openwrt生成固件(dd命令)

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本文介绍了如何使用dd命令在OpenWRT系统中进行分区查看和固件生成。通过查看OpenWRT的分区情况，了解可用磁盘空间，然后详细阐述了将kernel和rootfs全盘拷贝至/tmp路径生成fw.bin固件文件的过程。

一、基本操作

1、分区查看

查看openwrt分区

root@OpenWrt:/# dmesg
[    0.394554] m25p80 spi0.0: w25q256 (32768 Kbytes)
[    0.399584] 4 fixed-partitions partitions found on MTD device spi0.0
[    0.406029] Creating 4 MTD partitions on "spi0.0":
[    0.411013] 0x000000000000-0x000000030000 : "u-boot"
[    0.417681] 0x000000030000-0x000000040000 : "u-boot-env"
[    0.425217] 0x000000040000-0x000000050000 : "factory"
[    0.432544] 0x000000050000-0x000002000000 : "firmware"
[    0.440112] 2 uimage-fw partitions found on MTD device firmware
[    0.446129] Creating 2 MTD partitions on "firmware":
[    0.451734] 0x000000000000-0x00000018f368 : "kernel"
[    0.458367] 0x00000018f368-0x000001fb0000 : "rootfs"
[    0.465553] mtd: device 5 (rootfs) set to be root filesystem
[    0.471945] 1 squashfs-split partitions found on MTD device rootfs
[    0.478239] 0x0000005e0000-0x000001fb0000 : "rootfs_data"
[    0.487804] libphy: Fixed MDIO Bus: probed

root@OpenWrt:/# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00030000 00010000 "u-boot"
mtd1: 00010000 00010000 "u-boot-env"
mtd2: 00010000 00010000 "factory"
mtd3: 01fb0000 00010000 "firmware"
mtd4: 0018f368 00010000 "kernel"
mtd5: 01e20c98 00010000 "rootfs"
mtd6: 019d0000 00010000 "rootfs_data"

查看磁盘空间上可使用的空间大小

root@OpenWrt:/# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                 4.5M      4.5M         0 100% /rom
tmpfs                    60.9M     31.7M     29.1M  52% /tmp
/dev/mtdblock6           25.8M    948.0K     24.9M   4% /overlay
overlayfs:/overlay       25.8M    948.0K     24.9M   4% /
tmpfs                   512.0K         0    512.0K   0% /dev
/dev/mmcblk0p1           28.8G    320.0K     28.8G   0% /root/sd

这里将kernel和rootfs 全盘拷贝到/tmp路径下生成fw.bin

root@OpenWrt:/# dd if=/dev/mtd3 of=/tmp/fw.bin
64896+0 records in
64896+0 records out