[meta-ti] Getting Started with meta-ti "rocko" and beaglebone black (BBB)

[Leo Meza]

Bill, thanks again for the reply. I must have had a dirty file because now
I can build just fine with am335x-evm, and I'm now using
core-image-full-cmdline and I'm able to boot and login just fine. I've
created some custom recipes and added ModemManager along with libQMI and
some other stuff. I'm trying to get ModemManager to bring up my 4G LTE
module over the USB connection. It looks like ModemManager isn't getting
started, I'm now trying to figure out how to get SystemD included in my
build and then how to use it to start ModemManager. Making progress now,
slow by steady.
Thanks again for the help,
Leo

On Thu, Aug 30, 2018 at 8:16 AM William Mills <wmills at ti.com> wrote:

>
>
> On 08/28/2018 10:58 AM, Leo Meza wrote:
> > Thanks Bill/Denys,
> >
> > I was getting errors when trying to build with am335x-evm machine,
>
> Can you report what error you had? I tried to reproduce your conditions
> and built and booted core-image-minimal with this machine just fine.
>
> I think solving the issue with am335x-evm is a much better way to go.
>
> > so I
> > stayed with beaglebone machine since it at least let me complete a
> > build. I'm still getting the repeating messages at the serial console,
>
> Yes, I did also with the beaglebone machine.  You are suppose to see the
> banner from SPL (MLO) and then a banner from U-boot (u-boot.img).  The
> fact that we don't see the U-boot banner means U-boot is not getting
> loaded or not running.  (It is resetting and staring over with SPL).
>
> Until you see that U-boot message, what you do with zImage and dtbs is
> irrelevant.
>
> I am not sure what is broken in SPL for the beaglebone configuration.  I
> did take a look and nothing jumped out at me.
> Again am335x-evm works.
>
> > here are my steps, maybe I'm still doing something wrong.
> > 1. Poky is at rocko branch 2731fd3
> > 2. meta-ti is at rocko branch b38fd82
> > 3. Replaced meta-yocto-bsp with meta-ti in bblayers.conf
> > 4. Set MACHINE ?= "beaglebone" in local.conf
> > 5. Build with "bitbake core-image-minimal"
> > 6. sudo cp MLO $BOOT
> > 7. sudo cp u-boot.img $BOOT
> > 8. sudo tar -xf core-image-minimal-beaglebone.tar.xz -C $ROOT
> > 9. sudo cp zImage $ROOT/boot
> > 10. sudo cp am335x-boneblack.dtb $ROOT/boot
> > 11. sudo tar -xvzf modules-beaglebone.tgz -C $ROOT
> > 12. Did not use uEnv.txt and did not change environment variables
> >
> > Not sure if I did this part right because I don't know what is meant by
> > "short form *.dtbs":
> > "Put zImage and the short form *.dtbs in root partitions' /boot dir"
> >
>
> You can copy all the dtbs if you wish. The bootloader used the ones with
> names like am335x-boneblack.dtb and ignores ones like
> zImage-am335x-boneblack.dtb and zImage--4.14.*-am335x-boneblack.dtb.
>
> If you do copy just the short form you need to follow symlinks so you
> actually have the files.
>
> (When I tested beaglebone I just dd the wic image to the SD card.  The
> explict steps above were for am335x-evm since it does not create a wic
> image)
>
> Bill
>
>
> > Any further tips/pointers would be appreciated.
> >
> > Thanks in advance,
> > Leo
> >
> > On Thu, Aug 23, 2018 at 6:42 PM William Mills <wmills at ti.com
> > <mailto:wmills at ti.com>> wrote:
> >
> >     Leo,
> >
> >     On 08/22/2018 02:18 PM, Leo Meza wrote:
> >     > I'm learning yocto and was able to easily boot my BBB with a
> >     > core-image-minimal system using the meta-yocto-bsp layer. However,
> >     when
> >     > I removed that layer and tried with meta-ti, I just see this on the
> >     > Putty serial console, it repeats over an over:
> >     >
> >     > U-Boot SPL 2018.01-g6d540394a4 (Aug 22 2018 - 16:33:01)
> >     > Trying to boot from MMC1
> >     > *** Warning - bad CRC, using default environment
> >     >
> >
> >     I was able to duplicate this result when using meta-ti to build the
> >     "beaglebone" machine.
> >
> >     TI builds and test the am335x-evm machine for all am335x based boards
> >     inlcuding beaglebone.  If you switch to this machine you should have
> >     better luck.
> >
> >     Note that as Denys said elsewhere TI images and default u-boot
> variable
> >     settings assume that the kernel is in the root partition not the boot
> >     partition.  The _path_ in the root partition should be /boot/zImage
> >
> >     The only thing you need in the boot partition is MLO and the
> u-boot.img.
> >     If you want to override the u-boot settings you can have a uEnv.txt
> file
> >     there.  Also if you save the environment from within u-boot it will
> end
> >     up as a file in the boot partition named uboot.env
> >
> >     I notice that the am335x-evm machine does not create a .wic image so
> you
> >     will have to assemble the parts from the deploy dir.
> >     Put MLO and u-boot.img in the boot partition
> >     untar the rootfs tar ball to the root partition
> >     Put zImage and the short form *.dtbs in root partitions' /boot dir
> >     untar the modules tar ball in the root partition.
> >
> >
> >     > I'm copying MLO, zImage, u-boot.img, and am335x-boneblack.dtb to
> the
> >     > BOOT (1st) partition of my uSD card. Then extracting
> >     > core-image-minimal-beaglebone.tar.xz -C to the ROOT (2nd)
> partition of
> >     > my uSD card. This works fine when using meta-yocto-bsp, but not
> with
> >     > meta-ti. So, if anyone can help me understand what the different
> steps
> >     > are between using the two different layers, I'd greatly appreciate
> it.
> >     > Spent several days trying to figure this out so far.
> >     >
> >     > Thanks in advance,
> >     > Leo
> >     >
> >     >
> >
> >     Denys,
> >
> >     The beaglebone machine creates a much smaller MLO (~75K vs 109K) and
> >     u-boot.img.
> >     When you boot the image the SPL just spits out the message above over
> >     and over.  It never gets to u-boot.
> >
> >     To reproduce I started with a clean clone of poky
> >     added a clean clone of meta-ti
> >     checked out rocko for both
> >     . oe-*
> >     edit conf/bblayers to take out yocto-bsp (for safty sake)
> >     added meta-ti
> >     built core-image-minimal for beaglebone machine.
> >
> >     Bill
> >
>
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