Porting linux on PPC405

[vneethv]

Hi John,

Thanks for the reply.
I've checked all the comments from you and it seems to be OK in our case.But
still we face the same issue of hanging just after the execution of the
bootwrapper.
when i debugged, stepped using xmd i found the following..

•	Downloaded zImage using xmd
•	Started executing after ‘run’ command
•	Executed the "bootwrapper" part of zImage and unzipped the vmlinux and put
into location 0x0
•	Started executing vmlinux from 0x0
•	Executed the following functions (as per the symbols in the assembly code)
	initial_mmu
	start_here 
In start_here function @ location 0x0000223c the execution is branching to
“early_init”  which is located at 0x019d1b4. But when we ran the step at
this location it goes to 0x00000700 (which is the exception vector for
illegal operation) 
Please refer the attached “xmd_stp.jpg” file and
“start_here_from_vmlinux.dump” file.

Is it because any configuration mistakes ??

Thanks & Regards
Vineeth

http://www.nabble.com/file/p19332811/xmd_stp.JPG xmd_stp.JPG 
http://www.nabble.com/file/p19332811/start_here_from_vmlinux.dump
start_here_from_vmlinux.dump 


John Linn wrote:
> 
> Hi Vineeth,
> 
> I don't directly support that board, but it's similar to the ML405 in
> that it uses a 405 processor.  Since I don't test on that board or any
> V2Pro board, I'm going to tell you my experience on the ML405, a V4
> board.
> 
> See below.
> 
>> -----Original Message-----
>> From: linuxppc-embedded-bounces+john.linn=xilinx.com at ozlabs.org
> [mailto:linuxppc-embedded-
>> bounces+john.linn=xilinx.com at ozlabs.org] On Behalf Of
> vneethv at gmail.com
>> Sent: Thursday, September 04, 2008 12:40 AM
>> To: Linuxppc-embedded at ozlabs.org
>> Subject: Porting linux on PPC405
>> 
>> Hi all,
>> 
>> I am trying to port Linux 2.6 on PPC405 processor.I have
>> EDK 10.1,
>> Xilinx University program board (with Virtex II Pro device)
>> linux kernel from Xilinx git. (git.xilinx.com)
>> Cross Compiler (Croostool)
>> fdt.dts file generated by EDK using with help of Xilinx fdt patch.
>> 
> 
> 
> This is typical of a dts file problem. You should compare the dts file
> to the ml405.dts file that is in the xilinx git tree.
> 
> I just looked at a dts generator issue and see that the following
> property on the processor is wrong as it can be 0 in the generated file.
> This number below is for a system at 300 Mhz.
> 
> timebase-frequency = <300000000>;
> 
>> I could compile the kernel and could generate the zImage.
>> I've downloaded the hardware bit file and then the zImage to the DDR
> SDRAM on the board using
>> Parallel 4 cable.
>> 
>> when i give the RUN command, this is what i get..
>> 
>> 
>> booting virtex
>> memstart=0x0
>> memsize=0x10000000
>> zImage starting: loaded at 0x00400000 (sp: 0x00578f1c)
>> Allocating 0x326564 bytes for kernel ...
>> gunzipping (0x00000000 <- 0x0040c000:0x005772bb)...done 0x3015c8 bytes
>> Linux/PowerPC load: console=ttyS0 ip=on root=/dev/ram
>> Finalizing device tree... flat tree at 0x40ad68
>> 
> 
> Please also verify that you have specified the right amount of RAM for
> the board in the dts file as that can cause a problem.  The memsize
> shows 256 Mbyte, is that really correct?
> 
> The kernel could also be booting, but the console is at the wrong baud
> rate as the UART in the device tree can be set to a baud rate that does
> not agree with the boot args to the kernel.  No baud in the boot arg =
> 9600 baud.
> 
> I have some debug information on the wiki page at
> http://xilinx.wikidot.com/debugging-kernel-boot-problems.
> 
> 
>> The booting process seems to be stopped after this. I the
> bootarguments i've given are,
>> 
>> In dts file,
>> 
>> bootargs = "console=ttyS0 ip=off root=/dev/ram";
>> linux,stdout-path="/plb at 0/serial at 83e00000";
>> 
>> Please let me know if've missed smthing here..!
>> n any clue on the reason why the boor process seems to be hanged here
> !
>> 
>> Thanks in advance,
>> Vineeth
>> 
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