RE: How to move from /ppc/ to /powerpc/

RE: How to move from /ppc/ to /powerpc/

[Claus Gindhart]

Hi Fredrik,

i am running a Kontron board (which has the same SoC as the MPC834x_SYS =
onboard) with the Freescale version of the 2.6.17-Kernel, and its =
working well.
Together with my update from 2.6.13 i migrated from arch/ppc to =
arch/powerpc.

The most important modification is (besides changing the ARCH env from =
ppc to powerpc), that your U-Boot has to provide the flattened device =
tree.
Please read Documentation/powerpc/booting-without-of.txt
within the kernel source tree.

So, its mainly an issue for the Bootloader, because many of the board =
dependent definitions is now migrated to the flattened device tree.
The U-Boot, which comes with the Freescale LTIB, supports flattened =
device tree, so the first step is updating U-Boot. Then, the kernel will =
work, if you compile it with ARCH=3Dpowerpc setting.

--=20
Mit freundlichen Gruessen / Best regards

Claus Gindhart
SW R&D
Kontron Modular Computers
phone :++49 (0)8341-803-374
mailto:claus.gindhart@kontron-modular.com
http://www.kontron.com

-----BEGIN GEEK CODE BLOCK-----
  Version: 3.1
  GU d- s++:>++:+ a+ C++$ !U !P L++>$ E-- W+(-) N- o?
  K? w !O !M V !PS PE- Y+ PGP+ t 5? X R* tv- b+ DI+++
  D-- G e++> h--- !r x+++
------END GEEK CODE BLOCK------
=20



-----Original Message-----
From: linuxppc-embedded-bounces+claus.gindhart=3Dkontron.com@ozlabs.org
[mailto:linuxppc-embedded-bounces+claus.gindhart=3Dkontron.com@ozlabs.org=
]
On Behalf Of Fredrik Roubert
Sent: Dienstag, 12. September 2006 17:33
To: linuxppc-embedded@ozlabs.org
Subject: How to move from /ppc/ to /powerpc/


Hi!

I have a custom board on which I currently run Linux 2.6.18-rc6
configured for MPC834x_SYS in the /ppc/ tree, which just a few minor
changes. Now I'm interested to move to using the /powerpc/ source tree
instead, but I can't figure out exactly what steps are necessary to do
this.

Does anyone run a MPC834x_SYS built with ARCH=3Dpowerpc?

I boot the board with U-Boot (version 1.1.4, customized), and I assume
that I need to add some stuff for this new device tree thing, but I
can't figure out exactly what the kernel will expect.

Does anyone have some pointers on how to do this?

Cheers // Fredrik Roubert

--=20
Visserij 192  |  +32 473 344527 / +46 708 776974
BE-9000 Gent  |  http://www.df.lth.se/~roubert/

Re: How to move from /ppc/ to /powerpc/

[Fredrik Roubert]

[-- Attachment #1: Type: text/plain, Size: 478 bytes --]

On Wed 13 Sep 08:58 CEST 2006, Claus Gindhart wrote:

> i am running a Kontron board (which has the same SoC as the MPC834x_SYS
> onboard) with the Freescale version of the 2.6.17-Kernel, and its
> working well. Together with my update from 2.6.13 i migrated from
> arch/ppc to arch/powerpc.

Interesting! What dts file are you using?

Cheers // Fredrik Roubert

-- 
Visserij 192  |  +32 473 344527 / +46 708 776974
BE-9000 Gent  |  http://www.df.lth.se/~roubert/

[-- Attachment #2: Type: application/pgp-signature, Size: 303 bytes --]

RE: How to move from /ppc/ to /powerpc/

[Joakim Tjernlund]

 > I tried compiling it like this:
>=20
> $ dtc -f -I dts -O dtb mpc8349emds.dts > devices.dtb
> DTC: dts->dtb  on file "mpc8349emds.dts"
> Warning: No cpu has "linux,boot-cpu" property
> ERROR: Missing /chosen node
> Input tree has errors

You need to add -V 0x10 to dtc as well.

RE: How to move from /ppc/ to /powerpc/

[Claus Gindhart]

Hi Fredrik,

our Kontron board is not identical to the SYS-Board, but has the same =
processor/chipset.
We are also not using U-Boot, but the Kontron NetBootloader, and our FDT =
implemtation does not use the dts. We have implemented this from scratch =
using the available documents regarding the required data to be passed.
For this reason, this will not be helpful for you.

