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

[Wolfgang Denk]

Dear =?GB2312?B?wdbWvsa9?=,

please post U-Boot related questions on the U-Boot mailing list.

In message <8148211e0911012034q72b3b9e2tec1b09cd98f7fa9f at mail.gmail.com> you wrote:
>
> I found that uboot which supports Open Frimware use R3 and R4 to pass dtb
> and kernel address to the kernel.

Please be careful with your terms. U-Boot does NOT support Open
Firmware - what sort of support should that be, by the way?

What U-Boot does is to support flattened device trees as a  means  of
passing  hardware  information to the Linux kernel. Note that this is
an architecture dependent feature.

> 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

Current versions of U-Boot support both booting with (for recent
kernels) or without (for older kernels) device tree image.

> And I find the source code of uboot1.3.1 and uboot 2009.08 have great
> difference.

Indeed. This is to be expected - there  are  more  than  2  years  of
development  between  these  two versions, so you can indeed expect a
LOT of changes (to be precise: this period covers 5032  commits  from
284  developers;  a  total of 685862 lines were added, 306543 removed
and 379319 changed).


Best regards,

Wolfgang Denk

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