[U-Boot] [PATCH] arm: imx: Switch Wandboard to use config_distro_bootcmd.h.

[Nikolay Dimitrov <picmaster@mail.bg>]

Hi XoD,

On 06/26/2015 02:54 PM, XoD wrote:
> Hello,
> I have now tested upstream uboot-imx with OpenELEC with SPL suppport for
> wandbard.
>
> It's work great without your patch. but with your path, OpenELEC don't boot.
>
> The default uboot config assume than kernel file name is zImage.
> But OpenELEC use a filename KERNEL.
> The actual version of OpenELEC use a uEnv.txt file with this line :
> zImage=/KERNEL
> bootfile=/KERNEL
> But this no longer work with your patch.
>
> How I can configure uboot to open a file named KERNEL instead of zImage (at
> build time or at runtime) ?

config_distro_bootcmd uses a cool feature called "extlinux", which
allows you to define a boot configuration without hacking in U-Boot
source/configuration. Here's how it works:

1. U-Boot scans a list of boot devices (mmc, usb, pxe, dhcp)
2. When it find a bootable local storage (mmc, usb) it looks for the
first bootable partition, or just first one if no partition was marked
as bootable
3. U-Boot looks for extlinux.conf in "/" and "/boot". This file
contains the actual boot configuration (kernel image, bootargs, etc)
that will be executed on boot. Here's how a simple extlinux.conf looks
like:

-----> cut <-----
default linux

label linux
kernel /boot/zImage
devicetree /boot/mydevicetree.dtb
append console=ttymxc1,115200 root=/dev/mmcblk0p1 rw
-----> cut <-----

4. U-Boot boots the "default" configuration.

Hope this helps.

Regards,
Nikolay