Best regards,
Claus


-----Original Message-----
From: linuxppc-embedded-bounces+claus.gindhart=3Dkontron.com@ozlabs.org
[mailto:linuxppc-embedded-bounces+claus.gindhart=3Dkontron.com@ozlabs.org=
]
On Behalf Of Fredrik Roubert
Sent: Mittwoch, 13. September 2006 15:30
To: linuxppc-embedded@ozlabs.org
Subject: Re: How to move from /ppc/ to /powerpc/


On Wed 13 Sep 08:58 CEST 2006, Claus Gindhart wrote:

> i am running a Kontron board (which has the same SoC as the =
MPC834x_SYS
> onboard) with the Freescale version of the 2.6.17-Kernel, and its
> working well. Together with my update from 2.6.13 i migrated from
> arch/ppc to arch/powerpc.

Interesting! What dts file are you using?

Cheers // Fredrik Roubert

--=20
Visserij 192  |  +32 473 344527 / +46 708 776974
BE-9000 Gent  |  http://www.df.lth.se/~roubert/

How to move from /ppc/ to /powerpc/

[Fredrik Roubert]

[-- Attachment #1: Type: text/plain, Size: 737 bytes --]

Hi!

I have a custom board on which I currently run Linux 2.6.18-rc6
configured for MPC834x_SYS in the /ppc/ tree, which just a few minor
changes. Now I'm interested to move to using the /powerpc/ source tree
instead, but I can't figure out exactly what steps are necessary to do
this.

Does anyone run a MPC834x_SYS built with ARCH=powerpc?

I boot the board with U-Boot (version 1.1.4, customized), and I assume
that I need to add some stuff for this new device tree thing, but I
can't figure out exactly what the kernel will expect.

Does anyone have some pointers on how to do this?

Cheers // Fredrik Roubert

-- 
Visserij 192  |  +32 473 344527 / +46 708 776974
BE-9000 Gent  |  http://www.df.lth.se/~roubert/

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Re: How to move from /ppc/ to /powerpc/

[Kim Phillips]

On Tue, 12 Sep 2006 17:33:16 +0200
Fredrik Roubert <roubert@df.lth.se> wrote:

> Hi!
> 
> I have a custom board on which I currently run Linux 2.6.18-rc6
> configured for MPC834x_SYS in the /ppc/ tree, which just a few minor
> changes. Now I'm interested to move to using the /powerpc/ source tree
> instead, but I can't figure out exactly what steps are necessary to do
> this.
> 
> Does anyone run a MPC834x_SYS built with ARCH=powerpc?
> 
yes

> I boot the board with U-Boot (version 1.1.4, customized), and I assume
> that I need to add some stuff for this new device tree thing, but I
> can't figure out exactly what the kernel will expect.

the kernel expects a pointer to a device tree instead of a bd_t.  The 8349EMDS device tree source is now in linux/arch/powerpc/boot/dts.  You'll need the device tree compiler (dtc) from jdl.com to build your flat device tree binary (dtb; what the kernel expects).

> 
> Does anyone have some pointers on how to do this?
> 
Matt's u-boot patches address the issue well for 85xx, they are straightforward to adapt to 83xx:

http://sourceforge.net/mailarchive/forum.php?thread_id=15518792&forum_id=12898

they allow you to tftp the dtb into mem, and "bootm ${loadaddr} - ${oftaddr}" to start an ARCH=powerpc kernel. 

> Cheers // Fredrik Roubert

Kim

Re: How to move from /ppc/ to /powerpc/

[Jon Loeliger]

On Tue, 2006-09-12 at 10:58, Kim Phillips wrote:

> > I boot the board with U-Boot (version 1.1.4, customized), and I assume
> > that I need to add some stuff for this new device tree thing, but I
> > can't figure out exactly what the kernel will expect.
> 
> the kernel expects a pointer to a device tree instead of a bd_t.
> The 8349EMDS device tree source is now in linux/arch/powerpc/boot/dts.
> You'll need the device tree compiler (dtc) from jdl.com to build
> your flat device tree binary (dtb; what the kernel expects).

And you should read:

    linux-2.6/Documentation/powerpc/booting-without-of.txt

jdl

Re: How to move from /ppc/ to /powerpc/

[Fredrik Roubert]

[-- Attachment #1: Type: text/plain, Size: 1192 bytes --]

On Tue 12 Sep 17:58 CEST 2006, Kim Phillips wrote:

> The 8349EMDS device tree source is now in linux/arch/powerpc/boot/dts.

