Re: [Buildroot] [RFC PATCH 1/2] support/scripts/genimage.sh: support creating a bmap image

From: Thomas Petazzoni via buildroot <buildroot@buildroot.org>
To: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Dario Binacchi <dario.binacchi@amarulasolutions.com>,
	Xuanhao Shi <X15000177@gmail.com>,
	buildroot@buildroot.org, Romain Naour <romain.naour@smile.fr>,
	Michael Nazzareno Trimarchi <michael@amarulasolutions.com>,
	linux-amarula@amarulasolutions.com,
	Anand Gadiyar <gadiyar@ti.com>
Subject: Re: [Buildroot] [RFC PATCH 1/2] support/scripts/genimage.sh: support creating a bmap image
Date: Fri, 31 May 2024 11:47:30 +0200	[thread overview]
Message-ID: <20240531114730.61f9f0fb@windsurf> (raw)
In-Reply-To: <ZkzdeFeoYMkyGv7w@landeda>

On Tue, 21 May 2024 19:44:24 +0200
"Yann E. MORIN" <yann.morin.1998@free.fr> wrote:

> I tried a bit earlier, and the genimage file is indeed sparse, but I
> could not find a tool that would report the list of holes/non-holes in a
> file, and their offset, e.g. something like:
> 
>                 size    offset
>     non-hole    2MiB    @0
>     hole        1MiB    @2MiB
>     non-hole    16MiB   @3MiB
>  and so on...

$ pip3 install sparseutils
$ truncate -s 512M file.img
$ sparsemap file.img 
HOLE 536870912

Seems like it's what we're looking for :-)

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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