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| Beide Seiten der vorigen RevisionVorhergehende ÜberarbeitungNächste Überarbeitung | Vorhergehende Überarbeitung | ||
| software:linux:realtime:preempt_rt:build_kernel [2019-02-15 10:31] – mgehrig2 | software:linux:realtime:preempt_rt:build_kernel [2023-04-11 10:56] (aktuell) – gelöscht Urs Graf | ||
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| - | ====== Building a preemt-rt kernel ====== | ||
| - | ===== Introduction ===== | ||
| - | The kernel can be easily installed on a running system. During the boot process, the kernel is started with the latest version number by default. If you want to return to an old version, you can select the desired kernel version in the grub menu " | ||
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| - | ===== Preparation ===== | ||
| - | ==== Installing the toolchain ==== | ||
| - | < | ||
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| - | ==== Get the preemt-rt patch ==== | ||
| - | Check [[https:// | ||
| - | If not, choose the next newer version and download the patch. | ||
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| - | For example:\\ | ||
| - | If you are running a 4.4.165 kernel choose the following patch:\\ | ||
| - | [[https:// | ||
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| - | If you want to use a kernel version that is not already installed, please install the generic kernel with the correct version with [[software: | ||
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| - | ==== Get the Linux sources ==== | ||
| - | * Clone the kernel < | ||
| - | * Check out the same version as chosen for the patch < | ||
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| - | ==== Install the compatible generic kernel ==== | ||
| - | For RT-patch v4.4.148-rt166-rc1 install generic kernel 4.4.0 | ||
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| - | [[software: | ||
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| - | ===== Build the kernel ===== | ||
| - | ==== Patch the kernel sources ==== | ||
| - | * Go into the kernel source directory | ||
| - | * Apply the patch< | ||
| - | patch -p1 < < | ||
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| - | ==== Choose the build variant ==== | ||
| - | This selection will affect, how many modules will be built. | ||
| - | The sizef and the range of functions of the monolitic kernel will not be changed. | ||
| - | Additional modules can be built and installed after the kernel is installed. | ||
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| - | * **a.) Full module support** **(The easy way)** A normal Linux distribution, | ||
| - | * **b.) Minimal**: **(The propper way)** This will only build modules which are essential. Some basic functionality, | ||
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| - | ==== Configure the kernel ==== | ||
| - | === a.) Full module support === | ||
| - | - Copy the kernel configuration from the generic kernel. | ||
| - | * Make sure you copy the correct config-file with the correct version (i.e. '' | ||
| - | cp / | ||
| - | - Applay the configuration to the patched kernel sources.< | ||
| - | * This will apply the configuration. However, since the kernel is patched and not identical to the generic kernel, not all configurations are defined. Acccept all presented options with '' | ||
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| - | === b.) Minimal === | ||
| - | You have three different options: | ||
| - | * **a.)** Configure the kernel to add only the bare minimum. Add all additional modules manually. | ||
| - | * **b.)** Configure the kernel to add all modules, which are currently loaded on the host pc. | ||
| - | * **c.)** Configure the kernel to add all modules, which are currently loaded on a different pc. | ||
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| - | |||
| - | - < | ||
| - | - Depending on the CPU architecture: | ||
| - | - X86 - 64bit < | ||
| - | - X86 - 32bit '' | ||
| - | - See ''< | ||
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| - | === Additional configurations === | ||
| - | - Open the configuration menu < | ||
| - | - Enable the fully preemptible kernel (The path may be different depending on the kernel version) | ||
| - | * Processor type and features ---> Preemption | ||
| - | * or | ||
| - | * Kernel options | ||
| - | - Deactivate expert mode | ||
| - | - General setup ---> **[ ] Configure standard kernel features (expert users)** | ||
| - | - Save the configuration and exit the menu | ||
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| - | ==== Make and install the kernel ==== | ||
| - | This will going to take about an hour. | ||
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| - | - Compile kernel < | ||
| - | - Compile modules < | ||
| - | - Install kernel modules < | ||
| - | - Install kernel < | ||
| - | - Reboot | ||
| - | - Check with '' | ||
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