Re: [Qemu-devel] New way of working with upstream Bochs BIOS

[Andre Przywara]

Anthony Liguori wrote:
> I've setup a git mirror of Bochs on repo.or.cz.  I've also restructured 
> the bios.diff into a patch queue and recorded what changeset we're 
> using.  Now, to recreate the bios.bin that we ship, use the following 
> instructions:
Nice. But is requiring guilt (ever googled for it ;-) and poking around 
in .git really necessary? I'd suggest to force all patches to be in a 
(at least simulated) mbox format (as 0002-0005 are) and using "git am" 
in a for loop.

> $ export QEMUSRC=/path/to/qemu/svn

> $ git clone git://repo.or.cz/bochs-mirror.git
> $ cd bochs-mirror
> $ git checkout -b qemu-bios $(cat $QEMUSRC/pc-bios/bios-pq/HEAD)
If you would create a branch on the remote repo, one could use
$ git init && git fetch git://... qemu-bios:qemu-bios
which would directly get the desired branch only.

> $ mkdir -p .git/patches
> $ ln -s $QEMUSRC/pc-bios/bios-pq .git/patches/qemu-bios
> $ touch .git/patches/qemu-bios/status
> $ guilt push -a
could be replaced with
$ for p in $(cat $QEMUSRC/pc-bios/bios-pq/series); do git am $p; done

> $ ./configure

> $ cd bios
> $ make
> $ cp BIOS-bochs-latest $QEMUSRC/pc-bios/bios.bin
$ make bios
covers the above three steps.

> New patches against bochs should go in pc-bios/bios-pq with series being 
> updated appropriately.  When we bump to a new version of the bochs bios, 
> we should update pc-bios/HEAD appropriately.  The bochs mirror gets 
> updated daily with a cron job for now.

BTW: I think the #define BX_QEMU does not belong in a header file, but 
in a Makefile. What about pouring the above commands in a Makefile, 
which automatically fetches, patches and builds the BIOS? Normally this 
process would not be triggered, but only on explicit request.

Or patch the Makefile in the bochs-mirror.git:qemu-bios branch:
diff --git a/bios/Makefile.in b/bios/Makefile.in
index 5c7bd4f..0205dbe 100644
--- bochs-mirror/bios/Makefile.in
+++ bochs-mirror/bios/Makefile.in
@@ -41,7 +41,7 @@ RANLIB = @RANLIB@

 BCC = bcc
 GCC = gcc
-GCC32 = gcc -m32 -fno-stack-protector
+GCC32 = gcc -m32 -fno-stack-protector -DBX_QEMU
 AS86 = as86

 BX_INCDIRS = -I.. -I$(srcdir)/.. -I../iodev -I$(srcdir)/../iodev


Regards,
Andre.

--
Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany
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