From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from p15137414.pureserver.info (matrixvision.de [217.160.213.229]) by ozlabs.org (Postfix) with ESMTP id 98590DDEED for ; Tue, 18 Mar 2008 19:49:38 +1100 (EST) Message-ID: <47DF821B.6090600@matrix-vision.de> Date: Tue, 18 Mar 2008 09:49:31 +0100 From: Andre Schwarz MIME-Version: 1.0 To: Grant Likely Subject: Re: simple MPC5200B system References: <47DD71D0.2010203@matrix-vision.de> In-Reply-To: Content-Type: multipart/alternative; boundary="------------050405060906010102050909" Cc: linux-ppc list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This is a multi-part message in MIME format. --------------050405060906010102050909 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable Grant, I've pulled the latest git and built a mpc5200_simple system with a=20 minimal dts. There's not a single char put on the console .... Grant Likely schrieb: > On Sun, Mar 16, 2008 at 1:15 PM, Andr=E9 Schwarz > wrote: > =20 >> All, >> >> I'm quite stuck in getting our MPC5200B based systems work on 2.6.24+ >> ... maybe someone could give me some hints. >> Up to now the systems have been running on 2.6.19 without any problem= s. >> >> This is what I've done so far : >> >> - get a recent system with 2.6.19 running and keep the toolchain (gcc >> 4.0) including RFS uImage. >> - latest bootloader (u-boot 1.3.2) is running fine with dtb support. >> - Kernel and RFS images are available via bootp/tftp >> - device tree blob seems ok, i.e. u-boot can display the blob and fil= l >> in all clocks correctly. >> - Kernel gets called with Kernel, RFS and dtb on suitable adresses >> (0x100000, 0x600000, 0x5F0000). >> - nothing more happens. It looks like the console isn't working prope= rly >> - maybe worse ... >> =20 > > Can you either halt the processor or reset the board and access memory > after this point? You should see if you can access __log_buf (Look in > System.map for the address and subtract 0xc0000000 to get the physical > address). __log_buf should give you clues about how far booting > progresses. > > =20 (c033d4b4 b __log_buf) yields all zeroes - nothing logged at all. Examining the CPU state with the bdi shows : Target CPU : MPC8280/8220/5200 (Zeppo) Target state : debug mode Debug entry cause : COP halt Current PC : 0xc000552c Current CR : 0x48000042 Current MSR : 0x00009032 Current LR : 0xc00166c0 The program counter shows the adress of "irq_set_virq_count" which has a=20 BUG() macro. Looks like this one evaluates to true. What do you think ? >> The kernel has been build using the "MPC5200 simple" setup. I've adde= d >> our board identifier "mv,mvbluecougar" to the list of supported board= s >> in the "mpc52xx_simple.c" file. This identifier is used in the dtb as >> well of course. This should be enough along with a valid device tree >> blob, isn't it ? Did I miss anything already ? >> =20 > > Yes, this should be enough (on a side note; it should probably be > "matrix-vision,bluecougar" unless of''mv' is your company's stock > ticker symbol). > > =20 >> As far as I did understand by reading the docs it should be possible >> running a general MPC52xx kernel with a custom dtb ? Is this correct = ? >> =20 > > That is correct. > > =20 >> The dts file has already been reduced to a minimum, i.e. only the cpu= , >> pic, xlb and a few nodes like psc1 and psc2 are present. No bestcomm, >> pci, ata or "advanced" features like mtd partitions. All I want to ge= t >> working is the serial console on "/dev/ttyPSC0". >> =20 > > Cheers, > g. > > =20 regards, Andre MATRIX VISION GmbH, Talstra=DFe 16, DE-71570 Oppenweiler - Registergeric= ht: Amtsgericht Stuttgart, HRB 271090 Gesch=E4ftsf=FChrer: Gerhard Thullner, Werner Armingeon, Uwe Furtner --------------050405060906010102050909 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Grant,

I've pulled the latest git and built a mpc5200_simple system with a minimal dts.
There's not a single char put on the console ....



Grant Likely schrieb: 
On Sun, Mar 16, 2008 at 1:15 PM, André Schwarz
<Andre.Schwarz@matrix-vision.de> wrote:
  
All,

 I'm quite stuck in getting our MPC5200B based systems work on 2.6.24+
 ... maybe someone could give me some hints.
 Up to now the systems have been running on 2.6.19 without any problems.

 This is what I've done so far :

 - get a recent system with 2.6.19 running and keep the toolchain (gcc
 4.0) including RFS uImage.
 - latest bootloader (u-boot 1.3.2) is running fine with dtb support.
 - Kernel and RFS images are available via bootp/tftp
 - device tree blob seems ok, i.e. u-boot can display the blob and fill
 in all clocks correctly.
 - Kernel gets called with Kernel, RFS and dtb on suitable adresses
 (0x100000, 0x600000, 0x5F0000).
 - nothing more happens. It looks like the console isn't working properly
 - maybe worse ...
    

Can you either halt the processor or reset the board and access memory
after this point?  You should see if you can access __log_buf (Look in
System.map for the address and subtract 0xc0000000 to get the physical
address).   __log_buf should give you clues about how far booting
progresses.
(c033d4b4 b __log_buf) yields all zeroes - nothing logged at all.

Examining the CPU state with the bdi shows :

    Target CPU        : MPC8280/8220/5200 (Zeppo)
    Target state      : debug mode
    Debug entry cause : COP halt
    Current PC        : 0xc000552c
    Current CR        : 0x48000042
    Current MSR       : 0x00009032
    Current LR        : 0xc00166c0

The program counter shows the adress of "irq_set_virq_count" which has a BUG() macro. Looks like this one evaluates to true.

What do you think ?


  

    
 The kernel has been build using the "MPC5200 simple" setup. I've added
 our board identifier "mv,mvbluecougar" to the list of supported boards
 in the "mpc52xx_simple.c" file. This identifier is used in the dtb as
 well of course. This should be enough along with a valid device tree
 blob, isn't it ? Did I miss anything already ?
    

  

  

Yes, this should be enough (on a side note; it should probably be
"matrix-vision,bluecougar" unless of''mv' is your company's stock
ticker symbol).

  

  

    
 As far as I did understand by reading the docs it should be possible
 running a general MPC52xx kernel with a custom dtb ? Is this correct ?
    

  

  

That is correct.

  

  

    
 The dts file has already been reduced to a minimum, i.e. only the cpu,
 pic, xlb and a few nodes like psc1 and psc2 are present. No bestcomm,
 pci, ata or "advanced" features like mtd partitions. All I want to get
 working is the serial console on "/dev/ttyPSC0".
    

  

  

Cheers,
g.

  





regards,

Andre




MATRIX VISION GmbH, Talstraße 16, DE-71570 Oppenweiler  - Registergericht: Amtsgericht Stuttgart, HRB 271090
Geschäftsführer: Gerhard Thullner, Werner Armingeon, Uwe Furtner





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