[U-Boot-Users] mkimage parameters for cramfs.img

[Wayne Lee]

For uClinux, there is a precious introduction written by David McCullough.
(http://www.linuxjournal.com/article/7221)
This article mentioned that the guaranteed (root) filesystem format subject
to uClinux constraints is romfs.

Of course, the romfs can be programmed into flash and be mounted by Linux
kernel MTD driver. 
On the other hand, romfs can be mounted in ramdisk way.

For the memory consumption comparison issue, your conclusion is right.
We also can find the explanation in section 8.1.2 of "Building Embedded
Linux Systems".

Thanks.
Wayne

-----Original Message-----
From: u-boot-users-admin at lists.sourceforge.net
[mailto:u-boot-users-admin at lists.sourceforge.net] On Behalf Of Wolfgang Denk
Sent: Friday, May 06, 2005 5:59 PM
To: Wayne Lee
Cc: 'u-boot-users'
Subject: Re: [U-Boot-Users] mkimage parameters for cramfs.img 

In message <200505060859.j468wv8R013906 at ismp.csie.ncku.edu.tw> you wrote:
> 
> After u-boot places the cramfs image to the expected location without
> wrapped by mkimage, the filesystem is mounted.

Then you know now that you have been passing bad addresses.

> (My uClinux port does not use MTD driver. Instead, it uses ramdisk driver
to
> load cramfs image to ram. Hence, I now use u-boot cp command to copy
cramfs
> image from flash to ram directly.)

Did you compare the memory consumption of this solution against using
a standard ramdisk? IMHO cramfs makes only sense when used in  a  MTD
flash partition (so that you only load the needed components to RAM);
when  you  load the whole image anyway your're usually more efficient
with a plain ramdisk.

> Originally, I hope to use mkimage to add header to cramfs image to gain
> crc32 check protection. 

You can do that, with a ramdisk image. Seems that in  your  case  the
address passed to the Linux kernel was wrong, though.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
As usual, this being a 1.3.x release, I haven't  even  compiled  this
kernel yet. So if it works, you should be doubly impressed.
      - Linus Torvalds in <199506181536.SAA10638 at keos.cs.Helsinki.FI>


-------------------------------------------------------
This SF.Net email is sponsored by: NEC IT Guy Games.
Get your fingers limbered up and give it your best shot. 4 great events, 4
opportunities to win big! Highest score wins.NEC IT Guy Games. Play to
win an NEC 61 plasma display. Visit http://www.necitguy.com/?r=20
_______________________________________________
U-Boot-Users mailing list
U-Boot-Users at lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/u-boot-users