Two vga cards will listen on the same legacy (isa) ioports. Due to this conflict only one of the two cards will work correctly in vga mode. Print a warning message in that case.
Signed-off-by: Gerd Hoffmann <[email protected]> --- hw/display/vga.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/hw/display/vga.c b/hw/display/vga.c index c82e6d240a..a6c246f76b 100644 --- a/hw/display/vga.c +++ b/hw/display/vga.c @@ -2273,6 +2273,7 @@ MemoryRegion *vga_init_io(VGACommonState *s, Object *obj, void vga_init(VGACommonState *s, Object *obj, MemoryRegion *address_space, MemoryRegion *address_space_io, bool init_vga_ports) { + static bool vgaports_registered; MemoryRegion *vga_io_memory; const MemoryRegionPortio *vga_ports, *vbe_ports; @@ -2289,6 +2290,11 @@ void vga_init(VGACommonState *s, Object *obj, MemoryRegion *address_space, 1); memory_region_set_coalescing(vga_io_memory); if (init_vga_ports) { + if (vgaports_registered) { + warn_report("multiple vga cards may not work as expected"); + } else { + vgaports_registered = true; + } portio_list_init(&s->vga_port_list, obj, vga_ports, s, "vga"); portio_list_set_flush_coalesced(&s->vga_port_list); portio_list_add(&s->vga_port_list, address_space_io, 0x3b0); -- 2.9.3
