Re: Twister savagefb doesn't sync

["Antonino A. Daplas" <adaplas@gmail.com>]

Vassilis Virvilis wrote:
> Antonino A. Daplas wrote:
> 
>>
>> Too many differences since the timings for the 2 modes are also
>> different.
>> If you can match the timings, as shown by fbset and xvidtune, this should
>> minimize the variation.
>>
> [snip]
>>
>> savagefb does save the initial registers and reuses part of them when
>> setting
>> the mode, so if you can boot with vga= parameter that matches the
>> initial mode
>> of savagefb, it might help. Try this:
>>
>> video=savagefb:1024x768-16@60 vga=0x317
>>
> 
> thanks for the hand holding.
> 
> Let me reiterate to make sure I understood correctly.
> 
> Let's concentrate in one mode because trying all the modes is very time
> consuming.
> Since I am interested mainly in 640x480-16@xx that means vga=0x311. That
> also
> means I shouldn't fiddle with SVGATextMode before loading the savagefb
> driver.
> Right now I am doing a lot of mode3; SVGATextMode -x to restore the
> console.
> 
> So I am booting with video=savagefb:640x480-16@60 vga=0x317 and prevent
> SVGATextMode from running.
> 
> Now for mode setting. I will run X, xvidtune, fetch the mode. I will use
> http://www.tldp.org/HOWTO/Framebuffer-HOWTO-18.html
> instructions to convert the mode to a line fbset understands. Then
> I will force my SDL test app to use the mode previously set by fbset
> and then I will run the savagedump to compare with the X dump.
> 
> I will try the procedure above ASAP and report back unless you have any
> objections in the methodology.

Much simpler if you just load X first with UseBIOS False then dump the regs.
Do the same with UseBIOS True.  You mentioned that X does not work if the
option UseBIOS is false.

Tony 


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