* [U-Boot] Is there any full story about how to take advantage FDT function ?
@ 2009-09-01 13:48 Gao Ya'nan
2009-09-05 18:41 ` Jerry Van Baren
0 siblings, 1 reply; 7+ messages in thread
From: Gao Ya'nan @ 2009-09-01 13:48 UTC (permalink / raw)
To: u-boot
And how to configure the kernel to minimize the code modification ?
I am porting U-Boot and Linux to a new board with a MPC875 processor
and two serial chips, and U-Boot runs well now. I hear that the FDT
function can tell the kernel devices information more flexibly and
reduce the code modification indirectly.
But I didn't find enough materials to make my head clear, so any tip
is greatly appreciated.
Thanks.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [U-Boot] Is there any full story about how to take advantage FDT function ?
2009-09-01 13:48 [U-Boot] Is there any full story about how to take advantage FDT function ? Gao Ya'nan
@ 2009-09-05 18:41 ` Jerry Van Baren
2009-09-06 0:12 ` Gao Ya'nan
2009-09-09 18:53 ` Scott Wood
0 siblings, 2 replies; 7+ messages in thread
From: Jerry Van Baren @ 2009-09-05 18:41 UTC (permalink / raw)
To: u-boot
Gao Ya'nan wrote:
> And how to configure the kernel to minimize the code modification ?
>
> I am porting U-Boot and Linux to a new board with a MPC875 processor
> and two serial chips, and U-Boot runs well now. I hear that the FDT
> function can tell the kernel devices information more flexibly and
> reduce the code modification indirectly.
>
> But I didn't find enough materials to make my head clear, so any tip
> is greatly appreciated.
>
> Thanks.
Hi Gao,
I'm not up on 8xx, but it may not have been pulled forward into the
"powerpc" architecture (still "ppc"). The "powerpc" architecture switch
is where linux/u-boot started using the FDT.
Best regards,
gvb
^ permalink raw reply [flat|nested] 7+ messages in thread
* [U-Boot] Is there any full story about how to take advantage FDT function ?
2009-09-05 18:41 ` Jerry Van Baren
@ 2009-09-06 0:12 ` Gao Ya'nan
2009-09-09 18:53 ` Scott Wood
1 sibling, 0 replies; 7+ messages in thread
From: Gao Ya'nan @ 2009-09-06 0:12 UTC (permalink / raw)
To: u-boot
Hi, Jerry.
2009/9/6 Jerry Van Baren <gvb.uboot@gmail.com>:
> Gao Ya'nan wrote:
>>
>> And how to configure the kernel to minimize the code modification ?
>>
>> I am porting U-Boot and Linux to a new board with a MPC875 processor
>> and two serial chips, ?and U-Boot runs well now. I hear that the FDT
>> function can tell the kernel devices information more flexibly and
>> reduce the code modification indirectly.
>>
>> But I didn't find enough materials to make my head clear, so any tip
>> is greatly appreciated.
>>
>> Thanks.
>
> Hi Gao,
>
> I'm not up on 8xx, but it may not have been pulled forward into the
> "powerpc" architecture (still "ppc"). ?The "powerpc" architecture switch is
> where linux/u-boot started using the FDT.
>
I use U-Boot-V2009.8 and Linux-DENX-v2.6.30.3, and I can't find
arch/ppc any more. So, I think FDT will work well in MPC8xx platform.
But I don't know how to use it, perhaps I shoud try the standard
MPC885 configuration and dtb file.
> Best regards,
> gvb
>
Thanks.
Best regards
Gao Ya'nan
^ permalink raw reply [flat|nested] 7+ messages in thread
* [U-Boot] Is there any full story about how to take advantage FDT function ?
2009-09-05 18:41 ` Jerry Van Baren
2009-09-06 0:12 ` Gao Ya'nan
@ 2009-09-09 18:53 ` Scott Wood
2009-09-09 22:28 ` Gao Ya'nan
1 sibling, 1 reply; 7+ messages in thread
From: Scott Wood @ 2009-09-09 18:53 UTC (permalink / raw)
To: u-boot
On Sat, Sep 05, 2009 at 02:41:19PM -0400, Jerry Van Baren wrote:
> I'm not up on 8xx, but it may not have been pulled forward into the
> "powerpc" architecture (still "ppc"). The "powerpc" architecture switch
> is where linux/u-boot started using the FDT.
8xx is supported in arch/powerpc.
-Scott
^ permalink raw reply [flat|nested] 7+ messages in thread
* [U-Boot] Is there any full story about how to take advantage FDT function ?
