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Altera_Forum's avatar
Altera_Forum
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15 years ago

Ethernet problem turned out to be a memory / DMA problem

So I have spent a couple weeks trying to troubleshoot Ethernet functionality on my custom board. I finally isolated the problem last night. Ethernet data is getting into the FPGA just fine. I can ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

I'm pretty new at this stuff so I welcome any obvious hints... When I look at my memory map the TLB addresses are at a different address than the DMA stuff.

Where should I be comparing buffer addresses to? I noticed what appeared to be a bug to me in the Linux SGDMA drivers that they appear to grab a 0x400 wide memory range even though their actual control reigster address is much narrower. Hardcoding address offsets between the DMA's seemed to at least let me send data.

David