Any one who has any experience when using IDMA on mpc82xx?
Currently, the status what I have got is, memory-to-memory mode, both Data bus
had been set to 60x-bus, which means DDTB and SDTB are working on 60x-bus. if set DMA_WRAP in DCM as 64-byte, SS_MAX,STS and DTS in
(IDMA Parameter RAM) all to 32 Bytes, there working good!
But if set DMA_WRAP more than 64-byte(i.e 256-bytes) ,SS_MAX,STS and DTS in (IDMA Parameter RAM)
all to 7*32 Bytes when WRAP = 256 . then got some
issues:
1. some bytes in a packet had been changed oddly. for example if some bytes in the packet is "20 0f
17 2c...." after
IDMA transmission , the bytes will be changed as "20 1d 17 2c", there
is a slightly different with "17" and "1d".
2. some bytes had been swapped , for example "20
0f 17 2c" , after transmission , the bytes in packet was "2c 17 0f
20".
Any ideas?
Is this the cache issue? I had enabled the snooping
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