diff --git a/drivers/video/sunxi_display.c b/drivers/video/sunxi_display.c
index f5f24fc..cd5963a 100644
--- a/drivers/video/sunxi_display.c
+++ b/drivers/video/sunxi_display.c
@@ -1060,6 +1060,11 @@ static const char *sunxi_get_mon_desc(enum sunxi_monitor monitor)
 	return NULL; /* never reached */
 }
 
+ulong board_get_usable_ram_top(ulong total_size)
+{
+	return gd->ram_top - CONFIG_SUNXI_MAX_FB_SIZE;
+}
+
 void *video_hw_init(void)
 {
 	static GraphicDevice *graphic_device = &sunxi_display.graphic_device;
@@ -1076,7 +1081,7 @@ void *video_hw_init(void)
 	memset(&sunxi_display, 0, sizeof(struct sunxi_display));
 
 	printf("Reserved %dkB of RAM for Framebuffer.\n",
-	       CONFIG_SUNXI_FB_SIZE >> 10);
+	       CONFIG_SUNXI_MAX_FB_SIZE >> 10);
 	gd->fb_base = gd->ram_top;
 
 	video_get_ctfb_res_modes(RES_MODE_1024x768, 24, &mode,
@@ -1194,6 +1199,7 @@ int sunxi_simplefb_setup(void *blob)
 {
 	static GraphicDevice *graphic_device = &sunxi_display.graphic_device;
 	int offset, ret;
+	u64 start, size;
 	const char *pipeline = NULL;
 
 #ifdef CONFIG_MACH_SUN4I
@@ -1237,6 +1243,20 @@ int sunxi_simplefb_setup(void *blob)
 		return 0; /* Keep older kernels working */
 	}
 
+	/*
+	 * Do not report the framebuffer as free RAM to the OS, note we cannot
+	 * use fdt_add_mem_rsv() here, because then it is still seen as RAM,
+	 * and e.g. Linux refuses to iomap RAM on ARM, see:
+	 * linux/arch/arm/mm/ioremap.c around line 301.
+	 */
+	start = gd->bd->bi_dram[0].start;
+	size = gd->bd->bi_dram[0].size - CONFIG_SUNXI_MAX_FB_SIZE;
+	ret = fdt_fixup_memory_banks(blob, &start, &size, 1);
+	if (ret) {
+		eprintf("Cannot setup simplefb: Error reserving memory\n");
+		return ret;
+	}
+
 	ret = fdt_setup_simplefb_node(blob, offset, gd->fb_base,
 			graphic_device->winSizeX, graphic_device->winSizeY,
 			graphic_device->winSizeX * graphic_device->gdfBytesPP,
diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h
index cea52db..33c0614 100644
--- a/include/configs/sunxi-common.h
+++ b/include/configs/sunxi-common.h
@@ -210,10 +210,10 @@
 
 #ifdef CONFIG_VIDEO
 /*
- * The amount of RAM that is reserved for the FB. This will not show up as
- * RAM to the kernel, but will be reclaimed by a KMS driver in future.
+ * The amount of RAM to keep free at the top of RAM when relocating u-boot,
+ * to use as framebuffer. This must be a multiple of 4096.
  */
-#define CONFIG_SUNXI_FB_SIZE (9 << 20)
+#define CONFIG_SUNXI_MAX_FB_SIZE (9 << 20)
 
 /* Do we want to initialize a simple FB? */
 #define CONFIG_VIDEO_DT_SIMPLEFB
@@ -231,8 +231,6 @@
 /* stop x86 thinking in cfbconsole from trying to init a pc keyboard */
 #define CONFIG_VGA_AS_SINGLE_DEVICE
 
-#define CONFIG_SYS_MEM_TOP_HIDE ((CONFIG_SUNXI_FB_SIZE + 0xFFF) & ~0xFFF)
-
 /* To be able to hook simplefb into dt */
 #ifdef CONFIG_VIDEO_DT_SIMPLEFB
 #define CONFIG_OF_BOARD_SETUP