2009-09-09 18:53 ` Scott Wood
@ 2009-09-09 22:28 ` Gao Ya'nan
2009-09-09 22:32 ` Scott Wood
0 siblings, 1 reply; 7+ messages in thread
From: Gao Ya'nan @ 2009-09-09 22:28 UTC (permalink / raw)
To: u-boot
2009/9/10 Scott Wood <scottwood@freescale.com>:
> On Sat, Sep 05, 2009 at 02:41:19PM -0400, Jerry Van Baren wrote:
>> I'm not up on 8xx, but it may not have been pulled forward into the
>> "powerpc" architecture (still "ppc"). ?The "powerpc" architecture switch
>> is where linux/u-boot started using the FDT.
>
> 8xx is supported in arch/powerpc.
Yes, I have add CONFIG_OF_LIBFDT and CONFIG_OF_BOARD_SETUP for the FDT
support which is missing in U-Boot-v2009.08, and it works well, but I
found none complete document on how to write a dts file and add
special device in it.
Any tips? Thanks
Gao Ya'nan
>
> -Scott
>
^ permalink raw reply [flat|nested] 7+ messages in thread
* [U-Boot] Is there any full story about how to take advantage FDT function ?
2009-09-09 22:28 ` Gao Ya'nan
@ 2009-09-09 22:32 ` Scott Wood
2009-09-09 22:37 ` Gao Ya'nan
0 siblings, 1 reply; 7+ messages in thread
From: Scott Wood @ 2009-09-09 22:32 UTC (permalink / raw)
To: u-boot
Gao Ya'nan wrote:
> 2009/9/10 Scott Wood <scottwood@freescale.com>:
>> On Sat, Sep 05, 2009 at 02:41:19PM -0400, Jerry Van Baren wrote:
>>> I'm not up on 8xx, but it may not have been pulled forward into the
>>> "powerpc" architecture (still "ppc"). The "powerpc" architecture switch
>>> is where linux/u-boot started using the FDT.
>> 8xx is supported in arch/powerpc.
>
> Yes, I have add CONFIG_OF_LIBFDT and CONFIG_OF_BOARD_SETUP for the FDT
> support which is missing in U-Boot-v2009.08, and it works well, but I
> found none complete document on how to write a dts file and add
> special device in it.
>
> Any tips? Thanks
See Documentation/powerpc/booting-without-of.txt,
Documentation/powerpc/dts-bindings, and the ePAPR specification for
information on the content of device trees.
-Scott
^ permalink raw reply [flat|nested] 7+ messages in thread
* [U-Boot] Is there any full story about how to take advantage FDT function ?
2009-09-09 22:32 ` Scott Wood
@ 2009-09-09 22:37 ` Gao Ya'nan
0 siblings, 0 replies; 7+ messages in thread
From: Gao Ya'nan @ 2009-09-09 22:37 UTC (permalink / raw)
To: u-boot
2009/9/10 Scott Wood <scottwood@freescale.com>:
> Gao Ya'nan wrote:
>>
>> 2009/9/10 Scott Wood <scottwood@freescale.com>:
>>>
>>> On Sat, Sep 05, 2009 at 02:41:19PM -0400, Jerry Van Baren wrote:
>>>>
>>>> I'm not up on 8xx, but it may not have been pulled forward into the
>>>> "powerpc" architecture (still "ppc"). ?The "powerpc" architecture switch
>>>> is where linux/u-boot started using the FDT.
>>>
>>> 8xx is supported in arch/powerpc.
>>
>> Yes, I have add CONFIG_OF_LIBFDT and CONFIG_OF_BOARD_SETUP for the FDT
>> support which is missing in U-Boot-v2009.08, and it works well, but I
>> found none complete document on how to write a dts file and add
>> special device in it.
>>
>> Any tips? Thanks
>
> See Documentation/powerpc/booting-without-of.txt,
> Documentation/powerpc/dts-bindings, and the ePAPR specification for
> information on the content of device trees.
I miss the later two, thanks for your tips.
Gao.
>
> -Scott
>
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2009-09-09 22:37 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2009-09-01 13:48 [U-Boot] Is there any full story about how to take advantage FDT function ? Gao Ya'nan
2009-09-05 18:41 ` Jerry Van Baren
2009-09-06 0:12 ` Gao Ya'nan
2009-09-09 18:53 ` Scott Wood
2009-09-09 22:28 ` Gao Ya'nan
2009-09-09 22:32 ` Scott Wood
2009-09-09 22:37 ` Gao Ya'nan
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