[meta-freescale] [meta-fsl-arm-extra] Booting RIoTboard

[Nikolay Dimitrov]

Hi Gary,

On 04/23/2015 03:18 AM, Nikolay Dimitrov wrote:
> Hi Gary,
>
> On 04/23/2015 12:37 AM, Gary Thomas wrote:
>> I've just built an image for the i.MX6DL/RIoTboard using the latest
>> master (fido).  I had to add this line to local.conf:
>> MACHINE_EXTRA_RRECOMMENDS_remove_imx6dl-riotboard =
>> "fsl-alsa-plugins" as the fsl-alsa-plugins won't currently build with
>> Linux-4.0
>>
>> Now I'm trying to boot the image.  I've copied it to my SD card and
>> set the switches appropriately (I found two web pages about this and
>> they have conflicting information!  The answer seems to be
>> SW1-SW8=On/Off/On/Off/Off/On/Off/On)
>
> I have 2 riotboards both booting from sdcards, here are their
> configurations:
> - slot J6 (USDHC2), SW1-8 = On/Off/On/Off/Off/On/On/Off
> - slot J7 (USDHC3), SW1-8 = On/Off/On/Off/Off/On/Off/On
>
>> I get the U-Boot prompt from the image I built (it has today's date),
>> but the SD card doesn't boot from there.  The default boot commands
>> seem to be looking for boot scripts, etc, but there are none on the
>> SD card, only a zImage and DTB file.
>>
>> Is there some documentation, perhaps in meta-fsl-arm-extra, that
>> helps (and I've missed)??
>>
>> Any help on how to boot this board would be appreciated.
>
> Fido uses U-Boot v2015.04. Assuming that you haven't modifed the
> upstream version, v2015.04 uses extlinux boot mechanism, which requires
> the following files to be available on your boot partition:
>
> /boot/extlinux/extlinux.conf
> /boot/imx6dl-riotboard.dtb
> /boot/uImage
>
> Extlinux.conf should have the following content:
>
> default yocto
> label yocto
> kernel /boot/uImage
> devicetree /boot/imx6dl-riotboard.dtb
> append console=ttymxc1,115200 root=/dev/mmcblk0p1 rw

Of course, change root= to suit your configuration.

> Technically speaking, recent versions of U-Boot for riotboard are quite
> plug-and-play - as long as you have properly placed your extlinux
> files, the bootloader will automatically find them on any attached
> storage and boot as piece of cake (works also with rootfs on usb-disk).
>
> If you have partitioned the sdcard with a modern version of fdisk, the
> 1st partition will be properly located at 1MiB offset, thus leaving
> more than enough space for U-Boot.
>
> Hope this helps. Regards,
> Nikolay

Regards,
Nikolay