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From: Gerd Hoffmann <kraxel@redhat.com>
Date: Tue, 02 Feb 2016 13:04:55 +0100
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Subject: Re: [Qemu-devel] [PATCH v4] Add optionrom compatible with fw_cfg
	DMA version
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To: Marc =?ISO-8859-1?Q?Mar=ED?= <markmb@redhat.com>
Cc: Marc =?ISO-8859-1?Q?Mar=ED?= <marc.mari.barcelo@gmail.com>, "Gabriel
	L. Somlo" <somlo@cmu.edu>, qemu-devel@nongnu.org, Kevin O'Connor <kevin@koconnor.net>, Stefan Hajnoczi <stefanha@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Laszlo <lersek@redhat.com>

On Di, 2016-02-02 at 12:06 +0100, Gerd Hoffmann wrote:
>   Hi,
>=20
> >  %.img: %.o
> > -	$(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -Ttext 0 -e _start -s -o =
$@ $<,"  Building $(TARGET_DIR)$@")
> > +	$(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -m elf_i386 -Ttext 0 -e _=
start -s -o $@ $<,"  Building $(TARGET_DIR)$@")
>=20
> Hmm, that breaks the windows cross build:
>=20
> make: Entering directory `/home/kraxel/projects/qemu/build-win32'
>   Building optionrom/linuxboot_dma.img
> i686-w64-mingw32-ld: unrecognised emulation mode: elf_i386
> Supported emulations: i386pe
> make[1]: *** [linuxboot_dma.img] Error 1

Testing shows two more problems:

(1) initrd loading is broken, kernel complains it finds only gibberish:

[    0.934582] Unpacking initramfs...
[    1.166983] Initramfs unpacking failed: junk in compressed archive
[    1.168458] Freeing initrd memory: 32812k freed

(2) going back to non-dma boot via -M pc-$old doesn't work, appearently
    fw_cfg dma is enabled even for old machine types.

cheers,
  Gerd