[meta-ti] BeagleBone Black , u-boot, and zImage

[Diego Sueiro]

Carlos,

On Thu, Aug 14, 2014 at 5:20 PM, Denys Dmytriyenko <denys at ti.com> wrote:

> On Thu, Aug 14, 2014 at 10:09:01PM +0200, Carlos Rafael Giani wrote:
> > On 08/14/2014 10:04 PM, Denys Dmytriyenko wrote:
> > >On Thu, Aug 14, 2014 at 09:53:34PM +0200, Carlos Rafael Giani wrote:
> > >>Hello,
> > >>
> > >>after building a rootfs for the Beaglebone Black, I see the
> > >>following files in the deploy folder for the machine:
> > >>
> > >>MLO
> > >>u-boot.img
> > >>u-boot-spl.bin
> > >>zImage
> > >>
> > >>as well as other symlinks with "-beaglebone" attached to their
> filenames.
> > >>
> > >>What should I copy, the SPL bin, or the .img u-boot binary?
> > >>Also, u-boot tries to load a uImage, even though a zImage was built.
> > >>There is also no uEnv.txt file.
> > >>Do I have to write one to be able to let u-boot load the zImage, or
> > >>should it work out-of-the-box?
> > >Depends on the rootfs image you are building. Most images that are
> based on
> > >core-image-base will take care of deploying necessary pieces into the
> rootfs.
> > >But core-image-minimal is special and very bare-bone, so extra manual
> steps
> > >are required.
> > >
> > >Regardless of the rootfs image, you'd need MLO and u-boot.img to be
> located in
> > >the first FAT partition of your SD card or eMMC flash.
> > >
> > >Then, if your rootfs does not already have zImage and the necessary DTB
> files
> > >in the /boot directory, you have to place them there (i.e.
> core-image-minimal)
> > >and you are ready to boot. All the defaults will work for
> out-of-the-box in
> > >this case. No uEnv.txt is necessary, unless you need to do something
> extra
> > >special...
> > >
> >
> > Oh, I just built core-image-base .
> >
> > So I should use the .img and not the SPL .bin? I was wondering if
> > the SPL bin is a newer binary that will eventually replace the .img
> > one.
> >
> > But when I use the .img file, it turns out that it tries to load a
> > uImage, even though a zImage was built. Simply setting the bootfile
> > env var to "zImage" won't work, because the u-boot script will try
> > to boot with the incorrect command.
> >
> > I am trying to rule out that something went wrong in my build, that
> > something is wrong in my setup. If I build core-image-base , the
> > resulting u-boot.img should automatically load a zImage, not a
> > uImage, correct?
>
> u-boot-spl.bin, while named weird, is a special SPL binary (i.e. MLO) for
> UART
> booting - loading u-boot and the rest over serial. They are similar in
> sizes
> with MLO...
>
> The real u-boot.img should boot zImage by default - make sure you are
> building
> the correct one from meta-ti. The one named u-boot-ti-staging is preferred,
> but u-boot_2014.07 should also be fine.


Here you have some instructions on how to "cook" an sdcard for beaglebone
black:
http://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/README.hardware

Regards,

--
*dS
Diego Sueiro

Administrador do Embarcados
www.embarcados.com.br
<http://www.embarcados.com.br/?utm_source=assinatura_diego&utm_medium=e-mail&utm_campaign=Assinatura%20Email%20Diego>

/*long live rock 'n roll*/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.yoctoproject.org/pipermail/meta-ti/attachments/20140815/84c254e3/attachment-0001.html>