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/board/intel/galileo/galileo.c

@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/device.h>
+#include <asm/arch/quark.h>
+
+int board_early_init_f(void)
+{
+	return 0;
+}
+
+/*
+ * Intel Galileo gen2 board uses GPIO Resume Well bank pin0 as the PERST# pin.
+ *
+ * We cannot use any public GPIO APIs in <asm-generic/gpio.h> to control this
+ * pin, as these APIs will eventually call into gpio_ich6_ofdata_to_platdata()
+ * in the Intel ICH6 GPIO driver where it calls PCI configuration space access
+ * APIs which will trigger PCI enumeration process.
+ *
+ * Check <asm/arch-quark/quark.h> for more details.
+ */
+void board_assert_perst(void)
+{
+	u32 base, port, val;
+
+	/* retrieve the GPIO IO base */
+	qrk_pci_read_config_dword(QUARK_LEGACY_BRIDGE, LB_GBA, &base);
+	base = (base & 0xffff) & ~0x7f;
+
+	/* enable the pin */
+	port = base + 0x20;
+	val = inl(port);
+	val |= (1 << 0);
+	outl(val, port);
+
+	/* configure the pin as output */
+	port = base + 0x24;
+	val = inl(port);
+	val &= ~(1 << 0);
+	outl(val, port);
+
+	/* pull it down (assert) */
+	port = base + 0x28;
+	val = inl(port);
+	val &= ~(1 << 0);
+	outl(val, port);
+}
+
+void board_deassert_perst(void)
+{
+	u32 base, port, val;
+
+	/* retrieve the GPIO IO base */
+	qrk_pci_read_config_dword(QUARK_LEGACY_BRIDGE, LB_GBA, &base);
+	base = (base & 0xffff) & ~0x7f;
+
+	/* pull it up (de-assert) */
+	port = base + 0x28;
+	val = inl(port);
+	val |= (1 << 0);
+	outl(val, port);
+}