Hi Todd and Chris,
Thank for your suggestion. We tried the option 'hole in
the kernel memory space'. But that is not solving our issue.
We tried to reserve memory 30MB at various place in RAM.
But these trials does not help us to solve this issue.
And also we tried to get the memory for this 5MP image
capturing from the CMEM driver. For this we allocated 86MB to CMEM
driver. But the kernel is hanging while loading this CMEM driver.
Is there any limitation in CMEM driver ?
Regards,
Tharmarajan G
On Tue, 2010-07-06 at 09:00 -0600, Todd Fischer wrote:
> Tharmarajan,
>
> I believe you need to rebuild your codec server with a different
> memory map. Another idea is to have a hole in the kernel memory space
> (specify mem= in the kernel command line twice). I am not sure if the
> kernel version you are using for dm355 supports a hole in the kernel
> memory space.
>
> Todd
>
> On Mon, 2010-07-05 at 19:44 +0530, Tharmarajan Ganeshan wrote:
>
> > Hi All,
> > We are working on a DM355 processor based Development
> > board. The Board has 256MB mDDR RAM and 5MP image sensor MT9P031.
> >
> > We are using the kernel version 2.6.10
> >
> > We have modified the driver code for capturing 5MP raw
> > image and converting this 5MP raw into YUV. For this 5MP image
> > capturing , we have reserved 30MB.
> >
> > We have allocated 56MB to the CMEM driver.
> >
> > The reserved memory 30MB and the 56MB memory for CMEM
> > are at top of the RAM.
> >
> > We are passing the remaining memory size to the kernel
> > in bootargs as mem=170M. And we are using the NFS rootfilesystem.
> >
> > But we are getting kernel hanging issues while testing
> > the IPNC_APP applications and 5MP still image capturing. Sometimes
> > the kernel is hanging while booting itself.
> >
> >
> > If we reserve the 30MB from the address region
> > 0x83200000 - 0x84FFFFFF and pass the memory size to kernel in
> > bootargs as mem=50M, then we are NOT having any issues in running
> > the applications. But we want to use the exact remaining memory.
> >
> > And also we are not able to program the NAND flash
> > memory in kernel level if we are not passing the mem=50M in
> > bootargs.
> >
> > What could be the cause for this kernel hanging issue ?
> >
> > Are we missing any configurations while building the
> > kernel image ?
> >
> > Our Bootargs is :
> > mem=50M console=ttyS1,115200n8 root=/dev/nfs rootwait rw
> > ip=192.168.1.90:192.168.1.99:192.168.1.1:255.255.255.0
> > nfsroot=192.168.1.99:/tftpboot/bellatrix_rootfilesystem,nolock
> > eth=00:0C:0C:A0:01:FE v4l2_video_capture=:device=MT9P031
> >
> >
> >
> > Regards,
> > Tharmarajan G
> >
> >
> > _______________________________________________
> > Davinci-linux-open-source mailing list
> > [email protected]
> > http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
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