Re: [Qemu-devel] [PATCH v3] Add optionrom compatible with fw_cfg DMA version

[Marc Marí]

On Tue, 26 Jan 2016 11:11:54 +0000
Stefan Hajnoczi <address@hidden> wrote:

> On Mon, Jan 25, 2016 at 02:17:48PM +0100, Marc Marí wrote:
> > +linuxboot_dma.img: linuxboot_dma.o
> > +   $(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -m elf_i386
> > -Ttext 0 -e _start -s -o $@ $<,"  Building $(TARGET_DIR)$@") +
> >  %.img: %.o
> >     $(call quiet-command,$(LD) $(LDFLAGS_NOPIE) -Ttext 0 -e
> > _start -s -o $@ $<,"  Building $(TARGET_DIR)$@")  
> 
> Why is -m elf_i386 necessary for linuxboot_dma.img but not for the
> other *.img files?

I cannot give a precise explanation. But if I don't force an output
type, I get this error:

Building optionrom/linuxboot_dma.img
ld: i386 architecture of input file `linuxboot_dma.o' is incompatible
with i386:x86-64 output

Marc