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[[Software/Android]]~ [[Software/Android/bc9]]~ [[Software/Android/bc9/kernel(2/2)]] #contents *Setup Android bootable linux kernel and userland for bc9 (gumstix) 1 [#f63b053a] **Setting up gumstix build environment [#mf860689] We use gumstix OpenEmbedded (OE) build system (bitbake).~ Bitbake is originally [[OpenEmbedded:http://wiki.openembedded.net/index.php/Main_Page]] build environment and [[Gumstix,Inc.:http://www.gumstix.com/]] modified it for their own purposes.~ Before you proceed, please understand standard setting up procedure of gumstix. -[[gumstix developer site - Getting started:http://www.gumstix.net/Software/cat/Getting-started/111.html]] -[[gumstix developer site - Setting up a build environment:http://www.gumstix.net/Software/view/Getting-started/Setting-up-a-build-environment/111.html]] -[[gumstix developer site - Replacing the file system image:http://www.gumstix.net/Software/view/Getting-started/Replacing-the-file-system-image/111.html]] **Check out source [#x1c35072] $ mkdir ~/gumstix $ cd ~/gumstix $ svn co https://gumstix.svn.sourceforge.net/svnroot/gumstix/trunk gumstix-oe **Setting up Environment (shell) [#da43bdd3] If you prefer setting up Environment via bash profile, do: $ cat gumstix-oe/extras/profile >> ~/.bashrc If you prefer setting up Environment temporally, do: $ . ~/gumstix/gumstix-oe/extras/profile or $ source ~/gumstix/gumstix-oe/extras/profile **Setting up source code caching [#efde2f96] Gumstix OE downloads source code during build operation. ~ So in order to avoid repeating download of every build operation, you had better to set up source code caching directory.~ At first, add new group for cache management and add operating user to this group. $ sudo groupadd oe $ sudo usermod -a -G oe {your_username} Next make source code storing directory and set owner and permission appropriately. $ sudo mkdir /usr/share/sources $ sudo chgrp oe /usr/share/sources $ sudo chmod 0775 /usr/share/sources $ sudo chmod ug+s /usr/share/sources **Adjusting build contents [#rff0a69e] Current default kernel version of gumstix verdex pro is 2.6.21.~ In contrast Android R1 kernel is version 2.6.25 kernel plus some Android unique drivers. ~ So we upgrade gumstix's kernel to version 2.6.24, which is less different to Android R1 2.6.25 kernel than 2.6.21.~ Then we made patch from diff of 2.6.24 gumstix kernel and 2.6.25 android kernel. With following adjustments, this patch is automatically applied during build operation.~ Procedures are as follows: +~Changing building kernel version~ ~/gumstix/gumstix-oe/com.gumstix.collection/conf/machine/include/gumstix.inc Modify this file as follows: diff -u gumstix.inc.original gumstix.inc --- gumstix.inc.original 2009-03-27 21:30:00.000000000 +0900 +++ gumstix.inc 2009-03-24 22:48:10.000000000 +0900 @@ -35,7 +35,7 @@ PREFERRED_PROVIDER_bluez-utils-dbus = "bluez-utils" PREFERRED_PROVIDER_gsmd="libgsmd" -PREFERRED_VERSION_gumstix-kernel = "2.6.21" +PREFERRED_VERSION_gumstix-kernel = "2.6.24" PREFERRED_VERSION_udev = "118" PREFERRED_VERSION_gnuplot = "4.0.0" PREFERRED_VERSION_dropbear = "0.47" +~Adjusting system image contents~ ~/gumstix-default-2.6.24/gumstix-oe/com.gumstix.collection/conf/machine/gumstix-custom-verdex.conf Modify this file as follows: diff -u gumstix-custom-verdex.conf.original gumstix-custom-verdex.conf --- gumstix-custom-verdex.conf.original 2009-03-30 15:02:26.000000000 +0900 +++ gumstix-custom-verdex.conf 2009-03-25 13:48:26.000000000 +0900 @@ -9,8 +9,8 @@ # # Your flash size = Total flash (in MB) - 1 (for linux kernel partition) -ROOT_FLASH_SIZE = "15" -#ROOT_FLASH_SIZE = "31" +#ROOT_FLASH_SIZE = "15" +ROOT_FLASH_SIZE = "31" # # Enable use of virtual terminal for LCD on tty1 if USE_VT = "1" +~Removing unbuildable module~ When you upgrade gumstix's kernel version to 2.6.24, wifistix module can't be built.