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authorScott Rifenbark <scott.m.rifenbark@intel.com>2013-01-10 16:27:04 -0600
committerRichard Purdie <richard.purdie@linuxfoundation.org>2013-01-16 15:59:18 +0000
commit5b1098dc0b486be2c21caa15b93e52c42372e0a4 (patch)
tree12db7b6c9e2532bb7cd38dd95f5f3dc0384ab71c /documentation/kernel-dev/kernel-dev-advanced.xml
parentb663741f7fa93af2953a7546ac1951f8f4952546 (diff)
downloadpoky-5b1098dc0b486be2c21caa15b93e52c42372e0a4.tar.gz
kernel-dev: Intermediary edits to the "branches" section.
(From yocto-docs rev: d12e98f4b80feb1538b51cd9e3a8c204c86f13fc) 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.xml38
1 files changed, 21 insertions, 17 deletions
diff --git a/documentation/kernel-dev/kernel-dev-advanced.xml b/documentation/kernel-dev/kernel-dev-advanced.xml
index 0c9808c35e..35b935eced 100644
--- a/documentation/kernel-dev/kernel-dev-advanced.xml
+++ b/documentation/kernel-dev/kernel-dev-advanced.xml
@@ -1377,31 +1377,35 @@ the KTYPE has changed, now set to "tiny".
1377 <title>Working with Branches</title> 1377 <title>Working with Branches</title>
1378 1378
1379 <para> 1379 <para>
1380 Many linux-yocto-custom derived recipes will be using Linux kernel 1380 Many recipes based on the <filename>linux-yocto-custom.bb<filename>
1381 sources with only a single branch: "master". 1381 use Linux kernel sources that have only the single branch - "master".
1382 However, when you are working with multiple boards and architectures, 1382 However, if you work with multiple boards and architectures,
1383 you are likely to run into the situation where a series of patches 1383 you are likely to run into the situation where a series of patches
1384 are needed for one board to boot. 1384 are needed for one board to boot.
1385 Sometimes, these patches are works-in-progress or fundamentally wrong, 1385 Sometimes, these patches are works-in-progress or fundamentally wrong,
1386 yet still necessary for specific boards. 1386 yet still necessary for specific boards.
1387 In these situations, you most likely do not want to include these 1387 In these situations, you most likely do not want to include these
1388 patches in every kernel you build. 1388 patches in every kernel you build (i.e. have the patches as part of
1389 You have a couple of options. 1389 the lone "master" branch).
1390 It is situations like these that give rise to multiple branches used
1391 within a Linux kernel sources Git repository.
1390 </para> 1392 </para>
1391 1393
1392 <para> 1394 <para>
1393 First, you could encapsulate these patches in a feature description 1395 If you are supporting multiple boards and architectures, you have
1394 and only include them in the BSP description for the board(s) that 1396 some options as to how you want to isolate your changes:
1395 require them. 1397 <itemizedlist>
1396 For more information, see the 1398 <listitem><para><emphasis>Include feature patches in the BSP:</emphasis>
1397 "<link linkend='patches'>Patches</link>" and 1399 Encapsulate patches in a feature description and only include
1398 "<link linkend='bsp-descriptions'>BSP Descriptions</link>" sections. 1400 the patches in the BSP descriptions of the applicable boards.
1399 </para> 1401 For more information, see the
1400 1402 "<link linkend='patches'>Patches</link>" and
1401 <para> 1403 "<link linkend='bsp-descriptions'>BSP Descriptions</link>"
1402 Alternatively, you can create a branch in your Linux kernel sources 1404 sections.</para></listitem>
1403 and apply the patches there. 1405 <listitem><para><emphasis>Create a machine branch:</emphasis>
1404 You can then specify this new branch as the 1406 You can create a machine branch in your Linux kernel sources
1407 and apply the patches there.
1408 You can then specify this new branch as the
1405 <filename>KBRANCH</filename> to use for this board. 1409 <filename>KBRANCH</filename> to use for this board.
1406 You can do this in the recipe with the 1410 You can do this in the recipe with the
1407 <filename>KBRANCH</filename> variable: 1411 <filename>KBRANCH</filename> variable: