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maser | 1 Apr 2008 06:22
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Is a JFFS2 image needed for dataflash ?


Per this:

http://mailman.uclinux.org/pipermail/uclinux-dev/2003-January/014455.html

It looks like a JFFS2 FS is created on the fly on the
following commands: 

eraseall /dev/mtd0
mount -t jffs /dev/mtdblock0 /mnt
cp /usr/ls /mnt

If the JFFS2 FS is created on the fly on mounting to a
dataflash partition, why do we need to invoke the
mkfs.jffs2 utility to make a JFFS2 image for a
dataflash such as the AT45DBxxx?

The sysinit script could have something on the lines
of this :

/bin/mount -t jffs2 /dev/mtdblock2 /mnt

Thanks,
iyer

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maser | 1 Apr 2008 06:26
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Is an erased partition on a dataflash identical to a jffs2 image ?


Per this :

Also, with respect to the above link,
http://mailman.uclinux.org/pipermail/uclinux-dev/2003-January/014455.html,
is an erased partition identical to a jffs2 image ? 

Thanks,
iyer

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ffileppo | 1 Apr 2008 08:49
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Problems mounting JFFS2 (linux 2.6.22.6)

Hi,

I'm running kernel 2.6.22.6 on a PXA270 based board (custom Mainstone).

I'm having some issue trying to mount JFFS2

This is the command I use to build my jffs2 filesystem (starting from a working ramdisk placed in /mnt/):

mkfs.jffs2 -n -l -e 0x20000 --pad=0x01000000 -s 0x8000 -d /mnt/ -o rootfs.img

(I'm using latest release of mkfs.jffs2)

After flashing the image, I try to mount jffs2 filesystem on my embedded system:

mount -t jffs2 /dev/mtdblock2 /mnt

and I get:

kernel BUG at arch/arm/mm/consistent.c:488!                                          
Unable to handle kernel NULL pointer dereference at virtual address 00000000                                                                           
pgd = c0004000             
[00000000] *pgd=00000000                       
Internal error: Oops: 817 [#1]                             
Modules linked in:                 
CPU: 0    Not tainted  (2.6.22.6 #54)                                    
PC is at __bug+0x20/0x2c                       
LR is at 0x60000013                  
pc : [<c0025288>]    lr : [<60000013>]    psr: 60000013                                                      
sp : c77d7d20  ip : c0216bf8  fp : c77d7d2c                                          
r10: 00000080  r9 : c77fcfb8  r8 : 000fa000
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Martin Creutziger | 1 Apr 2008 09:36

Re: JFFS2: Kernel 2.6.24.2 Ooops during excessive write test

On Mon, 2008-03-31 at 19:23 +0400, Damir Shayhutdinov wrote:
> Hi!
> 
> 2008/3/31, Martin Creutziger wrote:
> >  I did some searching in the archive already and did not find anything,
> >  so I just post it myself in the hope that somebody can help me.
> >
> >  I am doing some excessive write tests on a PPC405EP running kernel
> >  2.6.24.2 at the moment. At irregular intervals, the "space accounting
> >  superblock info" gets "screwed" and I'd like to know why this happens
> >  and if it is fixable. And if not, that information might help me to
> >  decide whether or not this affects the planned application.
> >
> >  Thanks for the help,
> 
> Can you test this patch with your system?
> http://lists.infradead.org/pipermail/linux-mtd/2007-November/019866.html

Yes, will do that. I also activated verbose info on BUG() now, maybe
that gives additional information in case it goes wrong again.

I have to add, however, that it can take up to a week until the oops
occurs again, so be patient :)

Thanks so far,
Martin

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Laurent Pinchart | 1 Apr 2008 10:47

Re: [PATCHv2] powerpc: Describe memory-mapped RAM&ROM chips OF bindings

On Monday 31 March 2008 19:06, Sergei Shtylyov wrote:
> Hello.
> 
> Laurent Pinchart wrote:
> 
> > Signed-off-by: Laurent Pinchart <laurentp <at> cse-semaphore.com>
> > ---
> >  Documentation/powerpc/booting-without-of.txt |   13 ++++++++++++-
> >  1 files changed, 12 insertions(+), 1 deletions(-)
> > 
> > diff --git a/Documentation/powerpc/booting-without-of.txt 
b/Documentation/powerpc/booting-without-of.txt
> > index 7b4e8a7..3e1963b 100644
> > --- a/Documentation/powerpc/booting-without-of.txt
> > +++ b/Documentation/powerpc/booting-without-of.txt
> >  <at>  <at>  -57,7 +57,8  <at>  <at>  Table of Contents
> >        n) 4xx/Axon EMAC ethernet nodes
> >        o) Xilinx IP cores
> >        p) Freescale Synchronous Serial Interface
> > -	  q) USB EHCI controllers
> > +      q) USB EHCI controllers
> > +      r) Memory-mapped RAM & ROM
> 
>     Memory-mapped RA/RO Memory again? Should better drop this. :-)

You're quite picky, aren't you ? :-)

I suppose "Memory-mapped RA & RO" won't be accepted, so what about "Auxiliary 
RAM & ROM" ?
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Trent Piepho | 1 Apr 2008 11:18
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Re: [PATCHv2] powerpc: Describe memory-mapped RAM&ROM chips OF bindings

On Tue, 1 Apr 2008, Laurent Pinchart wrote:
> On Monday 31 March 2008 19:06, Sergei Shtylyov wrote:
>>>        p) Freescale Synchronous Serial Interface
>>> -	  q) USB EHCI controllers
>>> +      q) USB EHCI controllers
>>> +      r) Memory-mapped RAM & ROM
>>
>>     Memory-mapped RA/RO Memory again? Should better drop this. :-)
>
> You're quite picky, aren't you ? :-)
>
> I suppose "Memory-mapped RA & RO" won't be accepted, so what about "Auxiliary
> RAM & ROM" ?

