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CT60 and related things BBS
| Ethernet CTPCI freeze workaround |
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Posted by: Didier Méquignon
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May,01.2012-09:30
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Some news...
I created 3 GPL ethernet drivers for the RTL8139:
1st internal for LWIP and TOS.
2nd external for STING for TOS/MagiC.
3rd external for replace the ethernet MiNT driver.
The fastest ethernet stack for create freezes is MiNT.
I tried to reduce the DMA windows to 512KB without changes and finally found that the freeze ethernet problem is the same that USB. An acces to MMIO RT8139 register during a DMA transfer can freeze the system on CT60/CTPCI. I have no information about DMA transfer status (running or not), but I have found a workaround:
Inside the interrupt routine I added a 100uS delay before read the RTL8139 status register. The maximum time for this interrupt now is 1mS.
I removed the DMA interrupt task (1st workaround without rewrite the driver).
Didier
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