component and for packaging it up into final image you still will have to build the image component to repackage rdkbrowser bitbake rdk-generic-hybrid-wpe-image would generate the CMF generic image for hybrid devices. it will only rebuild the affected components when building the image if nothing has changed it will not recreate the image. |
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