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/cpu/ppc4xx/ocm.c

@@ -0,0 +1,73 @@
+/*
+ * (C) Copyright 2008 Ilya Yanok, EmCraft Systems, yanok@emcraft.com
+ *
+ * Developed for DENX Software Engineering GmbH
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+
+/*
+ * This test attempts to verify on-chip memory (OCM). Result is written
+ * to the scratch register and if test succeed it won't be run till next
+ * power on.
+ */
+
+#include <post.h>
+
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define OCM_TEST_PATTERN1	0x55555555
+#define OCM_TEST_PATTERN2	0xAAAAAAAA
+
+#if CONFIG_POST & CONFIG_SYS_POST_OCM
+
+static uint ocm_status_read(void)
+{
+	return in_be32((void *)CONFIG_SYS_OCM_STATUS_ADDR) &
+		CONFIG_SYS_OCM_STATUS_MASK;
+}
+
+static void ocm_status_write(uint value)
+{
+	out_be32((void *)CONFIG_SYS_OCM_STATUS_ADDR, value |
+		(in_be32((void *)CONFIG_SYS_OCM_STATUS_ADDR) &
+			~CONFIG_SYS_OCM_STATUS_MASK));
+}
+
+static inline int ocm_test_word(uint value, uint *address)
+{
+	uint read_value;
+
+	*address = value;
+	sync();
+	read_value = *address;
+
+	return (read_value != value);
+}
+
+int ocm_post_test(int flags)
+{
+	uint   old_value;
+	int    ret = 0;
+	uint  *address = (uint*)CONFIG_SYS_OCM_BASE;
+
+	if (ocm_status_read() == CONFIG_SYS_OCM_STATUS_OK)
+		return 0;
+	for (; address < (uint*)(CONFIG_SYS_OCM_BASE + CONFIG_SYS_OCM_SIZE); address++) {
+		old_value = *address;
+		if (ocm_test_word(OCM_TEST_PATTERN1, address) ||
+				ocm_test_word(OCM_TEST_PATTERN2, address)) {
+			ret = 1;
+			*address = old_value;
+			printf("OCM POST failed at %p!\n", address);
+			break;
+		}
+		*address = old_value;
+	}
+	ocm_status_write(ret ? CONFIG_SYS_OCM_STATUS_FAIL : CONFIG_SYS_OCM_STATUS_OK);
+	return ret;
+}
+#endif /* CONFIG_POST & CONFIG_SYS_POST_OCM */