Direct-mapped?

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Laurent Pinchart | 1 Apr 2008 14:39

Re: [PATCHv2] powerpc: Describe memory-mapped RAM&ROM chips OF bindings

On Tuesday 01 April 2008 11:18, Trent Piepho wrote:
> On Tue, 1 Apr 2008, Laurent Pinchart wrote:
> > On Monday 31 March 2008 19:06, Sergei Shtylyov wrote:
> >>>        p) Freescale Synchronous Serial Interface
> >>> -	  q) USB EHCI controllers
> >>> +      q) USB EHCI controllers
> >>> +      r) Memory-mapped RAM & ROM
> >>
> >>     Memory-mapped RA/RO Memory again? Should better drop this. :-)
> >
> > You're quite picky, aren't you ? :-)
> >
> > I suppose "Memory-mapped RA & RO" won't be accepted, so what about "Auxiliary
> > RAM & ROM" ?
> 
> Direct-mapped?

Fine with me. Sergei ?

--

-- 
Laurent Pinchart
CSE Semaphore Belgium

Chaussée de Bruxelles, 732A
B-1410 Waterloo
Belgium

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Sergei Shtylyov | 1 Apr 2008 15:04

Re: [PATCHv2] powerpc: Describe memory-mapped RAM&ROM chips OF bindings

Laurent Pinchart wrote:

>>>On Monday 31 March 2008 19:06, Sergei Shtylyov wrote:

>>>>>       p) Freescale Synchronous Serial Interface
>>>>>-	  q) USB EHCI controllers
>>>>>+      q) USB EHCI controllers
>>>>>+      r) Memory-mapped RAM & ROM

>>>>    Memory-mapped RA/RO Memory again? Should better drop this. :-)

>>>You're quite picky, aren't you ? :-)

>>>I suppose "Memory-mapped RA & RO" won't be accepted, so what about "Auxiliary
>>>RAM & ROM" ?

>>Direct-mapped?

> Fine with me. Sergei ?

    I agree. The only thing that somewhat worries me it that it will have no 
"compatible" prop...

WBR, Sergei
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Grant Likely | 1 Apr 2008 15:16
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Re: [PATCHv2] powerpc: Describe memory-mapped RAM&ROM chips OF bindings

On Mon, Mar 31, 2008 at 10:39 AM, Laurent Pinchart
<laurentp <at> cse-semaphore.com> wrote:
>
>  Signed-off-by: Laurent Pinchart <laurentp <at> cse-semaphore.com>
>  ---
>   Documentation/powerpc/booting-without-of.txt |   13 ++++++++++++-
>   1 files changed, 12 insertions(+), 1 deletions(-)
>
>  diff --git a/Documentation/powerpc/booting-without-of.txt b/Documentation/powerpc/booting-without-of.txt
>  index 7b4e8a7..3e1963b 100644
>  --- a/Documentation/powerpc/booting-without-of.txt
>  +++ b/Documentation/powerpc/booting-without-of.txt
>   <at>  <at>  -57,7 +57,8  <at>  <at>  Table of Contents
>        n) 4xx/Axon EMAC ethernet nodes
>        o) Xilinx IP cores
>        p) Freescale Synchronous Serial Interface
>  -         q) USB EHCI controllers
>  +      q) USB EHCI controllers
>  +      r) Memory-mapped RAM & ROM
>
>    VII - Specifying interrupt information for devices
>      1) interrupts property
>   <at>  <at>  -2816,6 +2817,16  <at>  <at>  platforms are moved over to use the flattened-device-tree model.
>                    big-endian;
>            };
>
>  +   r) Memory-mapped RAM & ROM
>  +
>  +    Dedicated RAM and ROM chips are often used as storage for temporary or
>  +    permanent data in embedded devices. Possible usage include non-volatile
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Ram | 1 Apr 2008 18:07
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nand tests causes "uninterruptible sleep"

Hi,
  I am using linux 2.6.22. I am testing my nand driver/nand device.
  I am using a arm based processor.

  To test my nand device, i am using fs-tests package that comes
  with mtd-utils git tree.

  These are standard filesystem regression tests.

  I am running the test to test a particular partition.

  During one of the tests: The test process hangs.
  When i do a ps -eal i get a -D against that process.
  That particular process remains in that state forever.

  I have eliminated all the infinte loops (checks for busy/read pin/nand reset)
  in my nand driver. I have tried to put debug prints to print
failures in my nand
  device. I dont see any failure prints when i run the tests.

  I tried doing "echo t > /proc/sysrq-trigger" i am appending the results.

  Basically, i am trying to isolate the code that is causing the process
  to go into an uniterruptible sleep state.

  It is to be noted that - When the fs-tests process has gone into
"uninterruptible
  sleep state" accessing the partion under test makes that process
  also go into the uninterruptible sleep state"
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Gmane