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

[Anthony Liguori <anthony@codemonkey.ws>]

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
>