DeployingANewMachine

Creating a new Machine from an existing Machine definition

In this example, we are copying the machine definition vr-om37-asdfridge and making one for vr-om37-asdfridge-gen3

All these steps are on embedded-dev.

Machine file

1. start in this directory: /home/yocto-danny/poky/meta-venture/conf/machine on embedded-dev
2. cp vr-om37-asdfridge.conf vr-om37-asdfridge-gen3.conf
3. most of the configuration is done in the recipes instead of this file though.

Kernel recipe

1. next directory: /home/yocto-danny/poky/meta-venture/recipes-kernel/linux
2. edit linux-omap3-venture_2.6.37.bb
3. add the new machine to COMPATIBLE_MACHINE (todo: autodetect vr*am35 or vr*om37 in machine name)
4. add the new machine as a DEFAULT_PREFERENCE (DEFAULT_PREFERENCE_vr-om37-asdfridge-gen3 = "1") (todo: PREFERRED_PROVIDER in machine.conf?)
5. add extra patches in the SRC_URI definition for that machine (todo: use git per-machine branches for this)
6. adding all TODOs would eliminate the need to edit this file for new machines...
7. copy kernel defconfig file from old device

mkdir /home/yocto-danny/poky/meta-venture/recipes-kernel/linux/linux-omap3-venture/vr-om37-asdfridge-gen3
cp /home/yocto-danny/poky/meta-venture/recipes-kernel/linux/linux-omap3-venture/vr-om37-asdfridge/defconfig /home/yocto-danny/poky/meta-venture/recipes-kernel/linux/linux-omap3-venture/vr-om37-asdfridge-gen3/defconfig

Adding kernel patches

• Probably best for an example... in this case, for the new LCD (in linux kernel git dir):

venture@embedded-dev:~/git/linux-omap3-venture$ git checkout -b new-lcd-1024-600
Switched to a new branch 'new-lcd-1024-600'
venture@embedded-dev:~/git/linux-omap3-venture$ vi drivers/video/omap2/displays/panel-venture.c
venture@embedded-dev:~/git/linux-omap3-venture$ git commit -am "Timings for HannStar HSD100IFW4-A @ 54 MHz pixclock"
[new-lcd-1024-600 88857c2] Timings for HannStar HSD100IFW4-A @ 54 MHz pixclock
1 file changed, 8 insertions(+), 9 deletions(-)
venture@embedded-dev:~/git/linux-omap3-venture$ git format-patch HEAD~1
0001-Timings-for-HannStar-HSD100IFW4-A-54-MHz-pixclock.patch

• copy any kernel patches into `/home/yocto-danny/poky/meta-venture/recipes-kernel/linux/linux-omap3-venture/(MACHINE)/

venture@embedded-dev:~/git/linux-omap3-venture$ cp 0001-Timings-for-HannStar-HSD100IFW4-A-54-MHz-pixclock.patch /home/yocto-danny/poky/meta-venture/recipes-kernel/linux/linux-omap3-venture/vr-om37-asdfridge-gen3/

• (switch to yocto build env) add line for SRC_URI:

[YOCTO-DANNY] /home/yocto-danny/poky/build $ vi ../meta-venture/recipes-kernel/linux/linux-omap3-venture_2.6.37.bb
...
SRC_URI_append_vr-om37-asdfridge-gen3 += "file://0001-Timings-for-HannStar-HSD100IFW4-A-54-MHz-pixclock.patch"
...

u-boot

• edit [YOCTO-DANNY] /home/yocto-danny/poky/build $ vi ../meta-venture/recipes-kernel/u-boot/u-boot_git.bb
• clone old device entry, change machine name to match
• if branch or pegged commit needs to change, do that here as well (and in git, if course, remember to git push)

vr-setup-gpio

• in svn dir, add entry for new machine

kevinb@embedded-dev:~/svn/vr/linux/src/vrreader-board-utils$ svn cp vr-setup-gpio-vr-om37-asdfridge vr-setup-gpio-vr-om37-asdfridge-gen3
A         vr-setup-gpio-vr-om37-asdfridge-gen3
kevinb@embedded-dev:~/svn/vr/linux/src/vrreader-board-utils$ svn ci -m "adding vr-setup-gpio file for vr-om37-asdfridge-gen3 MACHINE" 
Adding         vrreader-board-utils/vr-setup-gpio-vr-om37-asdfridge-gen3
Committed revision 630.

• then edit the vr-setup-gpio.bb file and bump SRCREV:

venture@embedded-dev:/home/yocto-danny/poky/build$ vi ../meta-venture/recipes-venture/vrreader-board-utils/vr-setup-gpio.bb

...
SRCREV="630"
...

splash image

is machine-specific.

/home/yocto-danny/poky/meta-venture/recipes-core/psplash $ vi psplash_git.bbappend

x server

is machine specific.

/home/yocto-danny/poky/meta-venture/recipes-graphics/xorg-xserver/xserver-xf86-config $ cp -r vr-om37-asdfridge/ vr-om37-asdfridge-gen3

do the build!

1. in yocto build env:

[YOCTO-DANNY] /home/yocto-danny/poky/build $ MACHINE=vr-om37-asdfridge-gen3 bitbake venture-image-asdfridge