u-boot/cmd/read.c

/*
 * Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 */

#include <common.h>
#include <command.h>
#include <mapmem.h>
#include <part.h>

int do_read(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
	struct blk_desc *dev_desc = NULL;
	struct disk_partition part_info;
	ulong offset, limit;
	void *addr;
	uint blk;
	uint cnt;
	int part;

	if (argc != 6) {
		cmd_usage(cmdtp);
		return 1;
	}

	part = part_get_info_by_dev_and_name_or_num(argv[1], argv[2],
						    &dev_desc, &part_info, 1);
	if (part < 0)
		return 1;

	addr = map_sysmem(hextoul(argv[3], NULL), 0);
	blk = hextoul(argv[4], NULL);
	cnt = hextoul(argv[5], NULL);

	if (part > 0) {
		offset = part_info.start;
		limit = part_info.size;
	} else {
		/* Largest address not available in struct blk_desc. */
		offset = 0;
		limit = ~0;
	}

	if (cnt + blk > limit) {
		printf("Read out of range\n");
		return 1;
	}

	if (blk_dread(dev_desc, offset + blk, cnt, addr) != cnt) {
		printf("Error reading blocks\n");
		return 1;
	}

	return 0;
}

U_BOOT_CMD(
	read,	6,	0,	do_read,
	"Load binary data from a partition",
	"<interface> <dev[:part|#partname]> addr blk# cnt"
);