[ELDK] From which version does u-boot support Open Firmware?

[林志平]

I found that uboot which supports Open Frimware use R3 and R4 to pass dtb
and kernel address to the kernel.
while the uboot which donot support Open Firmware use
 /*
  * Linux Kernel Parameters (passing board info data):
  *   r3: ptr to board info data
  *   r4: initrd_start or 0 if no initrd
  *   r5: initrd_end - unused if r4 is 0
  *   r6: Start of command line string
  *   r7: End   of command line string
  */
And I find the source code of uboot1.3.1 and uboot 2009.08 have great
difference.