Is that the right dts to use for a MPC8349SYS board?

I tried compiling it like this:

$ dtc -f -I dts -O dtb mpc8349emds.dts > devices.dtb
DTC: dts->dtb  on file "mpc8349emds.dts"
Warning: No cpu has "linux,boot-cpu" property
ERROR: Missing /chosen node
Input tree has errors

Is that really correct? Should I invoke dtc in some other way or modify
the dts or use some other dts file?

> Matt's u-boot patches address the issue well for 85xx, they are
> straightforward to adapt to 83xx:
>
> http://sourceforge.net/mailarchive/forum.php?thread_id=15518792&forum_id=12898
>
> they allow you to tftp the dtb into mem, and "bootm ${loadaddr} -
> ${oftaddr}" to start an ARCH=powerpc kernel.

OK, I've adapted and applied those patches now. However, when I try to
boot with the dtd I generated above, then the kernel just hangs. For
now, I assume that is because of errors in the dtd and not in u-boot ...

Cheers // Fredrik Roubert

-- 
Visserij 192  |  +32 473 344527 / +46 708 776974
BE-9000 Gent  |  http://www.df.lth.se/~roubert/

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Re: How to move from /ppc/ to /powerpc/

[Jon Loeliger]

On Wed, 2006-09-13 at 08:28, Fredrik Roubert wrote:
> On Tue 12 Sep 17:58 CEST 2006, Kim Phillips wrote:
> 
> > The 8349EMDS device tree source is now in linux/arch/powerpc/boot/dts.
> 
> Is that the right dts to use for a MPC8349SYS board?
> 
> I tried compiling it like this:
> 
> $ dtc -f -I dts -O dtb mpc8349emds.dts > devices.dtb
> DTC: dts->dtb  on file "mpc8349emds.dts"
> Warning: No cpu has "linux,boot-cpu" property
> ERROR: Missing /chosen node
> Input tree has errors
> 
> Is that really correct? Should I invoke dtc in some other way or modify
> the dts or use some other dts file?

You must use the -V 16 flag too.  Likely, -b 0 as well.

jdl

Re: How to move from /ppc/ to /powerpc/

[Matthew McClintock]

On Wed, 2006-09-13 at 15:28 +0200, Fredrik Roubert wrote:
> OK, I've adapted and applied those patches now. However, when I try to
> boot with the dtd I generated above, then the kernel just hangs. For
> now, I assume that is because of errors in the dtd and not in
> u-boot ...
> 

Could you supply us with the output form u-boot before starting the
kernel?

-Matthew

Re: How to move from /ppc/ to /powerpc/

[Fredrik Roubert]

[-- Attachment #1.1: Type: text/plain, Size: 1614 bytes --]

Hi!

Now I've written an adapted DTS (see attachment) for my custom board,
based on the mpc8349emds.dts from the kernel source. I use Matthew
McClintock's patches to U-Boot to load the kernel with the DTD.

I compile the DTS using the following command line:

dtc -V 16 -I dts -O dtb px5500.dts > px5500.dtb

I've compiled an unmodified 2.6.18 kernel configured for powerpc and the
MPC834x SYS platform. The system boots OK and I can log in using SSH.
However, I have problems with the serial console. During boot, I get the
following printout:

Booting using flat device tree at 0x400000
Using MPC834x SYS machine description
Linux version 2.6.18 (frer@milou) (gcc version 4.1.1) #1 PREEMPT Thu Sep 21 17:31:30 CEST 2006
setup_arch: bootmem
mpc834x_sys_setup_arch()
Found MPC83xx PCI host bridge at 0x00000000ff408500. Firmware bus number: 0->0
arch: exit
Built 1 zonelists.  Total pages: 32768
Kernel command line: root=/dev/nfs rw nfsroot=150.158.215.227:/home/rootfs/dev-ds ip=150.158.211.83:150.158.215.227:150.158.212.1:255.255.248.0:dev-ds:eth0:off console=ttyS0,115200 console=ttyS0,115200 rtc-x1205.force=0,0x6f
IPIC (128 IRQ sources) at fdefc700
PID hash table entries: 1024 (order: 10, 4096 bytes)

The serial console stops working after the call to console_init().

Except for the serial console, the system seems to be running fine. Does
anyone have any ideas about what might be wrong and how I could try to
track this problem down?

