2.6 kernel hangs after loading device tree

2.6 kernel hangs after loading device tree

[charanya venkatraman]

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Hi all

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2.6 kernel hangs after loading device tree

[charanya venkatraman]

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Hi all
       Sorry about the previous mail.Got sent  by mistake.

Iam using the 2.6.22.5 kernel on MPC 8560 and MPC8540 on my custom
board.Mykernel hangs after loading the device tree in both the
processors .There is
no output on the serial port after loading the device tree.Am using U-boot
1.2.0 as the bootloader.After enabling debug in u-boot i could see that the
control is getting transferred to the kernel after which it hangs.Earlier i
tried using 2.6.21 which also hangs at the same point.The config files used
were MPC8540ADS_defconfig and MPC8560ADS_defconfig under powerpc directory.
The changes that were made to the device tree are:
1.The reg and ranges properties of the soc node have been changed to account
for the change in CCSRBAR of my board.
2.Removed the PCI,mdio nodes and ethernet nodes since i dont need support
for these as of now.

I have tried the following console arguments:
MPC8540: bootargs root=/dev/ram rw console=ttyS0,115200
MPC8560:bootargs root=/dev/ram rw console=ttyCPM0,115200

Any help on this issue??

Thanks.
Charanya.

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Re: 2.6 kernel hangs after loading device tree

[abhi_linux]

Hello
Did u get a solution to this? I have similar issues. How do u enable
debugging in UBoot?
Thanks

charanya venkatraman wrote:
> 
> Hi all
>        Sorry about the previous mail.Got sent  by mistake.
> 
> Iam using the 2.6.22.5 kernel on MPC 8560 and MPC8540 on my custom
> board.Mykernel hangs after loading the device tree in both the
> processors .There is
> no output on the serial port after loading the device tree.Am using U-boot
> 1.2.0 as the bootloader.After enabling debug in u-boot i could see that
> the
> control is getting transferred to the kernel after which it hangs.Earlier
> i
> tried using 2.6.21 which also hangs at the same point.The config files
> used
> were MPC8540ADS_defconfig and MPC8560ADS_defconfig under powerpc
> directory.
> The changes that were made to the device tree are:
> 1.The reg and ranges properties of the soc node have been changed to
> account
> for the change in CCSRBAR of my board.
> 2.Removed the PCI,mdio nodes and ethernet nodes since i dont need support
> for these as of now.
> 
> I have tried the following console arguments:
> MPC8540: bootargs root=/dev/ram rw console=ttyS0,115200
> MPC8560:bootargs root=/dev/ram rw console=ttyCPM0,115200
> 
> Any help on this issue??
> 
> Thanks.
> Charanya.
> 
> _______________________________________________
> Linuxppc-embedded mailing list
> Linuxppc-embedded@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-embedded
> 

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Re: 2.6 kernel hangs after loading device tree

[Clemens Koller]

 > charanya venkatraman wrote:
 >> Hi all
 >>        Sorry about the previous mail.Got sent  by mistake.
 >>
 >> Iam using the 2.6.22.5 kernel on MPC 8560 and MPC8540 on my custom
 >> board.Mykernel hangs after loading the device tree in both the
 >> processors. There is
 >> no output on the serial port after loading the device tree.

 >> I have tried the following console arguments:
 >> MPC8540: bootargs root=/dev/ram rw console=ttyS0,115200
 >> MPC8560:bootargs root=/dev/ram rw console=ttyCPM0,115200
 >>
 >> Any help on this issue??

Maybe your problem is related to... See the thread at:
http://ozlabs.org/pipermail/linuxppc-embedded/2007-November/028968.html
(I use Paulus' git tree.)

Regards,

Clemens Koller
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Tel.089-741518-50
Fax 089-741518-19
http://www.anagramm-technology.com

Re: 2.6 kernel hangs after loading device tree

[charanya venkatraman]

Hi,
      I got a solution to this.The problem was with the current speed
parameter in the DTS,as stated.You need to explicity specify the
speed.It doesnot get filled in from U-boot.You can also probabaly
check the kernel log buf to see what values are set for these
parameters.Anyways,changing the current speed made it work me and my
2.6 kernel is now up.

Thanks.
Charanya.



> Date: Mon, 19 Nov 2007 16:08:03 -0800 (PST)
> From: abhi_linux <seema.pm@gmail.com>
> Subject: Re: 2.6 kernel hangs after loading device tree
> To: linuxppc-embedded@ozlabs.org
> Message-ID: <13848328.post@talk.nabble.com>
> Content-Type: text/plain; charset=us-ascii
>
>
> Hello
> Did u get a solution to this? I have similar issues. How do u enable
> debugging in UBoot?
> Thanks
>
> charanya venkatraman wrote:
> >
> > Hi all
> >        Sorry about the previous mail.Got sent  by mistake.
> >
> > Iam using the 2.6.22.5 kernel on MPC 8560 and MPC8540 on my custom
> > board.Mykernel hangs after loading the device tree in both the
> > processors .There is
> > no output on the serial port after loading the device tree.Am using U-boot
> > 1.2.0 as the bootloader.After enabling debug in u-boot i could see that
> > the
> > control is getting transferred to the kernel after which it hangs.Earlier
> > i
> > tried using 2.6.21 which also hangs at the same point.The config files
> > used
> > were MPC8540ADS_defconfig and MPC8560ADS_defconfig under powerpc
> > directory.
> > The changes that were made to the device tree are:
> > 1.The reg and ranges properties of the soc node have been changed to
> > account
> > for the change in CCSRBAR of my board.
> > 2.Removed the PCI,mdio nodes and ethernet nodes since i dont need support
> > for these as of now.
> >
> > I have tried the following console arguments:
> > MPC8540: bootargs root=/dev/ram rw console=ttyS0,115200
> > MPC8560:bootargs root=/dev/ram rw console=ttyCPM0,115200
> >
> > Any help on this issue??
> >
> > Thanks.
> > Charanya.