Add a command to read raw blocks from a partition
Sometimes data is on a block device and within a partition, but not in a
particular filesystem.
This commands permits reading raw data from a partition.
Signed-off-by: Kenneth Waters <kwaters@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/Makefile b/common/Makefile
index b3a6032..07a93d1 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -142,6 +142,7 @@
COBJS-y += cmd_pcmcia.o
COBJS-$(CONFIG_CMD_PORTIO) += cmd_portio.o
COBJS-$(CONFIG_CMD_PXE) += cmd_pxe.o
+COBJS-$(CONFIG_CMD_READ) += cmd_read.o
COBJS-$(CONFIG_CMD_REGINFO) += cmd_reginfo.o
COBJS-$(CONFIG_CMD_REISER) += cmd_reiser.o
COBJS-$(CONFIG_CMD_SATA) += cmd_sata.o
diff --git a/common/cmd_read.c b/common/cmd_read.c
new file mode 100644
index 0000000..f0fc9bf
--- /dev/null
+++ b/common/cmd_read.c
@@ -0,0 +1,81 @@
+/*
+ * 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 <part.h>
+
+int do_read(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ char *ep;
+ block_dev_desc_t *dev_desc = NULL;
+ int dev;
+ int part = 0;
+ disk_partition_t part_info;
+ ulong offset = 0u;
+ ulong limit = 0u;
+ void *addr;
+ uint blk;
+ uint cnt;
+
+ if (argc != 6) {
+ cmd_usage(cmdtp);
+ return 1;
+ }
+
+ dev = (int)simple_strtoul(argv[2], &ep, 16);
+ if (*ep) {
+ if (*ep != ':') {
+ printf("Invalid block device %s\n", argv[2]);
+ return 1;
+ }
+ part = (int)simple_strtoul(++ep, NULL, 16);
+ }
+
+ dev_desc = get_dev(argv[1], dev);
+ if (dev_desc == NULL) {
+ printf("Block device %s %d not supported\n", argv[1], dev);
+ return 1;
+ }
+
+ addr = (void *)simple_strtoul(argv[3], NULL, 16);
+ blk = simple_strtoul(argv[4], NULL, 16);
+ cnt = simple_strtoul(argv[5], NULL, 16);
+
+ if (part != 0) {
+ if (get_partition_info(dev_desc, part, &part_info)) {
+ printf("Cannot find partition %d\n", part);
+ return 1;
+ }
+ offset = part_info.start;
+ limit = part_info.size;
+ } else {
+ /* Largest address not available in block_dev_desc_t. */
+ limit = ~0;
+ }
+
+ if (cnt + blk > limit) {
+ printf("Read out of range\n");
+ return 1;
+ }
+
+ if (dev_desc->block_read(dev, offset + blk, cnt, addr) < 0) {
+ 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]> addr blk# cnt"
+);