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/serial/arm_dcc.c

@@ -0,0 +1,176 @@
+/*
+ * Copyright (C) 2004-2007 ARM Limited.
+ * Copyright (C) 2008 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ * Copyright (C) 2015 - 2016 Xilinx, Inc, Michal Simek
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ *
+ * As a special exception, if other files instantiate templates or use macros
+ * or inline functions from this file, or you compile this file and link it
+ * with other works to produce a work based on this file, this file does not
+ * by itself cause the resulting work to be covered by the GNU General Public
+ * License. However the source code for this file must still be made available
+ * in accordance with section (3) of the GNU General Public License.
+
+ * This exception does not invalidate any other reasons why a work based on
+ * this file might be covered by the GNU General Public License.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <serial.h>
+
+#if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V7)
+/*
+ * ARMV6 & ARMV7
+ */
+#define DCC_RBIT	(1 << 30)
+#define DCC_WBIT	(1 << 29)
+
+#define write_dcc(x)	\
+		__asm__ volatile ("mcr p14, 0, %0, c0, c5, 0\n" : : "r" (x))
+
+#define read_dcc(x)	\
+		__asm__ volatile ("mrc p14, 0, %0, c0, c5, 0\n" : "=r" (x))
+
+#define status_dcc(x)	\
+		__asm__ volatile ("mrc p14, 0, %0, c0, c1, 0\n" : "=r" (x))
+
+#elif defined(CONFIG_CPU_XSCALE)
+/*
+ * XSCALE
+ */
+#define DCC_RBIT	(1 << 31)
+#define DCC_WBIT	(1 << 28)
+
+#define write_dcc(x)	\
+		__asm__ volatile ("mcr p14, 0, %0, c8, c0, 0\n" : : "r" (x))
+
+#define read_dcc(x)	\
+		__asm__ volatile ("mrc p14, 0, %0, c9, c0, 0\n" : "=r" (x))
+
+#define status_dcc(x)	\
+		__asm__ volatile ("mrc p14, 0, %0, c14, c0, 0\n" : "=r" (x))
+
+#elif defined(CONFIG_CPU_ARMV8)
+/*
+ * ARMV8
+ */
+#define DCC_RBIT	(1 << 30)
+#define DCC_WBIT	(1 << 29)
+
+#define write_dcc(x)   \
+		__asm__ volatile ("msr dbgdtrtx_el0, %0\n" : : "r" (x))
+
+#define read_dcc(x)    \
+		__asm__ volatile ("mrs %0, dbgdtrrx_el0\n" : "=r" (x))
+
+#define status_dcc(x)  \
+		__asm__ volatile ("mrs %0, mdccsr_el0\n" : "=r" (x))
+
+#else
+#define DCC_RBIT	(1 << 0)
+#define DCC_WBIT	(1 << 1)
+
+#define write_dcc(x)	\
+		__asm__ volatile ("mcr p14, 0, %0, c1, c0, 0\n" : : "r" (x))
+
+#define read_dcc(x)	\
+		__asm__ volatile ("mrc p14, 0, %0, c1, c0, 0\n" : "=r" (x))
+
+#define status_dcc(x)	\
+		__asm__ volatile ("mrc p14, 0, %0, c0, c0, 0\n" : "=r" (x))
+
+#endif
+
+#define can_read_dcc(x)	do {	\
+		status_dcc(x);	\
+		x &= DCC_RBIT;	\
+		} while (0);
+
+#define can_write_dcc(x) do {	\
+		status_dcc(x);	\
+		x &= DCC_WBIT;	\
+		x = (x == 0);	\
+		} while (0);
+
+#define TIMEOUT_COUNT 0x4000000
+
+static int arm_dcc_getc(struct udevice *dev)
+{
+	int ch;
+	register unsigned int reg;
+
+	do {
+		can_read_dcc(reg);
+	} while (!reg);
+	read_dcc(ch);
+
+	return ch;
+}
+
+static int arm_dcc_putc(struct udevice *dev, char ch)
+{
+	register unsigned int reg;
+	unsigned int timeout_count = TIMEOUT_COUNT;
+
+	while (--timeout_count) {
+		can_write_dcc(reg);
+		if (reg)
+			break;
+	}
+	if (timeout_count == 0)
+		return -EAGAIN;
+	else
+		write_dcc(ch);
+
+	return 0;
+}
+
+static int arm_dcc_pending(struct udevice *dev, bool input)
+{
+	register unsigned int reg;
+
+	if (input) {
+		can_read_dcc(reg);
+	} else {
+		can_write_dcc(reg);
+	}
+
+	return reg;
+}
+
+static const struct dm_serial_ops arm_dcc_ops = {
+	.putc = arm_dcc_putc,
+	.pending = arm_dcc_pending,
+	.getc = arm_dcc_getc,
+};
+
+static const struct udevice_id arm_dcc_ids[] = {
+	{ .compatible = "arm,dcc", },
+	{ }
+};
+
+U_BOOT_DRIVER(serial_dcc) = {
+	.name	= "arm_dcc",
+	.id	= UCLASS_SERIAL,
+	.of_match = arm_dcc_ids,
+	.ops	= &arm_dcc_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};
+
+#ifdef CONFIG_DEBUG_UART_ARM_DCC
+
+#include <debug_uart.h>
+
+static inline void _debug_uart_init(void)
+{
+}
+
+static inline void _debug_uart_putc(int ch)
+{
+	arm_dcc_putc(NULL, ch);
+}
+
+DEBUG_UART_FUNCS
+#endif