Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <CAOuPNLjgpkBh9dnfNTdDcfk5HiL=HjjiB9o_=fjrm+0vP7Re2Q@mail.gmail.com>
 <CAOuPNLh_0Q9w96GKT-ogC0BBcEHgo=Hv3+c=JBcas2VgqDiyaw@mail.gmail.com>
 <CAOuPNLjmJ0YufFktJzjkyvdxwFTOpxVj5AW5gANAGSG=_yT=mQ@mail.gmail.com>
 <1762403920.6716767.1621029029246@webmail.123-reg.co.uk> <CAOuPNLhn90z9i6jt0-Vv4e9hjsxwYUT2Su-7SQrxy+N=HDe_xA@mail.gmail.com>
 <486335206.6969995.1621485014357@webmail.123-reg.co.uk> <CAOuPNLjBsm9YLtcb4SnqLYYaHPnscYq4captvCmsR7DthiWGsQ@mail.gmail.com>
 <1339b24a-b5a5-5c73-7de0-9541455b66af@geanix.com> <CAOuPNLiMnHJJNFBbOrMOLmnxU86ROMBaLaeFxviPENCkuKfUVg@mail.gmail.com>
 <4304c082-6fc5-7389-f883-d0adfc95ee86@geanix.com>
In-Reply-To: <4304c082-6fc5-7389-f883-d0adfc95ee86@geanix.com>
From:   Pintu Agarwal <pintu.ping@gmail.com>
Date:   Mon, 31 May 2021 08:24:49 +0530
Message-ID: <CAOuPNLigHdbu_OTpsFr7gq+nFK2Pv+4MUSrC6A6PfKfF1H1X3Q@mail.gmail.com>
Subject: Re: [RESEND]: Kernel 4.14: UBIFS+SQUASHFS: Device fails to boot after
 flashing rootfs volume
To:     Sean Nyekjaer <sean@geanix.com>
Cc:     Phillip Lougher <phillip@squashfs.org.uk>,
        open list <linux-kernel@vger.kernel.org>,
        linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Tue, 25 May 2021 at 11:07, Sean Nyekjaer <sean@geanix.com> wrote:
> We are writing our rootfs with this command:
> ubiupdatevol /dev/ubi0_4 rootfs.squashfs
>
> Please understand the differences between the UBI and UBIFS. UBI(unsorted block image) and UBIFS(UBI File System).
> I think you want to write the squashfs to the UBI(unsorted block image).
>
> Can you try to boot with a initramfs, and then use ubiupdatevol to write the rootfs.squshfs.
>
Dear Sean, thank you so much for this suggestion.
Just a final help I need here.

For future experiment purposes, I am trying to setup my qemu-arm
environment using ubifs/squashfs and "nandsim" module.
I already have a working setup for qemu-arm with busybox/initramfs.
Now I wanted to prepare ubifs/squashfs based busybox rootfs which I
can use for booting the mainline kernel.
Is it possible ?
Are there already some pre-built ubifs images available which I can
use for my qemu-arm ?
Or, please guide me how to do it ?

I think it is more convenient to do all experiments with "nandsim"
instead of corrupting the actual NAND hardware.
If you have any other suggestions please let me know.


Thanks,
Pintu