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/lib_powerpc/string.c

@@ -0,0 +1,91 @@
+/*
+ * (C) Copyright 2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+
+/*
+ * CPU test
+ * Load/store string instructions:	lswi, stswi, lswx, stswx
+ *
+ * Several consecutive bytes from a source memory buffer are loaded
+ * left to right into GPRs. After that, the bytes are stored
+ * from the GPRs into a target memory buffer. The contents
+ * of the source and target buffers are then compared.
+ */
+
+#include <post.h>
+#include "cpu_asm.h"
+
+#if CONFIG_POST & CONFIG_SYS_POST_CPU
+
+extern void cpu_post_exec_02 (ulong *code, ulong op1, ulong op2);
+extern void cpu_post_exec_04 (ulong *code, ulong op1, ulong op2, ulong op3,
+    ulong op4);
+
+#include <bedbug/regs.h>
+int cpu_post_test_string (void)
+{
+    int ret = 0;
+    unsigned int i;
+    int flag = disable_interrupts();
+
+    if (ret == 0)
+    {
+	char src [31], dst [31];
+
+	ulong code[] =
+	{
+	    ASM_LSWI(5, 3, 31),
+	    ASM_STSWI(5, 4, 31),
+	    ASM_BLR,
+	};
+
+	for (i = 0; i < sizeof(src); i ++)
+	{
+	    src[i] = (char) i;
+	    dst[i] = 0;
+	}
+
+	cpu_post_exec_02(code, (ulong)src, (ulong)dst);
+
+	ret = memcmp(src, dst, sizeof(dst)) == 0 ? 0 : -1;
+    }
+
+    if (ret == 0)
+    {
+	char src [95], dst [95];
+
+	ulong code[] =
+	{
+	    ASM_LSWX(8, 3, 5),
+	    ASM_STSWX(8, 4, 5),
+	    ASM_BLR,
+	};
+
+	for (i = 0; i < sizeof(src); i ++)
+	{
+	    src[i] = (char) i;
+	    dst[i] = 0;
+	}
+
+	cpu_post_exec_04(code, (ulong)src, (ulong)dst, 0, sizeof(src));
+
+	ret = memcmp(src, dst, sizeof(dst)) == 0 ? 0 : -1;
+    }
+
+    if (ret != 0)
+    {
+	post_log ("Error at string test !\n");
+    }
+
+    if (flag)
+	enable_interrupts();
+
+    return ret;
+}
+
+#endif