Re: Ask a technical problem happened on PPC board

Hi,

first of all: have you tried doing a standalone memory test application?
 From what I see you are using either a Virtex-4FX or Virtex-5FXT 
device, correct?

So I'd highly recommend doing a standalone test prior to booting Linux 
to verify the memory controller timings of the FPGA based SoC.

Apart from this: your Linux-Kernel and gcc seem to be pretty outdated. 
Using a more recent Linux and toolchain often solves a lot of issues (my 
experience, esp. with PowerPC Linux for Xilinx FPGAs).

Regards,

Lorenz
Missing Link Electronics

On 12/31/2011 5:15 AM, Wang, Junhua H. (NSN - CN/Hangzhou) wrote:

HI, all:

Sorry to disturb all of you in the linuxppc-dev mail group. I am a new 
member from linuxppc-dev from China, and I have a very weird problem, 
it have been bothering me for a long time.  I will be very grateful if 
you can help me to analyse it.

  1) Problem description:

a) FRIU(a circuit board) unit is a ppc(powerpc) unit, 256 M bytes Ram, 
bootloader is uboot, kernel linux-2.6.21 filesystem: initramfs

The main problem is that when kernel start up and mount initramfs, run 
the init process(pid 1), when the process(init) write file(20 M bytes) 
to filesystem(initramfs),

sometimes it will find some data modified when check the file's 
contents by read it.

b) I have write a test init process which will write 20 Mbytes 
data(0xFF) to "/TEST0.IMG" and check it's contents. Sometimes, the 
contents will by modified.

c) Here is the test procedure:

Uboot download linux kernel and initramfs --> cmd "bootm" to start 
linux -->after kernel start complete, mount initramfs, run init 
process(pid 1)

--> It will write 20 Mbytes data(0XFF) to 'TEST0.IMG' and check it's 
contents, If there is error, the error data will be printed.

2) Error data:

a) Every time the error happened, a pair of data modified:

first place: 1C 00 FF FF FF FF FF FF 00 00 00 040 80 ...

Second place:FF FF FF FF FF FF 00 A0 ....

Sometimes, there will be 2 pair of data modified.

b) The error happens not very often, but it happens sometime.

3)

Could you give me some advice on how to investigate it or which part 
you think will have problem?

Thanks very much!

Usedkernel: linux-2.6.21<<init process write_read file(20Mbytes) 
error2.txt>> <<init process write_read file(20Mbytes) error.txt>>

Br,

Wang Junhua

*Wang Junhua (Jonny)*//

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