Hi, group, another question about XDAIS compilant codecs running on
DM6446 DVSDK.
Is it possible to access the memory taken exclusively by DSP ( i.e.:
not the memory taken by ARM linux kernel, CMEMK module, and DSPLINK
module) from ARM side?
actually, my issue comes from this fact:
(1) the dsp algorithm allocates some buffers to contain some critical
data, e.g.: reconstruced image data;
(2) now, i want to print these data from ARM side. i know theere is DSP
traceutil tool i can use, but I prefer to read these data from arm
client application, so i make use of IVIDENC_OutArgs to get the address
of that buffer, e.g.:
a). at dsp algorithm side, in each IVIDENC_**_process() call, i
set IVIDEnc_OutArgs just like below:
outArgs->reconBufs.numBufs = 1;
outArgs->reconBufs.width = DSP_BUF_STRIDE;
outArgs->reconBufs.bufs[0] = DSP_BUF_ADDR;
outArgs->reconBufs.bufSizes[0] = DSP_BUF_SIZE;
b). at arm client application, after each VIDENC_process() call, i
intend to access the dsp buffer just like below:
status = VIDENC_process(hencode,
&inbuf_desc,
&outbuf_desc,
&encoder_inargs,
&encoder_outargs);
........
bufPhyAddr = encoder_outargs.reconBufs.bufs[0];
bufSize = encoder_outargs.reconBufs.bufSizes[0];
bufLogAddr = Memory_getBufferVirtualAddress(bufPhyAddr,
bufSize);
fwrite(bufLogAddr, bufSize, 1, fp);
......
While, i founded that the "bufPhyAddr" gotten by arm is always equal
to be 0 !!! I feel very confused!
anyway, i also tried to pass the bufPhyAddr via other fileld of
encoder_outargs.reconBufs, except the bufs fields. It seems
sucessfully, but the Memory_getBufferVirtualAddress() call failed!
Is it impossile for arm to access the physical memory taken
exclusively by dsp?
if does, how can i do for this requirement?
ZhouXiao
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