Re: Twister savagefb doesn't sync

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

Vassilis Virvilis wrote:
> Antonino A. Daplas wrote:
> 
>>
>> lspci -v -d 5333:8d04
>>
> OK I have done a lot of tests. First my device is
> 5333:8d01 and the non-prefetchable memory is at ec000000
> so we have
> 
> #define PCI_ID        0x8d01  /* put the PCI id of the device here */
> #define PCI_PBASE     0xec000000  /* put the start address of the PCI
> resource here */
> 
> Ok. I tried both X (with use bios), and SDL testsprite in 640x480,
> 800x600, 1024x768 at
> 8, 16, 24 bpp.
> 
> testsprite is a SDL demo that accepts the following options
> (-width, -height, -bpp). I made both sets of tests in a medion TFT 18
> screen and in an
> EIZO F520 CRT.
> 
> All X modes are working.
> SDL works for 1024x768 bpp=* in CRT and TFT
> SDL work in 800x600 bpp={16, 24} (not 8bpp) only in TFT and __not in CRT__
> 
> I am attaching the output of savagedump for all modes, for both monitors
> (#36),
> just for future reference.
> 
> I will try to understand the differences but the registers are too many
> and without
> documentation it is a bit hopeless I am afraid. Or is there

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.

> documentation somewhere publicly
> available?

There are no docs.

> 
> Is there any way to replay the working set of registers to get the
> correct mode settings?

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

Tony


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