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Altera_Forum's avatar
Altera_Forum
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16 years ago

TSE transmit and receive buffers

I'm trying to build NIOS II system with Triple Speed Ethernet in SuperLoop mode (DP83848C PHY). I applied the patch to get iniche in SuperLoop mode. Partitialy it works - I can receive packets (A...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

It could be a better idea to only flush the transmit buffer, not all the cache. If the receive buffer is in the cache and a packet is received just before you call alt_dcache_flush_all(), then the new received packet will be overwritten by old data from the cache.

In fact I'm surprised the TSE driver doesn't allocate the 'mbuff' buffers in uncached memory, I thought it did it automatically.