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/cmd/cpu.c

@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <cpu.h>
+#include <dm.h>
+#include <errno.h>
+
+static const char *cpu_feature_name[CPU_FEAT_COUNT] = {
+	"L1 cache",
+	"MMU",
+	"Microcode",
+};
+
+static int print_cpu_list(bool detail)
+{
+	struct udevice *dev;
+	struct uclass *uc;
+	char buf[100];
+	int ret;
+
+	ret = uclass_get(UCLASS_CPU, &uc);
+	if (ret) {
+		printf("Cannot find CPU uclass\n");
+		return ret;
+	}
+	uclass_foreach_dev(dev, uc) {
+		struct cpu_platdata *plat = dev_get_parent_platdata(dev);
+		struct cpu_info info;
+		bool first;
+		int i;
+
+		ret = cpu_get_desc(dev, buf, sizeof(buf));
+		printf("%3d: %-10s %s\n", dev->seq, dev->name,
+		       ret ? "<no description>" : buf);
+		if (!detail)
+			continue;
+		ret = cpu_get_info(dev, &info);
+		if (ret) {
+			printf("\t(no detail available");
+			if (ret != -ENOSYS)
+				printf(": err=%d\n", ret);
+			printf(")\n");
+			continue;
+		}
+		printf("\tID = %d, freq = ", plat->cpu_id);
+		print_freq(info.cpu_freq, "");
+		first = true;
+		for (i = 0; i < CPU_FEAT_COUNT; i++) {
+			if (info.features & (1 << i)) {
+				printf("%s%s", first ? ": " : ", ",
+				       cpu_feature_name[i]);
+				first = false;
+			}
+		}
+		printf("\n");
+		if (info.features & (1 << CPU_FEAT_UCODE)) {
+			printf("\tMicrocode version %#x\n",
+			       plat->ucode_version);
+		}
+		if (info.features & (1 << CPU_FEAT_DEVICE_ID))
+			printf("\tDevice ID %#lx\n", plat->device_id);
+	}
+
+	return 0;
+}
+
+static int do_cpu_list(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+	if (print_cpu_list(false))
+		return CMD_RET_FAILURE;
+
+	return 0;
+}
+
+static int do_cpu_detail(cmd_tbl_t *cmdtp, int flag, int argc,
+			 char *const argv[])
+{
+	if (print_cpu_list(true))
+		return CMD_RET_FAILURE;
+
+	return 0;
+}
+
+static cmd_tbl_t cmd_cpu_sub[] = {
+	U_BOOT_CMD_MKENT(list, 2, 1, do_cpu_list, "", ""),
+	U_BOOT_CMD_MKENT(detail, 4, 0, do_cpu_detail, "", ""),
+};
+
+/*
+ * Process a cpu sub-command
+ */
+static int do_cpu(cmd_tbl_t *cmdtp, int flag, int argc,
+		       char * const argv[])
+{
+	cmd_tbl_t *c = NULL;
+
+	/* Strip off leading 'cpu' command argument */
+	argc--;
+	argv++;
+
+	if (argc)
+		c = find_cmd_tbl(argv[0], cmd_cpu_sub, ARRAY_SIZE(cmd_cpu_sub));
+
+	if (c)
+		return c->cmd(cmdtp, flag, argc, argv);
+	else
+		return CMD_RET_USAGE;
+}
+
+U_BOOT_CMD(
+	cpu, 2, 1, do_cpu,
+	"display information about CPUs",
+	"list	- list available CPUs\n"
+	"cpu detail	- show CPU detail"
+);