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author | Scott Rifenbark <scott.m.rifenbark@intel.com> | 2015-03-02 14:59:09 -0800 |
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committer | Richard Purdie <richard.purdie@linuxfoundation.org> | 2015-03-06 10:44:34 +0000 |
commit | e7e533028bea299ca85b4fc503ccca61c35ae60c (patch) | |
tree | 11e0e8ac9efe27604a25fc417935f61f8a24ea62 /documentation/kernel-dev/kernel-dev-advanced.xml | |
parent | 043e02c5d89b60432d8c790779b6f9493a205985 (diff) | |
download | openembedded-core-contrib-e7e533028bea299ca85b4fc503ccca61c35ae60c.tar.gz |
kernel-dev: Scrubbed out the 3.4 kernel references.
This kernel is not supported and is ancient. Many of the examples
were referencing this kernel. I switched to use the 3.19 version.
Reported-by: Robert P. J. Day <rpjday@crashcourse.ca>
(From yocto-docs rev: ba04c4f11a02b4562994d5d79838cd2cf90efc7e)
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'documentation/kernel-dev/kernel-dev-advanced.xml')
-rw-r--r-- | documentation/kernel-dev/kernel-dev-advanced.xml | 128 |
1 files changed, 67 insertions, 61 deletions
diff --git a/documentation/kernel-dev/kernel-dev-advanced.xml b/documentation/kernel-dev/kernel-dev-advanced.xml index 9b35a422db..c3bda983b2 100644 --- a/documentation/kernel-dev/kernel-dev-advanced.xml +++ b/documentation/kernel-dev/kernel-dev-advanced.xml @@ -145,9 +145,9 @@ </literallayout> The value of the entries in <filename>KERNEL_FEATURES</filename> are dependent on their location within the kernel Metadata itself. - The examples here are taken from the - <filename>linux-yocto-3.4</filename> repository where "features" - and "cfg" are subdirectories within the + The examples here are taken from the <filename>meta</filename> + branch of the <filename>linux-yocto-3.19</filename> repository. + Within that branch, "features" and "cfg" are subdirectories of the <filename>meta/cfg/kernel-cache</filename> directory. For more information, see the "<link linkend='kernel-metadata-syntax'>Kernel Metadata Syntax</link>" section. @@ -442,22 +442,27 @@ feature. This feature consists of one or more Linux kernel configuration parameters in a configuration fragment file - (<filename>.cfg</filename>) and an <filename>.scc</filename> file + (<filename>.cfg</filename>) and a <filename>.scc</filename> file that describes the fragment. </para> <para> The Symmetric Multi-Processing (SMP) fragment included in the - <filename>linux-yocto-3.4</filename> Git repository + <filename>linux-yocto-3.19</filename> Git repository consists of the following two files: <literallayout class='monospaced'> cfg/smp.scc: define KFEATURE_DESCRIPTION "Enable SMP" + define KFEATURE_COMPATIBILITY all + kconf hardware smp.cfg cfg/smp.cfg: CONFIG_SMP=y CONFIG_SCHED_SMT=y + # Increase default NR_CPUS from 8 to 64 so that platform with + # more than 8 processors can be all activated at boot time + CONFIG_NR_CPUS=64 </literallayout> You can find information on configuration fragment files in the "<ulink url='&YOCTO_DOCS_DEV_URL;#creating-config-fragments'>Creating Configuration Fragments</ulink>" @@ -584,7 +589,7 @@ </para> <para> - As an example, the <filename>linux-yocto-3.4</filename> + As an example, the <filename>linux-yocto-3.19</filename> tree defines three kernel types: "standard", "tiny", and "preempt-rt": <itemizedlist> @@ -671,15 +676,15 @@ The hardware-specific portion is typically defined independently, and then aggregated with each supported kernel type. - Consider this simple BSP description that supports the "mybsp" - machine: + Consider this simple BSP description that supports the + <replaceable>mybsp</replaceable> machine: <literallayout class='monospaced'> - mybsp.scc: - define KMACHINE mybsp + <replaceable>mybsp</replaceable>.scc: + define KMACHINE <replaceable>mybsp</replaceable> define KTYPE standard define KARCH i386 - kconf mybsp.cfg + kconf <replaceable>mybsp</replaceable>.cfg </literallayout> Every BSP description should define the <ulink url='&YOCTO_DOCS_REF_URL;#var-KMACHINE'><filename>KMACHINE</filename></ulink>, @@ -724,13 +729,13 @@ a single <filename>.cfg</filename> file. Consider the following: <literallayout class='monospaced'> - mybsp.scc: + <replaceable>mybsp</replaceable>.scc: define KMACHINE mybsp define KTYPE standard define KARCH i386 include standard.scc - include mybsp-hw.scc + include <replaceable>mybsp</replaceable>-hw.scc </literallayout> </para> @@ -738,8 +743,10 @@ In the above example, <filename>standard.scc</filename> aggregates all the configuration fragments, patches, and features that make up your standard kernel policy whereas - <filename>mybsp-hw.scc</filename> aggregates all those necessary - to support the hardware available on the "mybsp" machine. + <replaceable>mybsp</replaceable><filename>-hw.scc</filename> + aggregates all those necessary + to support the hardware available on the + <replaceable>mybsp</replaceable> machine. For