- /* limit framebuffer size to 16 MB. Otherwise we'll eat tons of
- * kernel address space for nothing if the gfx card has alot of
- * memory (>= 128 MB isn't uncommon these days ...) */
- if (vesafb_fix.smem_len > 16 * 1024 * 1024)
- vesafb_fix.smem_len = 16 * 1024 * 1024;
+ /* size_vmode -- that is the amount of memory needed for the
+ * used video mode, i.e. the minimum amount of
+ * memory we need. */
+ size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
+
+ /* size_total -- all video memory we have. Used for mtrr
+ * entries, ressource allocation and bounds
+ * checking. */
+ size_total = screen_info.lfb_size * 65536;
+ if (vram_total)
+ size_total = vram_total * 1024 * 1024;
+ if (size_total < size_vmode)
+ size_total = size_vmode;
+
+ /* size_remap -- the amount of video memory we are going to
+ * use for vesafb. With modern cards it is no
+ * option to simply use size_total as that
+ * wastes plenty of kernel address space. */
+ size_remap = size_vmode * 2;
+ if (vram_remap)
+ size_remap = vram_remap * 1024 * 1024;
+ if (size_remap < size_vmode)
+ size_remap = size_vmode;
+ if (size_remap > size_total)
+ size_remap = size_total;
+ vesafb_fix.smem_len = size_remap;