Cheers // Fredrik Roubert

-- 
Visserij 192  |  +32 473 344527 / +46 708 776974
BE-9000 Gent  |  http://www.df.lth.se/~roubert/

[-- Attachment #1.2: px5500.dts --]
[-- Type: text/plain, Size: 3765 bytes --]


/ {
	model = "PX5500";
	#address-cells = <1>;
	#size-cells = <1>;

	cpus {
		#cpus = <1>;
		#address-cells = <1>;
		#size-cells = <0>;

		PowerPC,8349@0 {
			device_type = "cpu";
			reg = <0>;
			d-cache-line-size = <20>;	// 32 bytes
			i-cache-line-size = <20>;	// 32 bytes
			d-cache-size = <8000>;		// L1, 32K
			i-cache-size = <8000>;		// L1, 32K
			timebase-frequency = <0>;	// from bootloader
			bus-frequency = <0>;		// from bootloader
			clock-frequency = <0>;		// from bootloader
			32-bit;
			linux,boot-cpu;
		};
	};

	memory {
		device_type = "memory";
		reg = <00000000 08000000>;		// 128MB at 0
	};

	chosen {
		name = "chosen";
		linux,platform = <00000600>;
		linux,stdout-path = "/soc8349@ff400000/serial@4500";
		bootargs = "root=/dev/nfs rw nfsroot=150.158.215.227:/home/rootfs/dev-ds ip=150.158.211.83:150.158.215.227:150.158.212.1:255.255.248.0:dev-ds:eth0:off console=ttyS0,115200 console=ttyS0,115200 rtc-x1205.force=0,0x6f";
	};

	soc8349@ff400000 {
		#address-cells = <1>;
		#size-cells = <1>;
		#interrupt-cells = <2>;
		device_type = "soc";
		ranges = <0 ff400000 00100000>;
		reg = <ff400000 00000200>;
		bus-frequency = <0>;

		i2c@3000 {
			device_type = "i2c";
			compatible = "fsl-i2c";
			reg = <3000 100>;
			interrupts = <e 8>;
			interrupt-parent = <700>;
			dfsrr;
		};

		mdio@24520 {
			device_type = "mdio";
			compatible = "gianfar";
			reg = <24520 20>;
			#address-cells = <1>;
			#size-cells = <0>;
			linux,phandle = <24520>;
			ethernet-phy@0 {
				linux,phandle = <2452000>;
				interrupt-parent = <700>;
				interrupts = <11 2>;
				reg = <1>;
				device_type = "ethernet-phy";
			};
			ethernet-phy@1 {
				linux,phandle = <2452001>;
				interrupt-parent = <700>;
				interrupts = <12 2>;
				reg = <3>;
				device_type = "ethernet-phy";
			};
		};

		ethernet@24000 {
			device_type = "network";
			model = "TSEC";
			compatible = "gianfar";
			reg = <24000 1000>;
			address = [ 00 00 00 00 00 00 ];
			local-mac-address = [ 00 11 00 11 ff a1 ];
			interrupts = <20 8 21 8 22 8>;
			interrupt-parent = <700>;
			phy-handle = <2452000>;
		};

		ethernet@25000 {
			#address-cells = <1>;
			#size-cells = <0>;
			device_type = "network";
			model = "TSEC";
			compatible = "gianfar";
			reg = <25000 1000>;
			address = [ 00 00 00 00 00 00 ];
			local-mac-address = [ 00 11 00 11 ff a2 ];
			interrupts = <23 8 24 8 25 8>;
			interrupt-parent = <700>;
			phy-handle = <2452001>;
		};

		serial@4500 {
			device_type = "serial";
			compatible = "ns16550";
			reg = <4500 100>;
			clock-frequency = <0>;
			interrupts = <9 8>;
			interrupt-parent = <700>;
		};

		serial@4600 {
			device_type = "serial";
			compatible = "ns16550";
			reg = <4600 100>;
			clock-frequency = <0>;
			interrupts = <a 8>;
			interrupt-parent = <700>;
		};

		pci@8500 {
			interrupt-map-mask = <f800 0 0 7>;
			interrupt-map = <
					/* IDSEL 0x0e */
					 7000 0 0 1 700 17 8
					 7000 0 0 2 700 00 8
					 7000 0 0 3 700 00 8
					 7000 0 0 4 700 00 8>;
			interrupt-parent = <700>;
			interrupts = <42 8>;
			bus-range = <0 0>;
			ranges = <02000000 0 a0000000 a0000000 0 10000000
				  42000000 0 80000000 80000000 0 10000000
				  01000000 0 00000000 e2000000 0 00100000>;
			clock-frequency = <3f940aa>;
			#interrupt-cells = <1>;
			#size-cells = <2>;
			#address-cells = <3>;
			reg = <8500 100>;
			compatible = "83xx";
			device_type = "pci";
		};

