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Merge pull request #2389 from bgilbert/kernel-readme

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sys-kernel: Update README for current implementation
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Benjamin Gilbert 2017-01-25 15:25:59 -08:00 committed by GitHub
commit 1cd11cfb65
1 changed files with 18 additions and 12 deletions
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30
sdk_container/src/third_party/coreos-overlay/sys-kernel/README vendored
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@ -1,11 +1,11 @@
The kernel is provided in two parts: coreos-sources and coreos-kernel.
The kernel is provided in three parts: coreos-sources, coreos-modules,
and coreos-kernel.
coreos-sources is a traditional Gentoo kernel source ebuild, which
installs to ${ROOT}/usr/src/linux-${PV}. No extra revision or name is
added since, like the upstream vanilla-sources, we don't ship patches.
installs to ${ROOT}/usr/src/linux-${PV}-coreos${COREOS_SOURCE_REVISION}.
coreos-kernel uses the installed sources to build a kernel image and all
modules. The kernel config is searched for in the files directory based
coreos-modules uses the installed sources to build the kernel modules.
The kernel config is searched for in the files directory based
on the ebuild version and revision. For example version 3.12.4-r2:
- amd64_defconfig-3.12.4-r2
- amd64_defconfig-3.12.4
@ -19,13 +19,19 @@ for using the same rules - for example:
- commonconfig-3.12
- commonconfig
Currently our dracut based initrd (bootengine) gets built directly into
the kernel image, including all kernel modules. (go go modular kernels!)
This reason for this screwy scheme never came to pass and should be
fixed eventually. The current grub bootloader already includes logic for
initrds but the old configure_bootloaders and coreos-postinst scripts
need to be updated in order to support existing installs.
coreos-kernel uses the installed sources and coreos-modules to build the
kernel image and initramfs. Many of its build dependencies are copied into
the initramfs by dracut, and several of these are significant enough that we
want to rebuild coreos-kernel whenever they change. Such packages set their
sub-slot to their ${PVR}, and then coreos-kernel DEPENDs on them using a
slot operator (":=") to force a rebuild whenever their sub-slot changes.
Currently our dracut based initramfs (bootengine) gets built directly into
the kernel image. The reason for this screwy scheme never came to pass and
should be fixed eventually. The current grub bootloader already includes
logic for initrds but the old configure_bootloaders and coreos-postinst
scripts need to be updated in order to support existing installs.
The coreos-firmware package is a magic version of the upstream
linux-firmware ebuild which scans the modules installed by coreos-kernel
linux-firmware ebuild which scans the modules installed by coreos-modules
and only installs files modules declare as required.