How to use the device tree for lite5200

How to use the device tree for lite5200

[Wolfgang Grandegger]

Hello,

I want to boot PowerPC Linux 2.6.19 on my Icecube board but I didn't 
succeed yet to get lite5200.dts compiled and an appropriate image created:

   $ dtc -b0 lite5200.dts
   DTC: dts->dts  on file "lite5200.dts"
   ERROR: Missing /chosen node
   Input tree has errors

What is the procedure to make and boot an uImage for the U-Boot 
bootloader. I read about the third argument for bootm but did not 
understand how to use it.

TIA.

Wolfgang.

Re: How to use the device tree for lite5200

[Kumar Gala]

On Dec 6, 2006, at 9:59 AM, Wolfgang Grandegger wrote:

> Hello,
>
> I want to boot PowerPC Linux 2.6.19 on my Icecube board but I didn't
> succeed yet to get lite5200.dts compiled and an appropriate image  
> created:
>
>    $ dtc -b0 lite5200.dts
>    DTC: dts->dts  on file "lite5200.dts"
>    ERROR: Missing /chosen node
>    Input tree has errors
>
> What is the procedure to make and boot an uImage for the U-Boot
> bootloader. I read about the third argument for bootm but did not
> understand how to use it.

How have you booted in the past?  Do you tftp down the images or run  
from flash?

Here's an example assuming you have a kernel image at address  
$loadaddr and the dtb at $ftaddr

dtc -b0 -Idts -Odtb -V16 lite5200.dts > lite5200.dtb

download lite5200.dtb to the system

=> bootm $loadaddr - $fdtaddr

- k

Re: How to use the device tree for lite5200

[Wolfgang Grandegger]

Kumar Gala wrote:
> 
> On Dec 6, 2006, at 9:59 AM, Wolfgang Grandegger wrote:
> 
>> Hello,
>>
>> I want to boot PowerPC Linux 2.6.19 on my Icecube board but I didn't
>> succeed yet to get lite5200.dts compiled and an appropriate image 
>> created:
>>
>>    $ dtc -b0 lite5200.dts
>>    DTC: dts->dts  on file "lite5200.dts"
>>    ERROR: Missing /chosen node
>>    Input tree has errors
>>
>> What is the procedure to make and boot an uImage for the U-Boot
>> bootloader. I read about the third argument for bootm but did not
>> understand how to use it.
> 
> How have you booted in the past?  Do you tftp down the images or run 
> from flash?

Yes, at least for development.

> Here's an example assuming you have a kernel image at address $loadaddr 
> and the dtb at $ftaddr
> 
> dtc -b0 -Idts -Odtb -V16 lite5200.dts > lite5200.dtb
> 
> download lite5200.dtb to the system
> 
> => bootm $loadaddr - $fdtaddr

Great, that worked with the additional "-f" option, as suggested by 
Grant. Now I can boot the kernel but BESTCOM and FEC support seem still 
missing. Are there already patches around?

Thanks to all who replied.

Wolfgang.

Re: How to use the device tree for lite5200

[Grant Likely]

On 12/6/06, Wolfgang Grandegger <wg@grandegger.com> wrote:
> Great, that worked with the additional "-f" option, as suggested by
> Grant. Now I can boot the kernel but BESTCOM and FEC support seem still
> missing. Are there already patches around?

They are not in mainline as they are undergoing rework; I've got
working drivers in my tree.  see here:

http://git.secretlab.ca

-- 
Grant Likely, B.Sc. P.Eng.
Secret Lab Technologies Ltd.
grant.likely@secretlab.ca
(403) 399-0195

Re: How to use the device tree for lite5200

[Wolfgang Grandegger]

Grant Likely wrote:
> On 12/6/06, Wolfgang Grandegger <wg@grandegger.com> wrote:
>> Great, that worked with the additional "-f" option, as suggested by
>> Grant. Now I can boot the kernel but BESTCOM and FEC support seem still
>> missing. Are there already patches around?
> 
> They are not in mainline as they are undergoing rework; I've got
> working drivers in my tree.  see here:
> 
> http://git.secretlab.ca

I already used one of your trees, but obviously the wrong one. Now it 
works, that's great.

Thanks a lot.

Wolfgang.

Re: How to use the device tree for lite5200

[Grant Likely]

On 12/6/06, Wolfgang Grandegger <wg@grandegger.com> wrote:
>    $ dtc -b0 lite5200.dts
>    DTC: dts->dts  on file "lite5200.dts"
>    ERROR: Missing /chosen node
>    Input tree has errors

Add the -f flag to dtc to ignore the missing /chosen node error

Use the "-O dtb" flag to output a fdt blob

-- 
Grant Likely, B.Sc. P.Eng.
Secret Lab Technologies Ltd.
grant.likely@secretlab.ca
(403) 399-0195

Re: How to use the device tree for lite5200

[Grant Likely]

On 12/6/06, Grant Likely <grant.likely@secretlab.ca> wrote:
> On 12/6/06, Wolfgang Grandegger <wg@grandegger.com> wrote:
> >    $ dtc -b0 lite5200.dts
> >    DTC: dts->dts  on file "lite5200.dts"
> >    ERROR: Missing /chosen node
> >    Input tree has errors
>
> Add the -f flag to dtc to ignore the missing /chosen node error
>
> Use the "-O dtb" flag to output a fdt blob

Oh, and like Kumar said, you need the -V 0x10 flag to generate the
correct blob version.

g.

-- 
Grant Likely, B.Sc. P.Eng.
Secret Lab Technologies Ltd.
grant.likely@secretlab.ca
(403) 399-0195

Re: How to use the device tree for lite5200

[Jon Loeliger]

On Wed, 2006-12-06 at 10:21, Grant Likely wrote:
> >
> > Add the -f flag to dtc to ignore the missing /chosen node error
> >
> > Use the "-O dtb" flag to output a fdt blob
> 
> Oh, and like Kumar said, you need the -V 0x10 flag to generate the
> correct blob version.

Oh, and, -V 0x10 is the default now with a current
top-of-git DTC too.  :-)

jdl