From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <4EFEEF14.3070707@lkmail.de> Date: Sat, 31 Dec 2011 12:16:36 +0100 From: Lorenz Kolb MIME-Version: 1.0 To: "Wang, Junhua H. (NSN - CN/Hangzhou)" Subject: Re: Ask a technical problem happened on PPC board References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------030204040203040409060301" Cc: Linuxppc-dev@lists.ozlabs.org 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. --------------030204040203040409060301 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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 Apart from this: your Linux-Kernel and gcc seem to be pretty outdated.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< error2.txt>> <> > > Br, > > Wang Junhua > > *Wang Junhua (Jonny)*// > > /-----------------------------------------/ > > /LINDX/ > > /DX 200 R&D HZ Area E / > > /MP: +8615967154143/ > > /Seat:4076/ > > > > _______________________________________________ > Linuxppc-dev mailing list > Linuxppc-dev@lists.ozlabs.org > https://lists.ozlabs.org/listinfo/linuxppc-dev --------------030204040203040409060301 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit 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:
Ask a technical problem happened on PPC board

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!

Used kernel: 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)

-----------------------------------------

LINDX

DX 200 R&D HZ Area E

MP: +8615967154143

Seat:4076



_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/linuxppc-dev

--------------030204040203040409060301--