@@ -14,6 +14,25 @@ config DM_VIDEO
option compiles in the video uclass and routes all LCD/video access
through this.
+config VIDEO_PCI_DEFAULT_FB_SIZE
+ hex "Default framebuffer size to use if no drivers request it"
+ depends on DM_VIDEO
+ default 0x1000000 if X86 && PCI
+ default 0 if !(X86 && PCI)
+ help
+ Generally, video drivers request the amount of memory they need for
+ the frame buffer when they are bound, by setting the size field in
+ struct video_uc_platdata. That memory is then reserved for use after
+ relocation. But PCI drivers cannot be bound before relocation unless
+ they are mentioned in the devicetree.
+
+ With this value set appropriately, it is possible for PCI video
+ devices to have a framebuffer allocated by U-Boot.
+
+ Note: the framebuffer needs to be large enough to store all pixels at
+ maximum resolution. For example, at 1920 x 1200 with 32 bits per
+ pixel, 2560 * 1600 * 32 / 8 = 0xfa0000 bytes are needed.
+
config VIDEO_COPY
bool "Enable copying the frame buffer to a hardware copy"
depends on DM_VIDEO
@@ -97,6 +97,11 @@ int video_reserve(ulong *addrp)
debug("%s: Reserving %lx bytes at %lx for video device '%s'\n",
__func__, size, *addrp, dev->name);
}
+
+ /* Allocate space for PCI video devices in case there were not bound */
+ if (*addrp == gd->video_top)
+ *addrp -= CONFIG_VIDEO_PCI_DEFAULT_FB_SIZE;
+
gd->video_bottom = *addrp;
debug("Video frame buffers from %lx to %lx\n", gd->video_bottom,
gd->video_top);