		/* IPIC
		 * interrupts cell = <intr #, sense>
		 * sense values match linux IORESOURCE_IRQ_* defines:
		 * sense == 8: Level, low assertion
		 * sense == 2: Edge, high-to-low change
		 */
		pic@700 {
			linux,phandle = <700>;
			interrupt-controller;
			#address-cells = <0>;
			#interrupt-cells = <2>;
			reg = <700 100>;
			built-in;
			device_type = "ipic";
		};
	};
};


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Re: How to move from /ppc/ to /powerpc/

[Matthew McClintock]

On Thu, 2006-09-21 at 18:08 +0200, Fredrik Roubert wrote:
>         chosen {
>                 name = "chosen";
>                 linux,platform = <00000600>;
>                 linux,stdout-path = "/soc8349@ff400000/serial@4500";
>                 bootargs = "root=/dev/nfs rw
> nfsroot=150.158.215.227:/home/rootfs/dev-ds
> ip=150.158.211.83:150.158.215.227:150.158.212.1:255.255.248.0:dev-ds:eth0:off console=ttyS0,115200 console=ttyS0,115200 rtc-x1205.force=0,0x6f";
>         };
> 

Fredrik,

It looks like you already have your chosen node in your DTS file. With
my u-boot patches the appropriate chosen node is added to the flat tree
based off the u-boot environment.

-Matthew

Re: How to move from /ppc/ to /powerpc/

[Fredrik Roubert]

[-- Attachment #1: Type: text/plain, Size: 945 bytes --]

On Mon 25 Sep 18:49 CEST 2006, Matthew McClintock wrote:

> It looks like you already have your chosen node in your DTS file. With
> my u-boot patches the appropriate chosen node is added to the flat tree
> based off the u-boot environment.

Ah, that's true, in ft_setup(), I didn't see that. Thanks! (I'd been
thinking about how the command line should be passed from U-Boot, but
decided to postpone that investigation until I solved the serial console
problem.)

However, the code in ft_setup() doesn't assign "linux,stdout-path", so
if I remove the chosen node from my DTS, then I get no print-out on the
serial console at all. (But the rest of the system appears to run fine
and I can log in using SSH.) Can this be a clue to someone as to what
could be the problem with my serial console?

Cheers // Fredrik Roubert

-- 
Visserij 192  |  +32 473 344527 / +46 708 776974
BE-9000 Gent  |  http://www.df.lth.se/~roubert/

[-- Attachment #2: Type: application/pgp-signature, Size: 303 bytes --]

Re: How to move from /ppc/ to /powerpc/

[Matthew McClintock]

On Mon, 2006-09-25 at 19:17 +0200, Fredrik Roubert wrote:
> On Mon 25 Sep 18:49 CEST 2006, Matthew McClintock wrote:
> 
> > It looks like you already have your chosen node in your DTS file. With
> > my u-boot patches the appropriate chosen node is added to the flat tree
> > based off the u-boot environment.
> 
> Ah, that's true, in ft_setup(), I didn't see that. Thanks! (I'd been
> thinking about how the command line should be passed from U-Boot, but
> decided to postpone that investigation until I solved the serial console
> problem.)
> 
> However, the code in ft_setup() doesn't assign "linux,stdout-path", so
> if I remove the chosen node from my DTS, then I get no print-out on the
> serial console at all. (But the rest of the system appears to run fine
> and I can log in using SSH.) Can this be a clue to someone as to what
> could be the problem with my serial console?
> 

>From u-boot/common/ft_build.c:

#ifdef OF_STDOUT_PATH
        ft_prop_str(&cxt, "linux,stdout-path", OF_STDOUT_PATH);
#endif

There is a define for adding that to the /chosen node. Add this to your
u-boot include file and the console should show up.

Good Luck.

-Matthew

Re: How to move from /ppc/ to /powerpc/

[Fredrik Roubert]

[-- Attachment #1: Type: text/plain, Size: 680 bytes --]

On Mon 25 Sep 19:20 CEST 2006, Matthew McClintock wrote:

> #ifdef OF_STDOUT_PATH
>         ft_prop_str(&cxt, "linux,stdout-path", OF_STDOUT_PATH);
> #endif

Great! I had missed those lines (while manually applying your patches to
my own modified U-Boot 1.1.4 sources) ...

