🚀 go-pugleaf

Satcom2 wrote:
> 
> Does anyone know how to get the linear frame buffer to work on a cirrus
> logic VESA local bus card? I want to be able to speed up the frame rate on
> the Shinobi emulator and others,but when I install it (univbe 5.3) it says
> "note:due to a hardware problem,cirrus 542x boards cannot use linear
> framebuffer modes when more than 14mb of system memory is installed.Linear
> framebuffer disabled." Is there a way to trick my computer into thinking it
> has 14 mb? I have 36 mb installed currently.Any advice on this would be
> appreciated.-Satcom2

Although I have no details on the Cirrus chipset, my guess is that
linear access to the frame buffer is implemented by mapping the frame
buffer to the "empty" (hopefully) upper 2 Mbytes of the PC's first 16
Mbytes. However, if you have more than 14 Mbytes, this 2 Mbyte are is
not "empty", but instead is filled with actual memory. When an attempt
is made to switch the Cirrus chip to linear mode, the Cirrus driver
reports and illegal operation, as the expected "empty" address is
occupied with real memory, so there is no place to relocate the linear
frame buffer.

Just my guess, though.

***                                                                ***
*                 Paul Urbanus    u...@urbonix.com                    *
*                                                                    *
*   Never wrestle with a hog - you get dirty and the hog likes it.   *
***                                                                ***