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authorScott Rifenbark <srifenbark@gmail.com>2017-09-07 16:43:49 -0700
committerRichard Purdie <richard.purdie@linuxfoundation.org>2017-09-13 18:00:19 +0100
commitf2d4f77afb9095d84d56ae067c513b80b73962e0 (patch)
treeadc68d66cb1e1c8351df9d7b72f134d6684b5d13
parentdb3c4c8557366e5ac374e474ac1ce535d89c5982 (diff)
downloadpoky-f2d4f77afb9095d84d56ae067c513b80b73962e0.tar.gz
kernel-dev: Updates to the kernel patch examples.
Switching to kernel version 4.12. Pulled some old commented stuff out. (From yocto-docs rev: c0a5c886256d3477ddaf670df4939bec1c73152e) Signed-off-by: Scott Rifenbark <srifenbark@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
-rw-r--r--documentation/kernel-dev/kernel-dev-common.xml133
1 files changed, 22 insertions, 111 deletions
diff --git a/documentation/kernel-dev/kernel-dev-common.xml b/documentation/kernel-dev/kernel-dev-common.xml
index 3af52eb352..eaf0146153 100644
--- a/documentation/kernel-dev/kernel-dev-common.xml
+++ b/documentation/kernel-dev/kernel-dev-common.xml
@@ -362,25 +362,26 @@
362 </para> 362 </para>
363 363
364 <para> 364 <para>
365 The following command shows how to create a local copy 365 The following commands show how to create a local copy
366 of the <filename>linux-yocto-4.9</filename> kernel: 366 of the <filename>linux-yocto-4.12</filename> kernel:
367 <literallayout class='monospaced'> 367 <literallayout class='monospaced'>
368 $ git clone git://git.yoctoproject.org/linux-yocto-4.9 linux-yocto-4.9.git 368 $ cd ~
369 Cloning into 'linux-yocto-4.9.git'... 369 $ git clone git://git.yoctoproject.org/linux-yocto-4.12 linux-yocto-4.12
370 remote: Counting objects: 5094108, done. 370 Cloning into 'linux-yocto-4.12'...
371 remote: Compressing objects: 100% (765113/765113), done. 371 remote: Counting objects: 6097195, done.
372 remote: Total 5094108 (delta 4294009), reused 5088388 (delta 4288312) 372 remote: Compressing objects: 100% (901026/901026), done.
373 Receiving objects: 100% (5094108/5094108), 1.02 GiB | 7.82 MiB/s, done. 373 remote: Total 6097195 (delta 5152604), reused 6096847 (delta 5152256)
374 Resolving deltas: 100% (4294009/4294009), done. 374 Receiving objects: 100% (6097195/6097195), 1.24 GiB | 7.81 MiB/s, done.
375 Resolving deltas: 100% (5152604/5152604), done.
375 Checking connectivity... done. 376 Checking connectivity... done.
376 Checking out files: 100% (56233/56233), done. 377 Checking out files: 100% (59846/59846), done.
377 </literallayout> 378 </literallayout>
378 </para></listitem> 379 </para></listitem>
379 </orderedlist> 380 </orderedlist>
380 </para> 381 </para>
381 382
382 <para> 383 <para>
383 At this point you have set up to start making modifications to 384 At this point, you are ready to start making modifications to
384 the kernel using traditional kernel development steps. 385 the kernel using traditional kernel development steps.
385 For a continued example, see the 386 For a continued example, see the
386 "<link linkend='using-traditional-kernel-development-to-patch-the-kernel'>Using Traditional Kernel Development to Patch the Kernel</link>" 387 "<link linkend='using-traditional-kernel-development-to-patch-the-kernel'>Using Traditional Kernel Development to Patch the Kernel</link>"
@@ -1010,97 +1011,6 @@
1010 $ devtool build linux-yocto 1011 $ devtool build linux-yocto
1011 </literallayout> 1012 </literallayout>
1012 </para></listitem> 1013 </para></listitem>
1013<!--
1014 <listitem><para>
1015
1016NOTE: This stuff is how it would have been if a *.wic file was created
1017 when the image was built earlier. That is the method used by the
1018 example in the wiki (https://wiki.yoctoproject.org/wiki/TipsAndTricks/KernelDevelopmentWithEsdk).
