What's different between CONFIG_OF_LIBFDT and CONFIG_OF_FLAT_TREE? My board is mpc8641d and u-boot version is 1.3.1. I f I define CONFIG_OF_FLAT_TREE,and u-boot command bootm will call ft_setup() function, and how is it work?I found DTS files under kernel /arch/powerpc/sysDev directory,Could you give me some advice how to build it?

Thanks,

Jie

Jerry Van Baren gerald.vanbaren@ge.com wrote: jie han wrote:

I define CONFIG_OF_FLAT_TREE support under u-boot.I just want to know how can I get/set the third address(the address of the device-tree blob) that we will use at bootm command?Thanks ahead,

Sincerely, Jie

Hi Jie,

Board and processor are??? U-boot version is???

You most likely want to define CONFIG_OF_LIBFDT, CONFIG_OF_FLAT_TREE is deprecated.

I'm presuming you are using a recent u-boot (preferably tip-o-tree).

The device tree blob will be where you load it. :-) TFTP is a convenient method...

Your question could be interpreted that you don't have a blob to load. If not, you need to generate a blob using a FDT source file (.dts) that describes your hardware and compiled it with "dtc". Example FDT sources and the device tree compiler itself are now part of the linux kernel sources.

Good luck, gvb

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Hello, I've made a port of u-boot-1.3.1 to a WindRiver sbc8256 board with CONFIG_OF_LIBFDT defined. Is the dtc-1.0.0 usable along with the U-boot version 1.3.1 or do I need to get a newer dtc?

Cheers // Matias

jie han wrote:

...

What's different between CONFIG_OF_LIBFDT and CONFIG_OF_FLAT_TREE?

CONFIG_OF_FLAT_TREE was the original FDT interface code and had a ...uh... funky interface. David Gibson wrote a FDT library intended for embedded use and CONFIG_OF_LIBFDT uses that. We've been switching processors/boards over. I believe the switchover is mostly complete.

...

My board is mpc8641d and u-boot version is 1.3.1.

No direct experience, but I believe that is good. Is this a custom board or an eval board? If it is a custom board, you will need to generate an appropriate *.dts file by customizing an example.

...

I f I define CONFIG_OF_FLAT_TREE,and u-boot command bootm will call ft_setup() function, and how is it work?

With CONFIG_OF_LIBFDT, bootm calls the appropriate board and processor setup routines fdt_chosen() and ft_board_setup().

Note that CONFIG_OF_LIBFDT adds the "fdt" command which is very helpful for printing out out (and modifying) blob data.

...

I found DTS files under kernel /arch/powerpc/sysDev directory,Could you give me some advice how to build it?

You need to build the device tree compiler (dtc). You can get the source from Jon Loeliger's repository: http://jdl.com/git_repos/

...

Thanks, Jie

[snip]

gvb

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