linux-kernel - Re: [PATCH 2/5] mtd: block2mtd: Add support for specifying MTD write size and subpage shift

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20170717123424.GD16493@pali>
Date:   Mon, 17 Jul 2017 14:34:24 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Richard Weinberger <richard@....at>
Cc:     Pavel Machek <pavel@....cz>, David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Artem Bityutskiy <dedekind1@...il.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] mtd: block2mtd: Add support for specifying MTD write
 size and subpage shift

On Sunday 18 June 2017 12:11:40 Richard Weinberger wrote:
> Pavel,
> 
> Am 18.06.2017 um 12:06 schrieb Pavel Machek:
> > Hi!
> > 
> >>>>>> Am 02.06.2017 um 17:43 schrieb Pali Rohár:
> >>>>>>> It is needed for creating emulated devices suitable for using in UBI layer
> >>>>>>> and with UBIFS.
> >>>>>>
> >>>>>> Why?
> >>>>>
> >>>>> ubifs depends on write size of nand. And without those parameters as
> >>>>> specified in cover letter I'm unable to mount N900 rootfs image exported
> >>>>> via block2mtd. ubifs reject such image.
> >>>>
> >>>> Hmm, so you render block2mtd into a semi-NAND chip? :)
> >>>
> >>> Probably you can call it like that. But it is still MTD device...
> >>
> >> This is what I meant in my other mail.
> >> You add NAND specific properties but still denote it as MTD_RAM/ROM.
> >> I'm not sure whether this is a good idea.
> > 
> > Can you suggest any other way for Pali to mount rootfs image on his
> > PC?
> 
> Are you my micro manager? ;-)
> 
> As stated in my other mail, we have nandsim and there is work going on
> to allow specifying arbitrary NAND sizes.
> An alternative approach can be found here:
> https://lkml.org/lkml/2016/5/12/296
> 
> Thanks,
> //richard

Back to the this patch series. There are also other patches in this
series. If you at least comment/review other patches if this one is
"problematic"?

-- 
Pali Rohár
pali.rohar@...il.com