Yes, you can create a disk image with dd and the partition in with fdisk and 
format it with mkfs.ext3.

Googling turned up this which seems to be a good example:
https://wiki.archlinux.org/index.php/Creating_Arch_Linux_disk_image

Ali

On Apr 29, 2014, at 1:00 PM, Fernando Endo <[email protected]> wrote:

> Hello,
> 
> If that's a python limitation, you could try to create an empty file using 
> the 'dd' command line in unix systems (something like 'dd if=/dev/zero 
> of=yourimage.img ...').
> 
> Regards,
> 
> --
> Fernando A. Endo, PhD student and researcher
> 
> Université de Grenoble, UJF
> France
> 
> 
> 
> 2014-04-29 2:43 GMT+02:00 Hao Wu <[email protected]>:
> Hi,
> 
> It seems util/gem5img.py can only create disk images at a maximum of ~8GB. Is 
> this a built-in limit for gem5? Does anyone know a way to create a large disk 
> image?
> 
> Thank you for any help!
> 
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