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/misc/winbond_w83627.c

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2016 Stefan Roese <sr@denx.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/pnp_def.h>
+
+#define WINBOND_ENTRY_KEY	0x87
+#define WINBOND_EXIT_KEY	0xaa
+
+/* Enable configuration: pass entry key '0x87' into index port dev twice */
+static void pnp_enter_conf_state(u16 dev)
+{
+	u16 port = dev >> 8;
+
+	outb(WINBOND_ENTRY_KEY, port);
+	outb(WINBOND_ENTRY_KEY, port);
+}
+
+/* Disable configuration: pass exit key '0xAA' into index port dev */
+static void pnp_exit_conf_state(u16 dev)
+{
+	u16 port = dev >> 8;
+
+	outb(WINBOND_EXIT_KEY, port);
+}
+
+/* Bring up early serial debugging output before the RAM is initialized */
+void winbond_enable_serial(uint dev, uint iobase, uint irq)
+{
+	pnp_enter_conf_state(dev);
+	pnp_set_logical_device(dev);
+	pnp_set_enable(dev, 0);
+	pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
+	pnp_set_irq(dev, PNP_IDX_IRQ0, irq);
+	pnp_set_enable(dev, 1);
+	pnp_exit_conf_state(dev);
+}