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/post/board/pdm360ng/coproc_com.c

@@ -0,0 +1,78 @@
+/*
+ * (C) Copyright 2010 DENX Software Engineering,
+ * Anatolij Gustschin, agust@denx.de.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/*
+ * Co-Processor communication POST
+ */
+#include <common.h>
+#include <post.h>
+#include <serial.h>
+
+/*
+ * Actually the termination sequence of the coprocessor
+ * commands is "\r\n" (CR LF), but here we use a side effect of
+ * the putc() routine of the serial driver which checks for LF
+ * and sends CR before sending LF. Therefore the termination
+ * sequence in the command below is only "\n".
+ * "alive" string is the coprocessor response for ping command
+ * and not a command, therefore it is terminated with "\r\n".
+ */
+char alive[] = "$AL;38\r\n";
+char ping[] = "$PI;2C\n";
+
+int coprocessor_post_test(int flags)
+{
+	struct stdio_dev *cop_port;
+	int ret;
+	char buf[10];
+
+	/* Test IO Coprocessor communication */
+	cop_port = open_port(4, CONFIG_SYS_PDM360NG_COPROC_BAUDRATE);
+	if (!cop_port)
+		return -1;
+
+	write_port(cop_port, ping);
+	udelay(CONFIG_SYS_PDM360NG_COPROC_READ_DELAY);
+
+	memset(buf, 0, sizeof(buf));
+	ret = read_port(cop_port, buf, sizeof(buf));
+	close_port(4);
+	if (ret <= 0) {
+		post_log("Error: Can't read IO Coprocessor port.\n");
+		return -1;
+	}
+
+	if (strcmp(buf, alive)) {
+		post_log("Error: IO-Cop. resp.: %s\n", buf);
+		return -1;
+	}
+
+	/* Test WD Coprocessor communication */
+	cop_port = open_port(1, CONFIG_SYS_PDM360NG_COPROC_BAUDRATE);
+	if (!cop_port) {
+		post_log("Error: Can't open WD Coprocessor port.\n");
+		return -1;
+	}
+
+	write_port(cop_port, ping);
+	udelay(CONFIG_SYS_PDM360NG_COPROC_READ_DELAY);
+
+	memset(buf, 0, sizeof(buf));
+	ret = read_port(cop_port, buf, sizeof(buf));
+	close_port(1);
+	if (ret <= 0) {
+		post_log("Error: Can't read WD Coprocessor port.\n");
+		return -1;
+	}
+
+	if (strcmp(buf, alive)) {
+		post_log("Error: WD-Cop. resp.: %s\n", buf);
+		return -1;
+	}
+
+	return 0;
+}