avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/drivers/video/vesa_fb.c

@@ -0,0 +1,63 @@
+/*
+ * VESA frame buffer driver
+ *
+ * Copyright (C) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <pci_rom.h>
+#include <video_fb.h>
+#include <vbe.h>
+
+/*
+ * The Graphic Device
+ */
+GraphicDevice ctfb;
+
+void *video_hw_init(void)
+{
+	GraphicDevice *gdev = &ctfb;
+	struct udevice *dev;
+	int bits_per_pixel;
+	int ret;
+
+	printf("Video: ");
+	if (!ll_boot_init()) {
+		/*
+		 * If we are running from EFI or coreboot, this driver can't
+		 * work.
+		 */
+		printf("Not available (previous bootloader prevents it)\n");
+		return NULL;
+	}
+	if (vbe_get_video_info(gdev)) {
+		ret = dm_pci_find_class(PCI_CLASS_DISPLAY_VGA << 8, 0, &dev);
+		if (ret) {
+			printf("no card detected\n");
+			return NULL;
+		}
+		bootstage_start(BOOTSTAGE_ID_ACCUM_LCD, "vesa display");
+		ret = dm_pci_run_vga_bios(dev, NULL, PCI_ROM_USE_NATIVE |
+					  PCI_ROM_ALLOW_FALLBACK);
+		bootstage_accum(BOOTSTAGE_ID_ACCUM_LCD);
+		if (ret) {
+			printf("failed to run video BIOS: %d\n", ret);
+			return NULL;
+		}
+	}
+
+	if (vbe_get_video_info(gdev)) {
+		printf("No video mode configured\n");
+		return NULL;
+	}
+
+	bits_per_pixel = gdev->gdfBytesPP * 8;
+	sprintf(gdev->modeIdent, "%dx%dx%d", gdev->winSizeX, gdev->winSizeY,
+		bits_per_pixel);
+	printf("%s\n", gdev->modeIdent);
+	debug("Frame buffer at %x\n", gdev->pciBase);
+
+	return (void *)gdev;
+}