Transcript: creating one generic Atom BSP from another

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Revision as of 21:34, 6 July 2011 by Tzanussi (talk | contribs)
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Starting from scratch, we'll take a relatively generic Atom-based BSP and create another Atom-based BSP from that, that stands a good chance of booting and even booting into graphics, to serve as a starting point for a new BSP.

First set up poky:

trz@elmorro:/usr/local/test/yocto$ git init
Initialized empty Git repository in /usr/local/test/yocto/.git/
trz@elmorro:/usr/local/test/yocto$ git remote add poky git://git.yoctoproject.org/poky.git
trz@elmorro:/usr/local/test/yocto$ git remote update
Fetching poky
remote: Counting objects: 106111, done.
remote: Compressing objects: 100% (36106/36106), done.
remote: Total 106111 (delta 72275), reused 99193 (delta 66808)
Receiving objects: 100% (106111/106111), 69.51 MiB | 518 KiB/s, done.
Resolving deltas: 100% (72275/72275), done.
From git://git.yoctoproject.org/poky
 * [new branch]      1.1_M1     -> poky/1.1_M1
 * [new branch]      1.1_M2     -> poky/1.1_M2
 * [new branch]      bernard    -> poky/bernard
 * [new branch]      blinky     -> poky/blinky
 * [new branch]      clyde      -> poky/clyde
 * [new branch]      elroy      -> poky/elroy
 * [new branch]      green      -> poky/green
 * [new branch]      laverne    -> poky/laverne
 * [new branch]      master     -> poky/master
 * [new branch]      pinky      -> poky/pinky
 * [new branch]      purple     -> poky/purple
 * [new tag]         1.1_M1.final -> 1.1_M1.final
 * [new tag]         1.1_M2.rc1 -> 1.1_M2.rc1
 * [new tag]         bernard-5.0.1 -> bernard-5.0.1
 * [new tag]         pinky-3.1.2 -> pinky-3.1.2
From git://git.yoctoproject.org/poky
 * [new tag]         1.1_M1.rc1 -> 1.1_M1.rc1
 * [new tag]         1.1_M1.rc2 -> 1.1_M1.rc2
 * [new tag]         bernard-1.0rc1 -> bernard-1.0rc1
 * [new tag]         bernard-5.0 -> bernard-5.0
 * [new tag]         bernard-5.0-alpha -> bernard-5.0-alpha
 * [new tag]         bernard-5.0rc1 -> bernard-5.0rc1
 * [new tag]         bernard-5.0rc2 -> bernard-5.0rc2
 * [new tag]         laverne-4.0 -> laverne-4.0
 * [new tag]         laverne-4.0.1 -> laverne-4.0.1
 * [new tag]         m4         -> m4
 * [new tag]         purple-3.2 -> purple-3.2
 * [new tag]         purple-3.2.1 -> purple-3.2.1

trz@elmorro:/usr/local/test/yocto$ git checkout -b bernard0 poky/bernard
Branch bernard0 set up to track remote branch bernard from poky.
Switched to a new branch 'bernard0'
trz@elmorro:/usr/local/test/yocto$ git checkout -f

Now check out meta-intel:

trz@elmorro:/usr/local/test/yocto$ mkdir meta-intel
trz@elmorro:/usr/local/test/yocto$ cd meta-intel
trz@elmorro:/usr/local/test/yocto/meta-intel$ git init
Initialized empty Git repository in /usr/local/test/yocto/meta-intel/.git/

trz@elmorro:/usr/local/test/yocto/meta-intel$ git remote add meta-intel git://git.yoctoproject.org/meta-intel.git
trz@elmorro:/usr/local/test/yocto/meta-intel$ git remote update
Fetching meta-intel
remote: Counting objects: 1240, done.
remote: Compressing objects: 100% (1008/1008), done.
remote: Total 1240 (delta 513), reused 85 (delta 27)
Receiving objects: 100% (1240/1240), 1.55 MiB | 510 KiB/s, done.
Resolving deltas: 100% (513/513), done.
From git://git.yoctoproject.org/meta-intel
 * [new branch]      1.1_M1     -> meta-intel/1.1_M1
 * [new branch]      1.1_M2     -> meta-intel/1.1_M2
 * [new branch]      bernard    -> meta-intel/bernard
 * [new branch]      dvhart/n450 -> meta-intel/dvhart/n450
 * [new branch]      laverne    -> meta-intel/laverne
 * [new branch]      master     -> meta-intel/master

trz@elmorro:/usr/local/test/yocto/meta-intel$ git checkout -b bernard0 meta-intel/bernard
Branch bernard0 set up to track remote branch bernard from meta-intel.
Switched to a new branch 'bernard0'
trz@elmorro:/usr/local/test/yocto/meta-intel$ git checkout -f

The crownbay-noemgd is the closest thing we have to generic for Atom-based BSPs, so let's start with that:

trz@elmorro:/usr/local/test/yocto/meta-intel$ cp -a meta-crownbay/ meta-mymachine

We want to get rid of anything crownbay, but keep and rename anything crownbay-noemgd. So:

trz@elmorro:/usr/local/test/yocto/meta-intel$ rm meta-mymachine/conf/machine/crownbay.conf
trz@elmorro:/usr/local/test/yocto/meta-intel$ mv meta-mymachine/conf/machine/crownbay-noemgd.conf meta-mymachine/conf/machine/mymachine.conf

Next, let's look at mymachine.conf and see which, if any, changes we need there. Aside from the obvious comment changes (lines starting with '#'), there's nothing to change except for the SRCREV lines at the end, which basically tell the recipe which kernel commits to use.

First, we need to figure out which kernel we're using. For our bernard checkout, we see from the line in the mymachine.conf we copied that it's linux-yocto-stable:

PREFERRED_PROVIDER_virtual/kernel ?= "linux-yocto-stable"

At the bottom of mymachine.conf, we see:

SRCREV_machine_pn-linux-yocto_crownbay-noemgd ?= "56fe215d3f1a2cc3a5a26482ac9809ba44495695"
SRCREV_meta_pn-linux-yocto_crownbay-noemgd ?= "e1f85a470934a0cf6abde5d95533e74501822c6b"

SRCREV_machine_pn-linux-yocto-stable_crownbay-noemgd ?= "56fe215d3f1a2cc3a5a26482ac9809ba44495695"
SRCREV_meta_pn-linux-yocto-stable_crownbay-noemgd ?= "e1f85a470934a0cf6abde5d95533e74501822c6b"

Since we're only interested in linux-yocto-stable, we can remove the linux-yocto SRCREVS.