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

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Date:   Mon, 14 Aug 2017 17:11:53 +0000
From:   Chris Brandt <Chris.Brandt@...esas.com>
To:     Nicolas Pitre <nicolas.pitre@...aro.org>,
        Alexander Viro <viro@...iv.linux.org.uk>
CC:     "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-embedded@...r.kernel.org" <linux-embedded@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 0/5] cramfs refresh for embedded usage

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