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.

  

 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.