duplicate DoC millenium with dd

David Woodhouse dwmw2 at infradead.org
Tue Sep 11 17:23:46 EDT 2001

niko at isl.net.mx said:
>  ohh, so bad.... I will have to nftl_format every time I update my
> flash....  

Not at all - no more than you need to do a low level format of your hard 
drive every time you put a new filesystem on it. Just do the mkcramfs step 

> > What are you partitioning it for, btw?
> It's a firewall. I place linuxbios & kernel first, then I nftl_format
> /dev/mtd0 0xFIRST_FREE_BLOCK and place a minimal filesystem (cramfs)
> on the  rest of the chip.....

You nftl_format it with the offset, which gives you a block device /dev/
nftla. Then you use sfdisk rather than mkcramfs -o /dev/nftla. If you only 
have one partition, then a partition table is just a waste of space.

> since you say nftl_format removes
> original badblocks  table M-Systems put on the chip at fabrication
> time, I kinda dislike this  util..... 

It's now better than it was. And you shouldn't need to use it more than 
once, if the total size of your LinuxBIOS and kernel don't change (or if 
you left enough space for a little bit of expansion).

>  is there any way to avoid nftl_format and boot my cramfs from /dev/
> mtdblockX  or /dev/mtd0 with an 0xXXXX offset or something like this? 

Not out of the box. It's trivial to do that though, by using the mtd
version of partitions, which makes it look like two (or more) separate MTD


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