kernel-grub.bbclass: add a method to install/update for bzImage

Change in V3:
- Don't check for '$D' to be empty to support cross-install/cross-upgrade situation;
- Use $grubcfg instead of hardcoded '/boot/grub/*';

Change in V2: Create a "kernel-grub.bbclass" to do the job which means
it is disabled by default.

Test Case:
1. Add INHERIT_append = " kernel-grub" to local.conf and build a new kernel image rpm package.

2. Prepare a deployed target, and make sure your boot area has enough disk space (free space >= 5MB).

3. Download the new kernel image rpm to the target.

4. Before install/update, check boot area and menu

root@qemux86-64:~# ls /boot/
grub        vmlinuz

root@qemux86-64:~# cat /boot/grub/grub.cfg
menuentry "Linux" {
    set root=(hd0,1)
    linux /vmlinuz root=/dev/hdb2  rw  console=tty0  quiet
}

4. Install/update bzImage

root@qemux86-64:~# rpm -i kernel-image-3.10.11-yocto-standard-3.10.12+git0+285f93bf94_702040ac7c-r0.qemux86_64.rpm 
Caution! Update kernel may affect kernel-module!
update-alternatives: Linking //boot/bzImage to bzImage-3.10.11-yocto-standard

5. After install/update, check boot area and menu

root@qemux86-64:~# ls /boot/ -al
drwxr-xr-x    4 root     root          1024 Sep 18 06:58 .
drwxr-xr-x   17 root     root          4096 Sep 18 06:41 ..
lrwxrwxrwx    1 root     root            30 Sep 18 06:58 bzImage -> bzImage-3.10.11-yocto-standard
-rw-r--r--    1 root     root       5601808 Sep 18 06:45 bzImage-3.10.11-yocto-standard
drwxr-xr-x    4 root     root          1024 Sep 18 06:58 grub
-rwxr-x---    1 root     root       5601776 Sep 18 06:38 vmlinuz

root@qemux86-64:~# cat /boot/grub/grub.cfg 
menuentry "Update bzImage-3.10.11-yocto-standard-3.10.12+gitAUTOINC+285f93bf94_702040ac7c" {
    set root=(hd0,1)
    linux /bzImage-3.10.11-yocto-standard root=/dev/hdb2  rw  console=tty0  quiet
}
menuentry "Linux" {
    set root=(hd0,1)
    linux /vmlinuz root=/dev/hdb2  rw  console=tty0  quiet
}

6. Reboot target, 'Update bzImage-3.10.11-yocto-standard-3.10.12+gitAUTOINC+285f93bf94_702040ac7c' will be in the boot menu.

7. It supports GRUB 0.97 in which use menu.lst rather than grub.cfg as config file.

8. If you install the same rpm more than one time with '--force', there will be multiple kernel images in boot area and menu.

9. It works for dep and ipk.

//Hongxu

The following changes since commit 529bf977e956175bd8405ebffc88194192e44740:

update-rcd.bbclass: fix host/target test (2013-10-16 14:51:07 +0100)

are available in the git repository at:

git://git.pokylinux.org/poky-contrib hongxu/update-bzimage
http://git.pokylinux.org/cgit.cgi/poky-contrib/log/?h=hongxu/update-bzimage

Hongxu Jia (1):
kernel-grub.bbclass: add a method to install/update for bzImage

 meta/classes/kernel-grub.bbclass | 90 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 meta/classes/kernel-grub.bbclass

1.8.1.2