The chips appear to upload several kilobytes of garbage data along with the received frame data, dirtying several RX buffers instead of just the expected one. This can happen if the device is unable to deliver interrupts for some reason, of if there is a problem with the network connection cable or network equipment that results in a loss of link. Intel Hardware Reference Manual , http: The dc driver supports the following media options: Others use different receiver filter programming mechanisms.
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All other modes on the A seem to work cor- rectly. Some clone chips duplicate the fairly closely while others only maintain superficial similarities. Some operating systems place the controller in low power mode when shutting down, and some PCI BIOSes fail to bring the chip out of this state before configuring it. TX underrun — using store and forward mode The device continued asixx generate transmit underruns even after all possible transmit start threshold settings had been tried, so the driver programmed the chip for store and forward mode.
If you power down your system prior to booting FreeBSD, the card should be configured correctly. The numbers are documented in the app notes, but the exact meaning of the bits is not.
For more information on configuring this device, see ifconfig 8. The dc driver does its best to provide generalized support for all of these chipsets in order to keep special case code to a minimum. Intel Hardware Reference Manualhttp: The 82c and 82c PNIC chips also have a receiver bug that sometimes manifests during periods of heavy receive and transmit activity, where the chip will improperly DMA received frames to the host.
At least one supports only chained DMA descriptors most support both chained descriptors and contiguously allocated fixed size rings. Others use different receiver filter programming mechanisms. Consequently, autonegoti- ation is not currently supported for this chipset: The A seems to have a problem with 10Mbps full duplex mode.
Xerox Phaser 3400 Internal NIC 10/100 Base T Network Interface Card 097S02722
The driver tries to ax8841 this condi- tion and bring the adapter back to the D0 full power state, but this may not be enough to return the driver to a fully operational condition. The A does not exhibit this problem.
Note that this condition only occurs when warm booting from another oper- ating system. Aeix dc driver supports the following media types: The PNIC chips also sometimes generate a transmit underrun error when the driver attempts to download the receiver filter setup frame, which can result in the receive filter being incorrectly programmed.
Davicom DM data sheethttp: Not spec- ifying full-duplex implies half-duplex mode. This system configuration variable can be set in the Open Firmware boot monitor using the setenv command or by eeprom 8. The controller loses all of its PCI configuration in the D3 state, so if the BIOS does not set it back to full power mode in time, it will not be able to configure it correctly.
The dc driver detects this condition and will salvage the frame; however, it incurs a serious performance penalty in the process. Want to link to this manual page? Some support only MII media attach- ments.
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The dc asic programs 82c and 82c PNIC chips to use the store and forward setting for the transmit asox threshold by default. The transmitter works but the receiver tends to produce many unexplained errors leading to very poor overall performance.
The interface will operate in half duplex mode if this media option is not specified. These chips are used by many vendors which makes it difficult to provide a complete list of all supported cards.
ASIX Network Drivers Download
The dc driver supports the following media options: Note that the baseTX media type may not be available on certain Intel adapters which support 10Mbps media attachments only. Some chips especially the PNIC also have peculiar bugs. BUGS The Macronix application notes claim that in order to put the chips in normal operation, the driver must write a certain magic number into the CSR16 register.
This can happen if the device is unable to deliver interrupts for some reason, of if there is a problem with the network connection cable or network equipment that results in a loss xa88141 link.
If you see this message at boot time and the driver fails to attach the device as a network interface, you will have to perform qx88141 second warm boot to have the device properly configured. The mediaopt option can also be used to enable full-duplex operation.