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/watchdog/xilinx_tb_wdt.c

@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2011-2013 Xilinx Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/microblaze_intc.h>
+#include <asm/processor.h>
+#include <watchdog.h>
+
+#define XWT_CSR0_WRS_MASK	0x00000008 /* Reset status Mask */
+#define XWT_CSR0_WDS_MASK	0x00000004 /* Timer state Mask */
+#define XWT_CSR0_EWDT1_MASK	0x00000002 /* Enable bit 1 Mask*/
+#define XWT_CSRX_EWDT2_MASK	0x00000001 /* Enable bit 2 Mask */
+
+struct watchdog_regs {
+	u32 twcsr0; /* 0x0 */
+	u32 twcsr1; /* 0x4 */
+	u32 tbr; /* 0x8 */
+};
+
+static struct watchdog_regs *watchdog_base =
+			(struct watchdog_regs *)CONFIG_WATCHDOG_BASEADDR;
+
+void hw_watchdog_reset(void)
+{
+	u32 reg;
+
+	/* Read the current contents of TCSR0 */
+	reg = readl(&watchdog_base->twcsr0);
+
+	/* Clear the watchdog WDS bit */
+	if (reg & (XWT_CSR0_EWDT1_MASK | XWT_CSRX_EWDT2_MASK))
+		writel(reg | XWT_CSR0_WDS_MASK, &watchdog_base->twcsr0);
+}
+
+void hw_watchdog_disable(void)
+{
+	u32 reg;
+
+	/* Read the current contents of TCSR0 */
+	reg = readl(&watchdog_base->twcsr0);
+
+	writel(reg & ~XWT_CSR0_EWDT1_MASK, &watchdog_base->twcsr0);
+	writel(~XWT_CSRX_EWDT2_MASK, &watchdog_base->twcsr1);
+
+	puts("Watchdog disabled!\n");
+}
+
+static void hw_watchdog_isr(void *arg)
+{
+	hw_watchdog_reset();
+}
+
+void hw_watchdog_init(void)
+{
+	int ret;
+
+	writel((XWT_CSR0_WRS_MASK | XWT_CSR0_WDS_MASK | XWT_CSR0_EWDT1_MASK),
+	       &watchdog_base->twcsr0);
+	writel(XWT_CSRX_EWDT2_MASK, &watchdog_base->twcsr1);
+
+	ret = install_interrupt_handler(CONFIG_WATCHDOG_IRQ,
+						hw_watchdog_isr, NULL);
+	if (ret)
+		puts("Watchdog IRQ registration failed.");
+}