bootctl: Initial experimentation

This provides a basic prototype for boot control.

Some documentation is in boot/bootctl/README.rst

cmd/Kconfig

@@ -317,6 +317,16 @@ config CMD_BOOTM_PRE_LOAD
 	 This stage allow to check or modify the image provided
 	 to the bootm command.
 
+config CMD_BOOTCTL
+	bool "bootctl"
+	depends on BOOTCTL
+	default y
+	help
+	  Provide information about the bootctl system, including access to
+	  drivers and other features.
+
+	  This command is not necessary for bootctl to work.
+
 config CMD_BOOTDEV
 	bool "bootdev"
 	depends on BOOTSTD

cmd/bootctl.c

@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * 'bootctl' command
+ *
+ * Copyright 2025 Canonical Ltd
+ * Written by Simon Glass <simon.glass@canonical.com>
+ */
+
+#include <bootctl.h>
+#include <command.h>
+#include <dm.h>
+
+static int do_bootctl_list(struct cmd_tbl *cmdtp, int flag, int argc,
+			   char *const argv[])
+{
+	struct udevice *dev;
+	struct uclass *uc;
+	int i;
+
+	printf("Seq  Name            Type            Description\n");
+	printf("---  --------------  --------------  --------------------\n");
+
+	i = 0;
+	uclass_id_foreach_dev(UCLASS_BOOTCTL, dev, uc) {
+		struct bootctl_uc_plat *ucp = dev_get_uclass_plat(dev);
+
+		printf("%3d  %-15.15s %-15.15s %s\n", i, dev->name,
+		       dev_get_uclass_name(dev), ucp->desc);
+		i++;
+	}
+
+	printf("---  --------------  --------------  --------------------\n");
+	printf("(%d driver%s)\n", i, i != 1 ? "s" : "");
+
+	return 0;
+}
+
+static int do_bootctl_run(struct cmd_tbl *cmdtp, int flag, int argc,
+			  char *const argv[])
+{
+	int ret;
+
+	ret = bootctl_run();
+	if (ret) {
+		printf("Boot failed (err=%dE)\n", ret);
+		return CMD_RET_FAILURE;
+	}
+
+	return 0;
+}
+
+U_BOOT_LONGHELP(bootctl,
+	"list      - list bootctl drivers\n"
+	"run      - run a boot");
+
+U_BOOT_CMD_WITH_SUBCMDS(bootctl, "Boot control", bootctl_help_text,
+	U_BOOT_SUBCMD_MKENT(list, 1, 1, do_bootctl_list),
+	U_BOOT_SUBCMD_MKENT(run, 1, 1, do_bootctl_run));