docs: update HACKING to point to Gerrit

Change-Id: If79e86c731ac06aaefca1aebde40e7cb3de68e4d
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

HACKING

@@ -1,13 +1,22 @@
-Submitting patches to the OpenOCD mailing list:
+Submitting patches to the OpenOCD Gerrit server:
 
-By the time you have read this, one supposes that 
-you have figured out how to clone the OpenOCD git
-repository.
+OpenOCD is to some extent a "self service" open source project, so to
+contribute, you must follow the standard procedures to have the best
+possible chance to get your changes accepted.
 
-Below is a basic workflow and specific instructions 
-to get you going with git and patches.
+The procedure to create a patch is essentially:
 
-0. Clone the git repository, rather than just
+- make the changes
+- create a commit
+- send the changes to the Gerrit server for review
+- correct the patch and re-send it according to review feedback
+ 
+
+0. Create a Gerrit account at:
+
+http://openocd.zylin.com
+
+1. Clone the git repository, rather than just
 download the source. 
 
 git clone git://openocd.git.sourceforge.net/gitroot/openocd/openocd
@@ -17,19 +26,32 @@ the slower http protocol:
 
 git clone http://repo.or.cz/r/openocd.git
 
-1. Set up git with your name and email:
+2. Set up Gerrit with your local repository. All this does it
+to instruct git locally how to send off the changes.
+
+Add a new remote to git using Gerrit username:
+
+git remote add review ssh://USERNAME@openocd.zylin.com:29418/openocd.git
+git config remote.review.push HEAD:refs/for/master
+
+You will need to install this hook, we will look into a better
+solution:
+
+scp -p -P 29418 USERNAME@openocd.zylin.com:hooks/commit-msg .git/hooks/
+
+3. Set up git with your name and email:
 
 git config --global user.name "John Smith"
 git config --global user.email "john@smith.org"
 
-2. Work on your patches. Split the work into 
+4. Work on your patches. Split the work into 
 multiple small patches that can be reviewed and
 applied seperately and safely to the OpenOCD
 repository.
 
 while(!done) {
   work - edit files using your favorite editor.
-  run "git commit -a" to commit all changes. 
+  run "git commit -s -a" to commit all changes. 
 }
 
 TIP! use "git add ." before commit to add new files.
@@ -41,16 +63,21 @@ longer comments over several
 lines...
 -----
 
-3. Next you need to make sure that your patches
+5. Next you need to make sure that your patches
 are on top of the latest stuff on the server and
 that there are no conflicts.
 
-git pull --rebase
+git pull --rebase origin/master
 
-4. Generate the patch files. This will generate
-patches for all commits that are on top of
-the latest stuff on the server:
+6. Send the patches to the Gerrit server for review.
 
-git format-patch origin/master
+git push review
 
-5. Email the patches to openocd-development@lists.berlios.de  
+7. Forgot something, want to add more? Just make the changes and do:
+
+git commit --amend
+git push review
+
+Further reading:
+
+http://www.coreboot.org/Git