[U-Boot-Users] [PATCH] fdt: add fdtcmd env var to allow post processing of device tree before boot

[Kumar Gala]

On Aug 4, 2008, at 3:55 PM, Scott Wood wrote:

> Kumar Gala wrote:
>> On Aug 4, 2008, at 3:27 PM, Wolfgang Denk wrote:
>>> So just run the needed commands before you run "bootm" as part of  
>>> your
>>> boot command sequence.
>> This doesnt work.  Lets say I want to remove a node or property  
>> that  ft_board_setup() adds.  If I do what you are suggesting the  
>> node or  prop will get added back:
>> fdt addr <FOO>
>> fdt boardsetup (we assume this adds /bar/prop)
>> fdt rm /bar/prop
>> bootm (will call ft_board_setup and add /bar/prop back)
>> This assumes I know the best location for the device tree before   
>> "bootm" which I'd argue isn't really true.  Especially if my dtb is  
>> in  flash.
>
> Why not?  Wouldn't it be just another environment variable, like the  
> load address for the kernel?

Right now the fdt is placed at the first 4k page after the kernel is  
decompressed.  I don't now where that address is.

- k