[U-Boot] question regarding the odroidc2 board support

[Lukasz Majewski <lukma@denx.de>]

On Wed, 28 Jun 2017 10:44:17 +0200
daggs <daggs@gmx.com> wrote:

> Greetings Lukasz,
> 
> > Sent: Tuesday, June 27, 2017 at 4:12 PM
> > From: "Lukasz Majewski" <lukma@denx.de>
> > To: daggs <daggs@gmx.com>
> > Cc: u-boot at lists.denx.de
> > Subject: Re: [U-Boot] question regarding the odroidc2 board support
> >
> > On Tue, 27 Jun 2017 13:58:46 +0200
> > daggs <daggs@gmx.com> wrote:
> > 
> > > Greetings Lukasz 
> > > 
> > > > Sent: Tuesday, June 27, 2017 at 10:57 AM
> > > > From: "Lukasz Majewski" <lukma@denx.de>
> > > > To: daggs <daggs@gmx.com>
> > > > Cc: u-boot at lists.denx.de
> > > > Subject: Re: [U-Boot] question regarding the odroidc2 board
> > > > support
> > > >
> > > > On Thu, 22 Jun 2017 19:55:21 +0200
> > > > daggs <daggs@gmx.com> wrote:
> > > > 
> > > > > Greetings,
> > > > > 
> > > > > I'm using buildroot to generate images for the odroid c2
> > > > > boards and from what I see, it uses u-boot.bin to burn into
> > > > > the image. I'm not seeing any other uboot product that is
> > > > > used for booting (unless I'm mistaken). I'm reading the
> > > > > odroid c2 readme file and I see it instructs the use to burn
> > > > > a alternative u-boot.bin from the one that was created by the
> > > > > env. I wonder how it is possible to actually use newer uboot
> > > > > when in the end uboot recommends to replace u-boot.bin with
> > > > > pre existing one?
> > > > 
> > > > From the spec I do see that C2 has SD card and eMMC.
> > > > 
> > > > I can only share my experience with Odroid XU3/U3.
> > > > 
> > > > The boot process would (probably) require some signed blobs from
> > > > hardkernel (those binaries are corresponding to u-boot-spl.bin).
> > > > 
> > > > I can recommend looking to Hardkernel forum (they should have
> > > > some topics dedicated for this SoM), or look for tizen.org wiki:
> > > > 
> > > > https://wiki.tizen.org/Quick_guide_for_odroidxu3
> > > > 
> > > > I hope, that the boot flow is similar for XU3 and C2.
> > > > 
> > > > > 
> > > > > Thanks,
> > > > > 
> > > > > Dagg.
> > > > > _______________________________________________
> > > > > U-Boot mailing list
> > > > > U-Boot at lists.denx.de
> > > > > https://lists.denx.de/listinfo/u-boot
> > > > 
> > > > 
> > > > 
> > > > 
> > > > Best regards,
> > > > 
> > > > Lukasz Majewski
> > > > 
> > > > --
> > > > 
> > > > DENX Software Engineering GmbH,      Managing Director: Wolfgang
> > > > Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194
> > > > Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax:
> > > > (+49)-8142-66989-80 Email: wd at denx.de
> > > > 
> > > 
> > > indeed that is correct, the c2 has a singed binary.
> > > as said in my mail, I'm using buildroot to create my images, at
> > > the end buildroot takes the file u-boot.bin and burn it into the
> > > image at a specific location. the c2 readme explains how to
> > > extract the signed blob but I'd expect that it will overwrite
> > > part of the u-boot.bin file and no replace it. so I assume I'm
> > > missing a part. e.g. u-boot.bin isn't the only file needed from
> > > u-boot. am I correct?
> > 
> > I can only speak by having some experience with Odroid XU3.
> > 
> > XU3 had bl1.bin.hardkernel, which was signed (and this corresponds
> > to u-boot's SPL binary).
> > 
> > This bl1 called "normal" u-boot (u-boot.bin).
> > 
> > And afterwards u-boot was calling uImage + DTB.
> > 
> > There was also problem with the eMMC layout - you had to jump
> > somewhere else since the default "partition" for u-boot (512 KiB)
> > was too small.
> > 
> > Also please pay a note if you need any TZW (trust zone) firmware for
> > your platform.
> > 
> > Have you found any info on hardkerne's wiki/forum?
> > 
> > > 
> > > Thanks.
> > > 
> > > Dagg.
> > 
> > 
> > 
> > 
> > Best regards,
> > 
> > Lukasz Majewski
> 
> yes, I did asked a question regarding this but didn't got any answer.
> I've decided to ask the uboot devs as from what I understand, the
> hardkernel guys must comply with uboot's guidelines.
> 
> so my question is, does u-boot.bin is the only product from u-boot
> which is added into the image?

From my Exynos development experience - yes it is the only one.

> 
> Thanks,
> 
> Dagg.
> 
> Dagg.




Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de