1019 I am leaving it here for now.
1020
1021 <emphasis>Create the Image With the New Kernel:</emphasis>
1022 Normally, you would create a new image using the
1023 <filename>devtool build-image</filename> command.
1024 However, this method can take some time and alters the
1025 kernel source folder.
1026 A faster option is to use
1027 <ulink url='https://linux.die.net/man/8/kpartx'><filename>kpartx</filename></ulink>
1028 to splice the new kernel into the image you have already built.
1029 <note>
1030 You might have to install <filename>kpartx</filename>
1031 onto your build host.
1032 </note>
1033 Follow these steps to create the image with the new kernel:
1034 <orderedlist>
1035 <listitem><para>
1036 <emphasis>Make a Copy of Your Wic File:</emphasis>
1037 Create a copy of your Wic from into the
1038 <filename>/tmp</filename> directory:
1039 <literallayout class='monospaced'>
1040 $ cp tmp/deploy/images/qemux86/core-image-minimal-qemux86.wic /tmp
1041 </literallayout>
1042 </para></listitem>
1043 <listitem><para>
1044 <emphasis>Create Loopback Devices for Partitions:</emphasis>
1045 Next, create loopback devices for each partition in
1046 the Wic file.
1047 <note>
1048 The first unused loopback device is automatically
1049 allocated.
1050 </note>
1051 In this example, the command's output uses a variable
1052 "<replaceable>X</replaceable>" to indicate the loopback
1053 device.
1054 The actual output you get when you run the command lists
1055 the actual loopback devices (e.g. "loop0p1", "loop0p2",
1056 and "loop0p3"):
1057 <literallayout class='monospaced'>
1058 $ sudo kpartx -v -a /tmp/core-image-minimal-qemux86.wic
1059 add map loop<replaceable>X</replaceable>p1 (253:6): 0 47446 linear /dev/loopX 2048
1060 add map loop<replaceable>X</replaceable>p2 (253:7): 0 119356 linear /dev/loopX 51200
1061 add map loop<replaceable>X</replaceable>p3 (253:8): 0 90112 linear /dev/loopX 170556
1062 </literallayout>
1063 </para></listitem>
1064 <listitem><para>
1065 <emphasis>Mount the First Device:</emphasis>
1066 The kernel is in the first device, so mount
1067 <filename>/dev/mapper/loop</filename><replaceable>X</replaceable><filename>p1</filename>:
1068 <note>
1069 Be sure to replace the "<replaceable>X</replaceable>"
1070 in "loop<replaceable>X</replaceable>p1" with the
1071 automatically allocated loopback device
1072 (e.g loop0p1).
1073 </note>
1074 <literallayout class='monospaced'>
1075 $ sudo mkdir /mnt/wic-p1
1076 $ sudo mount /dev/mapper/loop<replaceable>X</replaceable>p1 /mnt/wic-p1
1077 </literallayout>
1078 </para></listitem>
1079 <listitem><para>
1080 <emphasis>Copy Over the New Kernel:</emphasis>
1081 Now copy over new kernel using the following:
1082 <literallayout class='monospaced'>
1083 $ sudo cp workspace/sources/linux-yocto/arch/x86/boot/bzImage /mnt/wic-p1
1084 </literallayout>
1085 </para></listitem>
1086 <listitem><para>
1087 Finally, unmount the device and use
1088 <filename>kpartx</filename> to delete the partition
1089 mappings:
1090 <note>
1091 Replace the "<replaceable>X</replaceable>" in
1092 "loop<replaceable>X</replaceable>" with the
1093 automatically allocated loopback device from
1094 earlier (e.g "loop0").
1095 </note>
1096 <literallayout class='monospaced'>
1097 $ sudo umount /mnt/wic-p1
1098 $ sudo kpartx -d /dev/loop<replaceable>X</replaceable>
1099 </literallayout>
1100 </para></listitem>
1101 </orderedlist>
1102 </para></listitem>
1103-->
1104 <listitem><para> 1014 <listitem><para>
1105 <emphasis>Create the Image With the New Kernel:</emphasis> 1015 <emphasis>Create the Image With the New Kernel:</emphasis>
1106 Use the <filename>devtool build-image</filename> command 1016 Use the <filename>devtool build-image</filename> command
@@ -1260,9 +1170,9 @@ NOTE: This stuff is how it would have been if a *.wic file was created
1260 "<link linkend='getting-ready-for-traditional-kernel-development'>Getting Ready for Traditional Kernel Development</link>" 1170 "<link linkend='getting-ready-for-traditional-kernel-development'>Getting Ready for Traditional Kernel Development</link>"
1261 section, use the following commands to check out the 1171 section, use the following commands to check out the
1262 <filename>standard/base</filename> branch of the 1172 <filename>standard/base</filename> branch of the
1263 Linux Yocto 4.9 kernel: 1173 Linux Yocto 4.12 kernel:
1264 <literallayout class='monospaced'> 1174 <literallayout class='monospaced'>
1265 $ cd ~/linux-yocto-4.9 1175 $ cd ~/linux-yocto-4.12
1266 $ git checkout -b standard/base origin/standard/base 1176 $ git checkout -b standard/base origin/standard/base
1267 </literallayout> 1177 </literallayout>
1268 </para></listitem> 1178 </para></listitem>
@@ -1278,7 +1188,7 @@ NOTE: This stuff is how it would have been if a *.wic file was created
1278 Change to where the kernel source code is before making 1188 Change to where the kernel source code is before making
1279 your edits to the <filename>calibrate.c</filename> file: 1189 your edits to the <filename>calibrate.c</filename> file:
1280 <literallayout class='monospaced'> 1190 <literallayout class='monospaced'>
1281 $ cd ~/linux-yocto-4.9/init 1191 $ cd ~/linux-yocto-4.12/init
1282 </literallayout> 1192 </literallayout>
1283 </para></listitem> 1193 </para></listitem>
1284 <listitem><para> 1194 <listitem><para>
@@ -1326,12 +1236,13 @@ NOTE: This stuff is how it would have been if a *.wic file was created
1326 <filename>local.conf</filename>: 1236 <filename>local.conf</filename>:
1327 <literallayout class='monospaced'> 1237 <literallayout class='monospaced'>
1328 $ cd ~/poky/build/conf 1238 $ cd ~/poky/build/conf
1329 <replaceable>Add the following:</replaceable> 1239 </literallayout>
1330 1240 Add the following to the <filename>local.conf</filename>:
1331 SRC_URI_pn-linux-yocto = "git:///$HOME/linux-yocto-4.9;protocol=file;name=machine;branch=standard/base; \ 1241 <literallayout class='monospaced'>
1332 git:///home/scottrif/yocto-kernel-cache;protocol=file;type=kmeta;name=meta;branch=yocto-4.9;destsuffix=${KMETA}" 1242 SRC_URI_pn-linux-yocto = "git:///$HOME/linux-yocto-4.12;protocol=file;name=machine;branch=standard/base; \
1333SRCREV_meta_qemux86 = "${AUTOREV}" 1243 git:///home/scottrif/yocto-kernel-cache;protocol=file;type=kmeta;name=meta;branch=yocto-4.12;destsuffix=${KMETA}"
1334SRCREV_machine_qemux86 = "${AUTOREV}" 1244 SRCREV_meta_qemux86 = "${AUTOREV}"
1245 SRCREV_machine_qemux86 = "${AUTOREV}"
1335 </literallayout> 1246 </literallayout>
1336 You must be sure to specify the correct branch and machine 1247 You must be sure to specify the correct branch and machine
1337 types. 1248 types.