Intel 82854 GMCH - Manual (Page 17)

Intel® Digital Set Top Box Display Driver 17
User’s Guide for Microsoft* Windows* CE 5.0
4.1.3 Memory Management Options
The memory management options control memory management code.
[HKEY_LOCAL_MACHINE\Drivers\Display\Intel]
MaxFbSize <DWORD>
This key controls the size of the frame buffer in bytes.
830, 854: To compute the frame buffer size required for a given resolution, first compute the width in bytes using
the width * bytes per pixel. Then, if that isn't a power of two raise it to the next power of two to get the stride.
Finally, compute the total size as stride * height. For example:
• 720x480 @32bpp use “1E0000”
• 720x576 @32bpp use “240000”
• 1280x720 @32bpp use “5A0000”
• 720x480 @16bpp use “F0000”
• 720x576 @16bpp use “120000”
• 1920x1080 @ 32bpp use “870000”
MinVidSurfX <DWORD>
This key sets a minimum size in pixels for a video surface in the horizontal direction. The default minimum width is
16. Note: Do not set this lower than 16.
MinVidSurfY <DWORD>
This key sets a minimum size in lines for a video surface in the vertical direction. The default minimum height is 16.
Note: Do not set this key to less than 16.
PageReqLimit <DWORD>
This key limits the number of pages (each page holds 4096 bytes) that can be allocated for video memory. Note:
This field is typically not modified.
ReservedMemoryBase <DWORD>
This key is only used for static video memory configurations. It determines the location of video memory in the
system. This setting is commented out when using dynamic video memory.
ReservedMemorySize <DWORD>
This key is only used for static video memory configurations. It determines the size of video memory, which starts at
the location specified in the registry (ReservedMemoryBase). This setting is commented out when using dynamic
video memory.