linux-kernel - RE: [PATCH v5 0/3] Replay Protected Memory Block (RPMB) subsystem

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Date: Tue, 23 Apr 2024 08:22:05 +0000
From: Avri Altman <Avri.Altman@....com>
To: Jens Wiklander <jens.wiklander@...aro.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"op-tee@...ts.trustedfirmware.org" <op-tee@...ts.trustedfirmware.org>, Shyam
 Saini <shyamsaini@...ux.microsoft.com>, Ulf Hansson <ulf.hansson@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>, Jerome Forissier
	<jerome.forissier@...aro.org>, Sumit Garg <sumit.garg@...aro.org>, Ilias
 Apalodimas <ilias.apalodimas@...aro.org>, Bart Van Assche
	<bvanassche@....org>, Randy Dunlap <rdunlap@...radead.org>, Ard Biesheuvel
	<ardb@...nel.org>, Arnd Bergmann <arnd@...db.de>, Greg Kroah-Hartman
	<gregkh@...uxfoundation.org>
Subject: RE: [PATCH v5 0/3] Replay Protected Memory Block (RPMB) subsystem

> On Tue, Apr 23, 2024 at 8:42 AM Avri Altman <Avri.Altman@....com> wrote:
> >
> > > The OP-TEE driver finds the correct RPMB device to interact with by
> > > iterating over available devices until one is found with a
> > > programmed authentication matching the one OP-TEE is using. This
> > > enables coexisting users of other RPMBs since the owner can be
> > > determined by who knows the authentication key.
> > Devices in plural?
> > I am unaware of any board with multi eMMC devices soldered.
> > Can you refer me to such a platform?
> 
> I'm testing with a Hikey960 (HiSilicon Kirin 620)
> https://www.96boards.org/product/hikey
> It has one soldered eMMC and one removable eMMC.
I used to have that board but with a UFS2.1 version, so I can't really tell.
https://github.com/96boards/documentation/blob/master/consumer/hikey/hikey620/hardware-docs/hardware-user-manual.md#storage
indicating only a single eMMC device and a SD.

Either way, AFAIK there are no production designs that make use of more than a single embedded flash storage.
This goes for both eMMC and UFS.

Thanks,
Avri

> 
> Cheers,
> Jens