cmd: add command "android_print_hdr" support

This is useful for debug.

Change-Id: I6e56255d6e32e692031c6c3226d0dc041433dd48
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>

cmd/Makefile

@@ -24,7 +24,7 @@ obj-$(CONFIG_CMD_BDI) += bdinfo.o
 obj-$(CONFIG_CMD_BEDBUG) += bedbug.o
 obj-$(CONFIG_CMD_BLOCK_CACHE) += blkcache.o
 obj-$(CONFIG_CMD_BMP) += bmp.o
-obj-$(CONFIG_CMD_BOOT_ANDROID) += boot_android.o
+obj-$(CONFIG_CMD_BOOT_ANDROID) += boot_android.o android.o
 obj-$(CONFIG_CMD_BOOT_ROCKCHIP) += bootrkp.o
 obj-$(CONFIG_CMD_BOOTEFI) += bootefi.o
 obj-$(CONFIG_CMD_BOOTMENU) += bootmenu.o

cmd/android.c

@@ -0,0 +1,69 @@
+/*
+ * (C) Copyright 2019 Rockchip Electronics Co., Ltd
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <android_image.h>
+#include <blk.h>
+#include <boot_rkimg.h>
+#include <command.h>
+#include <malloc.h>
+
+static int do_android_print_hdr(cmd_tbl_t *cmdtp, int flag,
+				int argc, char * const argv[])
+{
+	struct blk_desc *dev_desc;
+	struct andr_img_hdr *hdr;
+	disk_partition_t part_info;
+	const char *part_name;
+	int blkcnt, ret;
+
+	if (argc != 2)
+		return CMD_RET_USAGE;
+
+	part_name = argv[1];
+
+	dev_desc = rockchip_get_bootdev();
+	if (!dev_desc) {
+		printf("dev_desc is NULL!\n");
+		return -ENODEV;
+	}
+
+	ret = part_get_info_by_name(dev_desc, part_name, &part_info);
+	if (ret < 0) {
+		printf("Failed to get \"%s\" part, ret=%d\n", part_name, ret);
+		return -ENODEV;
+	}
+
+	hdr = memalign(ARCH_DMA_MINALIGN, sizeof(*hdr));
+	if (!hdr) {
+		printf("%s: out of memory!\n", __func__);
+		return -ENOMEM;
+	}
+
+	blkcnt = sizeof(*hdr) / dev_desc->blksz;
+	ret = blk_dread(dev_desc, part_info.start, blkcnt, hdr);
+	if (ret != blkcnt) {
+		printf("Failed to read %s sector, ret=%d\n", part_info.name, ret);
+		free(hdr);
+		return -EIO;
+	}
+
+	if (!android_image_check_header(hdr)) {
+		printf("Partition \"%s\"\n", part_info.name);
+		android_print_contents(hdr);
+	} else {
+		printf("Not an android image\n");
+	}
+
+	free(hdr);
+
+	return 0;
+}
+
+U_BOOT_CMD(
+	android_print_hdr, 2, 1, do_android_print_hdr,
+	"print android image header", "<partition name>"
+);