~ ~/gumstix/gumstix-oe/com.gumstix.collection/packages/tasks/task-base-gumstix.bb So remove this module's build difinition from bitbake setting file as follows: --- task-base-gumstix.bb.original 2009-03-26 17:09:52.000000000 +0900 +++ task-base-gumstix.bb 2009-03-30 17:10:04.000000000 +0900 @@ -201,7 +201,6 @@ 　 RDEPENDS_task-base-gumstix-wifi = "\ task-base-gumstix-pcmcia \ - wifistix-modules \ wireless-tools \ wpa-supplicant \ +~Adding patch during kernel build in bitbake~ ~gumstix/gumstix-oe/com.gumstix.collection/packages/linux/gumstix-kernel_2.6.24.bb Modify this bitbake config file as follows: diff -u gumstix-kernel_2.6.24.bb.original gumstix-kernel_2.6.24.bb --- gumstix-kernel_2.6.24.bb.original 2009-03-26 19:23:32.000000000 +0900 +++ gumstix-kernel_2.6.24.bb 2009-03-27 22:01:53.000000000 +0900 @@ -46,7 +46,8 @@ file://smc911x-fixup.patch;patch=1 \ file://smc91x-fail-if-no-chip.patch;patch=1 \ file://one-wire.patch;patch=1 \ + file://diff-kernel-original-android.patch;patch=1 \ ${@base_contains('MACHINE_FEATURES', 'rgb16','file://pxafb-backto16.patch;patch=1', '',d)} \ " Here is patch file added in above procedure.~ &ref(diff-kernel-original-android.patch);~ This file applies following modifications to gumstix's original kernel source code.~ ・Adding Android unique drivers required to boot Android userland~ ・Fix of some Kconfig and Makefile~ ・Modification of Framebuffer driver (add panning function to pxafb.c)~ Put it in following directory: ~gumstix/gumstix-oe/com.gumstix.collection/packages/linux/gumstix-kernel-2.6.24/ +~Tochscreen driver adjustment~ &ref(tsc2003.c);~ This is modified touchscreen driver (tsc2003.c) for Android.~ Because of execution procedure of gumstix-kernel_2.6.24.bb, this file can't be included in diff-kernel-original-android.patch file.~ Download and replace original tsc2003.c with this file.~ Original tsc2003.c is in following directory: ~gumstix/gumstix-oe/com.gumstix.collection/packages/linux/gumstix-kernel-2.6.24/ +~defconfig adjustment~ When you apply above patch and adjustments, you also require additional item in kernel config for Android drivers.~ &ref(defconfig);~ Download and recplace original gumstix's defconfig with this modified defconfig.~ Original defconfig is in following directory: ~gumstix/gumstix-oe/com.gumstix.collection/packages/linux/gumstix-kernel-2.6.24/gumstix-custom-verdex/ **building source code [#rf33984b] After finish adjustments, proceed the build as follows: bitbake gumstix-basic-image Bitbake downloads all source code and build ARM Cross Toolchain during the first build.~ When the build is finished, onboard FlashROM installable kernel image file and system image file are generated.~ $ ls -1 ~/gumstix/gumstix-oe/tmp/deploy/glibc/images/gumstix-custom-verdex/ Angstrom-gumstix-basic-image-glibc-ipk-2007.9-test-20090330-gumstix-custom-verdex.rootfs.jffs2 gumstix-basic-image-gumstix-custom-verdex.jffs2 (simlink to above Angstrom....jffs2) modules-2.6.24-r1-gumstix-custom-verdex.tgz uImage-2.6.24-r1-gumstix-custom-verdex.bin Additionally do following build: bitbake gumstix-directfb-image System image file which include DirectFB library and commands are generated. Angstrom-gumstix-directfb-image-glibc-ipk-2007.9-test-20090330-gumstix-custom-verdex.rootfs.jffs2 gumstix-directfb-image-gumstix-custom-verdex.jffs2 (simlink to above Angstrom...) This system image file is convenient to check functions of framebuffer driver.~ By using DirectFB test applications such as df_dok or df_neo, you can check framebuffer driver drawing function before you boot Android. [[Software/Android/bc9/kernel(2/2)]] --------------------------------------- RIGHT:by Satoshi OTSUKA
