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/cache.c

@@ -0,0 +1,106 @@
+/*
+ * (C) Copyright 2007
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * Author: Igor Lisitsin <igor@emcraft.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+
+/* Cache test
+ *
+ * This test verifies the CPU data and instruction cache using
+ * several test scenarios.
+ */
+
+#include <post.h>
+
+#if CONFIG_POST & CONFIG_SYS_POST_CACHE
+
+#include <asm/mmu.h>
+#include <watchdog.h>
+
+#define CACHE_POST_SIZE	1024
+
+int cache_post_test1 (int tlb, void *p, int size);
+int cache_post_test2 (int tlb, void *p, int size);
+int cache_post_test3 (int tlb, void *p, int size);
+int cache_post_test4 (int tlb, void *p, int size);
+int cache_post_test5 (int tlb, void *p, int size);
+int cache_post_test6 (int tlb, void *p, int size);
+
+#ifdef CONFIG_440
+static unsigned char testarea[CACHE_POST_SIZE]
+__attribute__((__aligned__(CACHE_POST_SIZE)));
+#endif
+
+int cache_post_test (int flags)
+{
+	void *virt = (void *)CONFIG_SYS_POST_CACHE_ADDR;
+	int ints;
+	int res = 0;
+	int tlb = -1;		/* index to the victim TLB entry */
+
+	/*
+	 * All 44x variants deal with cache management differently
+	 * because they have the address translation always enabled.
+	 * The 40x ppc's don't use address translation in U-Boot at all,
+	 * so we have to distinguish here between 40x and 44x.
+	 */
+#ifdef CONFIG_440
+	int word0, i;
+
+	/*
+	 * Allocate a new TLB entry, since we are going to modify
+	 * the write-through and caching inhibited storage attributes.
+	 */
+	program_tlb((u32)testarea, (u32)virt, CACHE_POST_SIZE,
+		    TLB_WORD2_I_ENABLE);
+
+	/* Find the TLB entry */
+	for (i = 0;; i++) {
+		if (i >= PPC4XX_TLB_SIZE) {
+			printf ("Failed to program tlb entry\n");
+			return -1;
+		}
+		word0 = mftlb1(i);
+		if (TLB_WORD0_EPN_DECODE(word0) == (u32)virt) {
+			tlb = i;
+			break;
+		}
+	}
+#endif
+	ints = disable_interrupts ();
+
+	WATCHDOG_RESET ();
+	if (res == 0)
+		res = cache_post_test1 (tlb, virt, CACHE_POST_SIZE);
+	WATCHDOG_RESET ();
+	if (res == 0)
+		res = cache_post_test2 (tlb, virt, CACHE_POST_SIZE);
+	WATCHDOG_RESET ();
+	if (res == 0)
+		res = cache_post_test3 (tlb, virt, CACHE_POST_SIZE);
+	WATCHDOG_RESET ();
+	if (res == 0)
+		res = cache_post_test4 (tlb, virt, CACHE_POST_SIZE);
+	WATCHDOG_RESET ();
+	if (res == 0)
+		res = cache_post_test5 (tlb, virt, CACHE_POST_SIZE);
+	WATCHDOG_RESET ();
+	if (res == 0)
+		res = cache_post_test6 (tlb, virt, CACHE_POST_SIZE);
+
+	if (ints)
+		enable_interrupts ();
+
+#ifdef CONFIG_440
+	remove_tlb((u32)virt, CACHE_POST_SIZE);
+#endif
+
+	return res;
+}
+
+#endif /* CONFIG_POST & CONFIG_SYS_POST_CACHE */