[U-Boot] minnowboard max .dtb file

[Beaman, Thomas]

Hi Bin,

Thanks you for the quick response, my responses are embedded below

On Wed, Jun 24, 2015 at 10:38 PM, Beaman, Thomas <Thomas.Beaman at xerox.com> wrote:
>> Hi Bin,
>>
>> I see that you have created a .dts file for the minnowboard max in arch/x86/dts/minnow.dts  What I cannot see is how to load and use this file. I cannot find any example of its use.

> You can read doc/README.fdt-control to understand how dts is compiled to dtb and used by U-Boot.

I am ok with the compiling part , and this readme does explain the U-Boot FDT usage. Thanks for pointing this out.

>> In the RAMBOOT line zboot is used to load the kernel and ramdisk, but it does not take a parameter for an FDT file. Any insight you can provide on the use of a dtb file for the minnow max would be appreciated.

> zboot is used to load linux kernel while a typical x86 kernel does not require dtb (although linux x86 supports device tree as its configuration source). And you seems to be confused by dtbs. The dtb U-Boot is using is not the same one passed to linux kernel on arm/powerpc.

You are correct I was confused about the usage of the dtb file in U-Boot.  I know it is probably outside the scope of U-Boot, but do you have any pointers to info on linux x86 kernel usage of a FDT (dtb) file for configuration source

Regards,
Tom