Instead of reserving video memory for 1024x768x16bits (1572864 bytes) this
allows up to 800x600x16bits, thereby saving half a meg of RAM.
In any case, 1024x768 only works without twitching at 8bpp.

Index: linux-2.6.36-simone/arch/arm/mach-ep93xx/simone.c
===================================================================
--- linux-2.6.36-simone.orig/arch/arm/mach-ep93xx/simone.c	2010-11-17 19:56:42.023092147 +0100
+++ linux-2.6.36-simone/arch/arm/mach-ep93xx/simone.c	2010-11-17 19:56:47.772072164 +0100
@@ -18,6 +18,7 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
+#include <linux/fb.h>
 #include <linux/mmc/host.h>
 #include <linux/gpio.h>
 #include <linux/spi/spi.h>
@@ -36,8 +37,50 @@
 	.phy_id		= 1,
 };
 
+/*
+ * FB support
+ * Standard modes copied from drivers/video/modedb.c
+ * Including 1024x768, which only works without twitching at 8bpp,
+ * exceeds the amount of available DMA memory when both USB-OHCI and AC97
+ * are enabled, so we go for 800x600 max.
+ */
+static const struct fb_videomode fb_modedb[] = {
+	{	/* 640x480 @ 60 Hz, 31.5 kHz hsync */
+		.name		= "CRT-VGA",
+		.refresh	= 60,
+		.xres		= 640,
+		.yres		= 480,
+		.pixclock	= 39721,
+		.left_margin	= 40,
+		.right_margin	= 24,
+		.upper_margin	= 32,
+		.lower_margin	= 11,
+		.hsync_len	= 96,
+		.vsync_len	= 2,
+		.sync		= 0,
+		.vmode		= FB_VMODE_NONINTERLACED,
+		.flag		= 0,
+	}, {/* 800x600 @ 60 Hz, 37.8 kHz hsync */
+		.name		= "CRT-SVGA",
+		.refresh	= 60,
+		.xres		= 800,
+		.yres		= 600,
+		.pixclock	= 25000,
+		.left_margin	= 888,
+		.right_margin	= 40,
+		.upper_margin	= 23,
+		.lower_margin	= 1,
+		.hsync_len	= 128,
+		.vsync_len	= 4,
+		.sync		= FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT,
+		.vmode		= FB_VMODE_NONINTERLACED,
+		.flag		= 0,
+	},
+};
+
 static struct ep93xxfb_mach_info __initdata simone_fb_info = {
-	.num_modes	= EP93XXFB_USE_MODEDB,
+	.modes		= fb_modedb,
+	.num_modes	= ARRAY_SIZE(fb_modedb),
 	.bpp		= 16,
 	.flags		= EP93XXFB_USE_SDCSN0 | EP93XXFB_PCLK_FALLING,
 };