RE: How to build an image for whole flash

["JohnsonCheng" <johnsoncheng@qnap.com.tw>]

Yes. I add a MTD partition which include whole flash as following:
mtd0: 0xFF000000-0xFF1FFFFF      Kernel
mtd1: 0xFF200000-0xFF9FFFFF      RootFS
mtd2: 0xFFA00000-0xFFAFFFFF      Config
mtd3: 0xFFF00000-0xFFFFFFFF      U-Boot
mtd4: 0xFF000000-0xFFFFFFFF      Flash

then "dd if=/dev/mtd4 of=flash.img".
Bu t I think it's not a good idea.

Thanks,
Johnson Cheng

-----Original Message-----
From: wd@denx.de [mailto:wd@denx.de] 
Sent: Thursday, August 25, 2005 3:29 PM
To: JohnsonCheng
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: How to build an image for whole flash 

In message <20050825032128.D90A368110@ozlabs.org> you wrote:
>
> My flash is 16M that is mapping on 0xFF000000-0xFFFFFFFF.
> mtd0: 0xFF000000-0xFF1FFFFF      Kernel
> mtd1: 0xFF200000-0xFF9FFFFF      RootFS
> mtd2: 0xFFA00000-0xFFAFFFFF       Config
> mtd3: 0xFFF00000-0xFFFFFFFF      U-Boot
> 
> Now I can build an image for mtd device, for example, dd if=/dev/mtd0
> of=kernel.img.

If you want to copy the image to flash, you got the parameters wrong,
i. e. you must use

	dd if=kernel.img of=/dev/mtd0

(after erasing /dev/mtd0, of course); and using some bs=  option  may
speed up the prcedure a bit, too.

> But I don't know how to build a image for whole flash ? 

What do you mean "for the whole flash"? If you cant to combine the  4
images  into  one big blob you can do so by (1) padding the images to
the full size of each partition; this can be done  using  appropriate
"bs=",   "count="   and   "conv=sync"   parameters  to  dd;  and  (2)
concatenating the images using "cat".

But this is a prtty inefficient way, and you will also have to change
your MTD partitioning to provide a big  partition  which  covers  the
whole flash.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
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