information on how to break a complete <filename>.config</filename> file into the various configuration fragments, see the @@ -751,99 +758,98 @@ Many real-world examples are more complex. Like any other <filename>.scc</filename> file, BSP descriptions can aggregate features. - Consider the Fish River Island 2 (fri2) - BSP definition from the <filename>linux-yocto-3.4</filename> + Consider the Minnow BSP definition from the + <filename>linux-yocto-3.19</filename> Git repository: <literallayout class='monospaced'> - fri2.scc: - kconf hardware fri2.cfg - + minnow.scc: include cfg/x86.scc include features/eg20t/eg20t.scc include cfg/dmaengine.scc - include features/ericsson-3g/f5521gw.scc include features/power/intel.scc include cfg/efi.scc include features/usb/ehci-hcd.scc include features/usb/ohci-hcd.scc - include features/iwlwifi/iwlwifi.scc + include features/usb/usb-gadgets.scc + include features/usb/touchscreen-composite.scc + include cfg/timer/hpet.scc + include cfg/timer/rtc.scc + include features/leds/leds.scc + include features/spi/spidev.scc + include features/i2c/i2cdev.scc + + # Earlyprintk and port debug requires 8250 + kconf hardware cfg/8250.cfg + + kconf hardware minnow.cfg + kconf hardware minnow-dev.cfg </literallayout> </para> <para> - The <filename>fri2.scc</filename> description file includes + The <filename>minnow.scc</filename> description file includes a hardware configuration fragment - (<filename>fri2.cfg</filename>) specific to the Fish River - Island 2 BSP as well as several more general configuration + (<filename>minnow.cfg</filename>) specific to the Minnow + BSP as well as several more general configuration fragments and features enabling hardware found on the machine. This description file is then included in each of the three - "fri2" description files for the supported kernel types + "minnow" description files for the supported kernel types (i.e. "standard", "preempt-rt", and "tiny"). - Consider the "fri2" description for the "standard" kernel + Consider the "minnow" description for the "standard" kernel type: <literallayout class='monospaced'> - fri2-standard.scc: - define KMACHINE fri2 + minnow-standard.scc: + define KMACHINE minnow define KTYPE standard define KARCH i386 - include ktypes/standard/standard.scc - branch fri2 - - git merge emgd-1.14 + include ktypes/standard - include fri2.scc + include minnow.scc - # Extra fri2 configs above the minimal defined in fri2.scc + # Extra minnow configs above the minimal defined in minnow.scc include cfg/efi-ext.scc - include features/drm-emgd/drm-emgd.scc - include cfg/vesafb.scc + include features/media/media-all.scc + include features/sound/snd_hda_intel.scc - # default policy for standard kernels + # The following should really be in standard.scc + # USB live-image support include cfg/usb-mass-storage.scc + include cfg/boot-live.scc + + # Basic profiling + include features/latencytop/latencytop.scc + include features/profiling/profiling.scc + + # Requested drivers that don't have an existing scc + kconf hardware minnow-drivers-extra.cfg </literallayout> The <filename>include</filename> command midway through the file - includes the <filename>fri2.scc</filename> description that + includes the <filename>minnow.scc</filename> description that defines all hardware enablements for the BSP that is common to all kernel types. Using this command significantly reduces duplication. </para> <para> - This "fri2" standard description introduces a few more variables - and commands that are worth further discussion. - Notice the <filename>branch fri2</filename> command, which creates - a machine-specific branch into which source changes are applied. - With this branch set up, the <filename>git merge</filename> command - uses Git to merge in a feature branch named "emgd-1.14". - You could also handle this with the <filename>patch</filename> - command. - However, for commonly used features such as this, feature branches - are a convenient mechanism. - See the "<link linkend='feature-branches'>Feature Branches</link>" - section for more information. - </para> - - <para> - Now consider the "fri2" description for the "tiny" kernel type: + Now consider the "minnow" description for the "tiny" kernel type: <literallayout class='monospaced'> - fri2-tiny.scc: - define KMACHINE fri2 + minnow-tiny.scc: + define KMACHINE minnow define KTYPE tiny define KARCH i386 - include ktypes/tiny/tiny.scc - branch fri2 + include ktypes/tiny - include fri2.scc + include minnow.scc </literallayout> As you might expect, the "tiny" description includes quite a bit less. In fact, it includes only the minimal policy defined by the "tiny" kernel type and the hardware-specific configuration required for booting the machine along with the most basic functionality of - the system as defined in the base "fri2" description file. + the system as defined in the base "minnow" description file. </para> <para> |