Hi Arnout,

Thank you very much !

Best regards,
Zvika

On Sat, Sep 17, 2022 at 11:05 PM Arnout Vandecappelle <arnout@mind.be>
wrote:

>
>
> On 11/09/2022 19:58, Zvi Vered wrote:
> > Hello,
> >
> > I'm using buildroot 2022.02.1 under x86 embedded SBC.
> > The root file system is located on the on-board disk.
> > The boot argument contains 'ro' (checked with /proc/cmdline after login)
> but the
> > disk is not read-only.
>
>   There is a buildroot config option BR2_TARGET_GENERIC_REMOUNT_ROOTFS_RW
> which
> defaults to enabled. It will remount the rootfs to read-write as part of
> processing /etc/fstab. So you should probably turn that option off. Note
> that if
> you use systemd, you'll need to do a clean rebuild before the option is
> taken
> into account.
>
>
> > When I used the same boot args with busybox, it worked fine.
> > Of course with busybox I had to tailor all other mandatory files and
> directories.
> >
> > I need read-only rootfs to defend this embedded system in case of
> power-down /
> > cold reset.
>
>   Perhaps you're better off then to use an actual readonly filesystem,
> like
> erofs or squashfs? You have to make sure the corresponding kernel options
> are
> enabled, of course.
>
>   Regards,
>   Arnout
>
> >
> > Beyond the default configuration, the rootfs also contains ntp client,
> httpd,
> > pci tools.
> >
> > Thank you,
> > Zvika
> >
> >
> >
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>