Now I'm back to the state of last Thursday (except for getting rid of
the unnecessary chosen node and getting bootargs passed nicely), which
means that the serial console initially works, but stops working after
the call to console_init() in start_kernel().

Cheers // Fredrik Roubert

-- 
Visserij 192  |  +32 473 344527 / +46 708 776974
BE-9000 Gent  |  http://www.df.lth.se/~roubert/

[-- Attachment #2: Type: application/pgp-signature, Size: 303 bytes --]

Re: How to move from /ppc/ to /powerpc/

[Matthew McClintock]

On Mon, 2006-09-25 at 19:41 +0200, Fredrik Roubert wrote:

> Now I'm back to the state of last Thursday (except for getting rid of
> the unnecessary chosen node and getting bootargs passed nicely), which
> means that the serial console initially works, but stops working after
> the call to console_init() in start_kernel().

Do you have all the other OF related defines in your u-boot config
file? 

#define OF_CPU                  "PowerPC,8540@0"
#define OF_SOC                  "soc8540@e0000000"
#define OF_TBCLK                (bd->bi_busfreq / 8)
#define OF_STDOUT_PATH          "/soc8540@e0000000/serial@4500"

Maybe you are not properly setting up entries in the flat device tree
passed to the kernel. So when the kernel takes over and re-initializes
the serial port the speed is all messed up.

Can you verify the flat device tree passed to the kernel is correct?
Specifically these properties:

                timebase-frequency = <0>;       // from bootloader
                bus-frequency = <0>;            // from bootloader
                clock-frequency = <0>;          // from bootloader

-Matthew

Re: How to move from /ppc/ to /powerpc/

[Fredrik Roubert]

[-- Attachment #1: Type: text/plain, Size: 827 bytes --]

On Mon 25 Sep 20:59 CEST 2006, Matthew McClintock wrote:

> Can you verify the flat device tree passed to the kernel is correct?
> Specifically these properties:
>
>                 timebase-frequency = <0>;       // from bootloader
>                 bus-frequency = <0>;            // from bootloader
>                 clock-frequency = <0>;          // from bootloader

Right on target! These values were not set up correctly, and after
fixing that I can now boot an unmodified powerpc 2.6.18 kernel.

Thank you so very much!

Are your flat device tree patches going to be included in the mainline
U-Boot in the future, or is it likely that some other method will be
used?

Cheers // Fredrik Roubert

-- 
Visserij 192  |  +32 473 344527 / +46 708 776974
BE-9000 Gent  |  http://www.df.lth.se/~roubert/

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Re: How to move from /ppc/ to /powerpc/

[Fredrik Roubert]

[-- Attachment #1: Type: text/plain, Size: 645 bytes --]

On Wed 13 Sep 15:28 CEST 2006, Fredrik Roubert wrote:

> > Matt's u-boot patches address the issue well for 85xx, they are
> > straightforward to adapt to 83xx:
> >
> > http://sourceforge.net/mailarchive/forum.php?thread_id=15518792&forum_id=12898
>
> OK, I've adapted and applied those patches now.

In case someone else also is interested in using Matt's flat device tree
patches with U-Boot 1.1.4, I've posted my backport of the relevant parts
of the patch to the u-boot-users mailing list now.

Cheers // Fredrik Roubert

-- 
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Re: How to move from /ppc/ to /powerpc/

[Vitaly Bordug]

On Tue, 12 Sep 2006 17:33:16 +0200
Fredrik Roubert <roubert@df.lth.se> wrote:

> Hi!
> 
> I have a custom board on which I currently run Linux 2.6.18-rc6
> configured for MPC834x_SYS in the /ppc/ tree, which just a few minor
> changes. Now I'm interested to move to using the /powerpc/ source tree
> instead, but I can't figure out exactly what steps are necessary to do
> this.
> 
> Does anyone run a MPC834x_SYS built with ARCH=powerpc?
> 
Actually it was the first ppc board actually moved over to powerpc.

> I boot the board with U-Boot (version 1.1.4, customized), and I assume
> that I need to add some stuff for this new device tree thing, but I
> can't figure out exactly what the kernel will expect.
You'll need to replace u-boot with custom one that is able to deal with dts. There are 2 ways ATM - use bootm dts approach, which could load device tree from external source, and built-in that makes in compiled into u-boot.

Both patches against u-boot should be searched in u-boot mailing list archives. For 83xx both way work just fine.


-- 
Sincerely, 
Vitaly