RE: [PATCH 0/5] cramfs refresh for embedded usage

[Chris Brandt]

On Friday, August 11, 2017, Nicolas Pitre wrote:
> This series brings a nice refresh to the cramfs filesystem, adding the
> following capabilities:
> 
> - Direct memory access, bypassing the block and/or MTD layers entirely.
> 
> - Ability to store individual data blocks uncompressed.
> 
> - Ability to locate individual data blocks anywhere in the filesystem.
> 
> The end result is a very tight filesystem that can be accessed directly
> from ROM without any other subsystem underneath. Also this allows for
> user space XIP which is a very important feature for tiny embedded
> systems.



I just applied the patches tried this simple test:
 - tested with a Renesas RZ/A1 (Cortex-A9...so it has an MMU).
 - I set the sticky bit for busybox before using mkcramfs
 - booted (with squashfs) and mounted the cramfs image
 - confirmed that the sticky bit was still set on busybox
 - was able to execute busybox in the cramfs image


However, at this point I'm not sure how I can confirm that the XIP 
busybox actually executed as XIP or not.


Chris