From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Kocialkowski Date: Fri, 04 Mar 2016 08:12:06 +0100 Subject: [U-Boot] U-Boot as first bootloader on Exynos platforms In-Reply-To: References: <1456666860.1683.5.camel@paulk.fr> <20160229111503.341f4346@amdc2363> <1456819811.1157.4.camel@paulk.fr> Message-ID: <1457075526.1386.0.camel@paulk.fr> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi, Le mardi 01 mars 2016 ? 06:27 -0700, Simon Glass a ?crit?: > On 1 March 2016 at 01:10, Paul Kocialkowski wrote: > > Hi, > > Le lundi 29 f?vrier 2016 ? 19:03 -0700, Simon Glass a ?crit : > > > On 29 February 2016 at 03:15, Lukasz Majewski > > > wrote: > > > > > I was told some time ago that a publicly-available version of the > > > > > Samsung Chromebook 2 (supposedly, the one with an Exynos 5800 SoC) > > > > > allows running unsigned code (the U-Boot SPL) directly after the > > > > > bootrom. Is that correct? > > > > > > > > > > Do you know of any (other) publicly available device with an Exynos > > > > > SoC that doesn't check for the first bootloader's signature, and thus > > > > > could load the U- Boot SPL without any intermediary signed stage on > > > > > storage memory? > > > > > > > > For sure Odroid XU3 needs signed SPL to boot up, so this devel board > > > > will not work for you. > > > > > > You can use snow which is Chromebook 1, or pit / pi which are > > > Chromebook 2. I have not tried its 'BL1' with Odroid XU3 but I doubt > > > it will work. > > > > I know those have U-Boot support, but do any of them work without the > > proprietary and signed on-memory first stage bootloaders? > > > > I was told that at least snow's bootrom checks the signature of the first > > bootloader it loads from memory. Is it the case for all Exynos devices? > > I think that is true for all. But in the case of these Chromebooks, > the BL1 does not check the signature of the image it loads, which > breaks the chain. For Chrome OS, this kind of restriction is not > useful, since the user should be able to run their own software on the > platform. I'm really not sure why XU3 cannot do this too. Thanks for the clarification! -- Paul Kocialkowski, low-level free software developer on embedded devices Website: https://www.paulk.fr/ Coding blog: https://code.paulk.fr/ Git repositories: https://git.paulk.fr/ https://git.code.paulk.fr/ -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: This is a digitally signed message part URL: