Upgrading cramfs root file system while running (DENX wrote that is not possible)

Wolfgang Denk wd at denx.de
Sat Apr 22 02:55:48 EST 2006

In message <44485B3F.8080308 at orkun.us> you wrote:
> If your bootloader is U-Boot and you are using standard bootm command to 
> boot, U-Boot decompresses the initrd image to RAM before passing the 
> file system to Linux. So, you are not working with flash copy and 
> updating the flash copy is not a problem at all. This applies to ext2, 
> cramfs or squashfs based initrd.

But it makes no sense to use cramfs or squashfs on a ramdisk.
You *want* to run these directly from flash.
But then, of course, you need alternate images (or other tricks)
for full image updates.

[Single file updates can be done using overlay file systems; see  the
DULG for details.]

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
Just about every computer on the market today runs Unix,  except  the
Mac (and nobody cares about it).                   - Bill Joy 6/21/85

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