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/arch/arm/mach-kirkwood/cache.c

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2012 Michael Walle
+ * Michael Walle <michael@walle.cc>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <asm/arch/cpu.h>
+
+#define FEROCEON_EXTRA_FEATURE_L2C_EN (1<<22)
+
+void l2_cache_disable()
+{
+	u32 ctrl;
+
+	ctrl = readfr_extra_feature_reg();
+	ctrl &= ~FEROCEON_EXTRA_FEATURE_L2C_EN;
+	writefr_extra_feature_reg(ctrl);
+}