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Merge pull request #604 from rneugeba/kern-doc

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doc: add a note on building debug kernels
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Justin Cormack 2016-10-11 19:26:01 +01:00 committed by GitHub
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alpine/kernel/README.md
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@ -1,3 +1,24 @@
Temporary non modular kernel config for pinata alpha Temporary non modular kernel config for pinata alpha
TODO: build with Alpine and/or use Alpine kernels - needs some patches. TODO: build with Alpine and/or use Alpine kernels - needs some patches.
The build is mostly silent. To view the output use `docker log -f <containerid>`. The build creates multiple containers, so multiple
invocations may be necessary. To view the full build output one may also invoke `docker build .` and then copy the build artefacts from the image afterwards.
To build with various debug options enabled, build the kernel with
`make DEBUG=1`. The options enabled are listed in `kernel_config.debug`. This allocates a significant amount of memory on boot and you may need to adjust the kernel config on some systems. Specifically:
```diff
--- a/alpine/kernel/kernel_config
+++ b/alpine/kernel/kernel_config
@@ -415,8 +415,8 @@ CONFIG_DMI=y
# CONFIG_CALGARY_IOMMU is not set
CONFIG_SWIOTLB=y
CONFIG_IOMMU_HELPER=y
-CONFIG_MAXSMP=y
-CONFIG_NR_CPUS=8192
+CONFIG_MAXSMP=n
+CONFIG_NR_CPUS=8
# CONFIG_SCHED_SMT is not set
CONFIG_SCHED_MC=y
# CONFIG_PREEMPT_NONE is not set
```