Re: [SeaBIOS] [Qemu-devel] [PATCHv3] Load "bootsplash.jpg" if present

[Kevin O'Connor]

On Mon, Aug 02, 2010 at 11:52:22AM -0500, Anthony Liguori wrote:
> BTW, we need to document somewhere any assumptions SeaBIOS has about
> the JPEG.  I see that it expects a 1024x768 image.  Any additional
> restrictions on the jpeg image?

I listed some notes in a previous email:
> > Some notes:
> >
> > This uses the qemu "rom" interface for loading the jpeg file.  It
> > seems to work, but I'm not sure if this is strictly correct.
> >
> > The jpeg viewer in SeaBIOS will look at the image size and try to find
> > a vesa graphics mode that supports that size.  So, choose images that
> > are exactly 640x480, 1024x768, etc.  Also, the SeaBIOS viewer has
> > stripped down support for jpegs - not all valid jpegs will work.  Some
> > quick tests with the netpbm tools worked okay for me.
> >
> > SeaBIOS only shows the bootsplash during the interval between vgabios
> > init and OS execution.  This is generally too short a time to be seen.
> > Add "-menu boot=on" to the qemu command line to have it shown longer.
> >
> > Unfortunately, the vgabios doesn't support writing text to the screen
> > while in a vesa video mode.  So, this means that if a user selects F12
> > for the boot menu, they can't actually see the boot menu.  This will
> > need to be fixed in SeaBIOS in a follow up patch.

-Kevin

[Qemu-devel] [PATCHv3] Load "bootsplash.jpg" if present

[Anthony Liguori]

On 08/02/2010 01:10 PM, Kevin O'Connor wrote:
> On Mon, Aug 02, 2010 at 11:52:22AM -0500, Anthony Liguori wrote:
> > BTW, we need to document somewhere any assumptions SeaBIOS has about
> > the JPEG.  I see that it expects a 1024x768 image.  Any additional
> > restrictions on the jpeg image?
>
> I listed some notes in a previous email:

Right, we need this in either docs/seabios.txt in qemu.git or in a file 
in seabios.git I think.

Regards,

Anthony Liguori
> > > Some notes:
> > >
> > > This uses the qemu "rom" interface for loading the jpeg file.  It
> > > seems to work, but I'm not sure if this is strictly correct.
> > >
> > > The jpeg viewer in SeaBIOS will look at the image size and try to find
> > > a vesa graphics mode that supports that size.  So, choose images that
> > > are exactly 640x480, 1024x768, etc.  Also, the SeaBIOS viewer has
> > > stripped down support for jpegs - not all valid jpegs will work.  Some
> > > quick tests with the netpbm tools worked okay for me.
> > >
> > > SeaBIOS only shows the bootsplash during the interval between vgabios
> > > init and OS execution.  This is generally too short a time to be seen.
> > > Add "-menu boot=on" to the qemu command line to have it shown longer.
> > >
> > > Unfortunately, the vgabios doesn't support writing text to the screen
> > > while in a vesa video mode.  So, this means that if a user selects F12
> > > for the boot menu, they can't actually see the boot menu.  This will
> > > need to be fixed in SeaBIOS in a follow up patch.
> >
> > -Kevin