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Reading and writing NAND flash with dd

I have an embedded device and I'd like to backup the NAND flash. From the openwrt wiki I gathered that dd is not a suitable option for dumping. You can use dd, but the dump will be garbled. However, ...
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integrity check of uboot using dd

I just upgraded uboot using dd and it boot successfully : dd if=uboot_file of=/dev/mmcblk0 bs=512 The output is : 1360+1 records in 1360+1 records out I would like to read backup to ensure every ...
3
votes
1answer
3k views

How to use dd if=/dev/mem in place of devmem ?

It seems like root@testbox:~# dd if=/dev/mem bs=1 count=4 skip=2149646336 | hd should be nearly equivalent to root@testbox:~# devmem 2149646336 32 But, while devmem works great, that dd invocation ...
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2answers
93 views

How to identify relevant parts of an ext4 partition

Background: I need to clone ext4 partitions from an eMMC using uboot (and if neccessary custom bare metal code). I copied the whole thing using mmc read and found that most of the partition is empty, ...
1
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1answer
4k views

Using dd command to download mtd block

How to use dd command to download mtd block from embedded Linux-based device? # cat /proc/mtd dev: size erasesize name ... mtd3: 003a0000 00010000 "DRTI2" I need download mtd3 block, so dd if=...
1
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2answers
1k views

live dd over a mounted read-only root partition

I'm trying to conceive a firmware update mechanism for a Linux-based embedded system without an additional initrd/initramfs/whatever. From within the running system, which has a read-only mounted root,...
4
votes
1answer
1k views

What does this dd command do exactly?

I have an embedded device with this SD card: [root@(none) ~]# busybox fdisk -l Disk /dev/mmcblk0: 3965 MB, 3965190144 bytes 4 heads, 16 sectors/track, 121008 cylinders Units = cylinders of 64 * 512 = ...