From: john ke <vcppjava@yahoo.com>
To: linuxppc-embedded@ozlabs.org
Subject: IDMA on MPC82xx
Date: Tue, 7 Nov 2006 16:53:40 -0800 (PST) [thread overview]
Message-ID: <20061108005340.16693.qmail@web33205.mail.mud.yahoo.com> (raw)
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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 woking 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?
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