Murali Karicheri
Software Design Engineer
Texas Instruments Inc.
Germantown, MD 20874
Phone : 301-515-3736
email: [EMAIL PROTECTED]
________________________________
From: Stephen Berry [mailto:[EMAIL PROTECTED]
Sent: Tuesday, September 02, 2008 10:37 AM
To: Karicheri, Muralidharan
Cc: pavelhan; davinci-linux-open-source
Subject: Re: Ipipe req_bufs failed
There are a bunch of issues using kernel memory space. Even when you do have
enough to use for a large 5Mpix buffer (which is 10MB) it seems to get
fragmented over time. So while you might be able to allocate it once, once it
gets freed all bets are off the next time you want to use it.
In addition there is a problem with buffers that large to begin with. There is
a #define in the kernel, the name of which escapes me at the moment, which
defines the largest page size you can allocate, and it's too small. Changing it
recompiles everything in the kenel, and was just a little scary...
Also, I remember that I've had issues with CMEM and V4l2. Last time I tried to
pass in a USERPTR to the V4L2 (and vpfe) all of my DQBUF calls failed.
[MK] Have you tried increasing the size of kernel buffers allocated by V4L2
capture? This will allocate at init time and reserve the pages. You could then
use the ptr from DQBUF to pass to ipipe driver. V4L2 capture currently support
only mmaped IO.
Are there any examples on how to use CMEM with V4l2?
Steve
Karicheri, Muralidharan wrote:
Hello,
You are actually reducing the memory available to kernel by setting mem=80M.
What you might want to do is to allocate memory using CMEM and use it instead
of req_buf. Request buffer allocates memory from kernel memory space.
Otherwise, use bigger kernel memory instead of reducing it.
From: [EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]> [mailto:[EMAIL PROTECTED] On
Behalf Of pavelhan
Sent: Tuesday, September 02, 2008 5:52 AM
To: davinci-linux-open-source
Subject: Ipipe req_bufs failed
Hi everyone!
I want to get a full resolution 5MP(2592x1944) picture from my MT9p031 sensor.
but I failed when I req_buffers in the ipipe initialization procedure.
I allocate a 80M memory to my linux in the bootargs(mem=80M),so I think there is
a enough space for I allocate 1 5MP ipipe buffer from linux(which will require
about
10M bytes),but when I execute the program, I only get the following errors:
starting mt9p001_ipipe_init
IPIPE idm355_ipipe dm355_ipipe.2: 4.request_buffer:not
enough memory
nit
IPIPE_REQBUF fail
IPIPE init fail
what should I do to get the problem solved?
any help will be appreciated!
Thank you!
2008-09-02
________________________________
Pavel Han
Oplinx Co.,Ltd
Address:Hanggang Fuchun Business Mansion 2116# Futian, Shenzhen 518041,PRC
Tel: (086)0755-88359865
Website:www.oplinx.com.cn
E-mail: [EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>
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