The HyperNews Linux KHG Discussion Pages

## NE 2000 card messed up DMA data??

  Forum: Network Buffers And Memory Management
  Date: Tue, 11 Nov 1997 23:39:06 GMT
  From: Jim Cao <jcao@regentec.com>

I am writing a teletext device driver on Linux 2.0.30 (upgraded from RedHat 4.1) which uses IRQ 3 (No option because of the card's jumper), DMA channel 3 and IO port 0x2A0-0x2A3. The driver works perfectly on a standalone system. All of these resources are registered with Linux kernel functions provided. After I added a NE2000 compatible Ethernet card to the system and recompiled the kernel to support TCP/IP and NE 2000, everything was still working fine. NE2000 IO-port is configured to 0x300 and IRQ 10. After checked the system log file and /proc/*, no conflict was found after the system booted up. NOW, comes the problem! As long as I connect the network cable to the ethernet card, the DMA data of my driver is getting lose and totally messed up after a while. Does NE2000 uses some DMA stuff which conflicts with DMA channel 3. I scanned the 8390.c and ne.c in the drivers/net directory but no idea how remote DMA works in the code and it seems no general DMA operation at all. Anyone got the similiar problem before or have some suggestion to get around the problem? Thanks! -Jim Cao