From: Lorenz Kolb <linuxppcemb@lkmail•de>
To: "Wang, Junhua H. (NSN - CN/Hangzhou)" <junhua.h.wang@nsn•com>
Cc: Linuxppc-dev@lists•ozlabs.org
Subject: Re: Ask a technical problem happened on PPC board
Date: Sat, 31 Dec 2011 12:16:36 +0100 [thread overview]
Message-ID: <4EFEEF14.3070707@lkmail.de> (raw)
In-Reply-To: <E2D908A47720CD488BC2AFD11DB6A1B540E9A1@CNBEEXC007.nsn-intra.net>
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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Apart from this: your Linux-Kernel and gcc seem to be pretty outdated.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)*//
>
> /-----------------------------------------/
>
> /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
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prev parent reply other threads:[~2011-12-31 11:16 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-31 4:15 Ask a technical problem happened on PPC board Wang, Junhua H. (NSN - CN/Hangzhou)
2011-12-31 9:01 ` manu
2011-12-31 11:16 ` Lorenz Kolb [this message]
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