Re: [Qemu-devel] SeaBIOS regression

[Gerd Hoffmann]

On Tue, Feb 05, 2019 at 10:31:24AM +0100, Thomas Huth wrote:
> On 2019-02-05 08:52, Gerd Hoffmann wrote:
> > On Mon, Feb 04, 2019 at 04:10:37PM +0100, Thomas Huth wrote:
> >>
> >>  Hi Gerd,
> >>
> >> I noticed that certain FreeDOS images are not working correctly anymore
> >> with the current version of QEMU, for example
> >> http://www.qemu-advent-calendar.org/2016/download/day10.tar.xz ... It
> >> aborts with:
> >>
> >>  Error reading from drive C: DOS area: write-protection violation attempted
> >>
> >> I've bisected the issue, and it has apparently been introduced with:
> >>
> >>  cd1bfd5ef336166b275a09dc9842542bf5e63ae3
> >>  seabios: update bios and vgabios binaries
> >>
> >> Any idea what might be going wrong here?
> > 
> > Hmm, no.  bisect seabios?
> 
> I haven't bisected yet, but it seems to be related to CONFIG_ATA_DMA=y
> in our roms/config.seabios-128k config file. When I switch that to "n",
> then the old FreeDOS disks are working again...

Hmm, guess I should turn that off again on the next update (there will
be a seabios 1.12.1 release before qemu 4.0).

cheers,
  Gerd