All of the clone chips are based on the design with various modifications. 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. 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 a second warm boot to have the device properly configured. All other modes on the A seem to work cor- rectly. Note that the baseTX media type may not be available on certain Intel adapters which support 10Mbps media attachments only.
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At least one supports only chained DMA descriptors most support both chained descriptors and contiguously allocated fixed size rings.
Some support only MII media attach- ments. 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.
Not specifying full-duplex implies half-duplex mode. Skip site navigation 1 Skip section navigation 2 Header And Logo. Want to link to this manual page?
The dc driver programs 82c and 82c PNIC chips to use the store and forward setting for the transmit start threshold by default. All of the clone chips are based on the design with various modifications. 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.
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The controller loses all of its PCI configuration in the D3 state, so if the BIOS does not ax881141 it back to full power mode in time, it will not be able to configure it correctly. The interface will operate in half duplex mode if this media option is not specified.
If you power down your system prior to booting FreeBSD, the card should be configured correctly. 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 a second warm boot to have the device properly configured. The dc driver detects this condition and as88141 salvage the frame; however, it incurs a serious performance penalty aslx the process. Some chips especially the PNIC also have peculiar bugs.
The mediaopt option can also be used to enable full-duplex operation.
Consequently, autonegoti- ation is not currently supported for this chipset: All of supported chipsets have the same general register layout, DMA descriptor format and method of operation. The dc driver will watch for this condition and requeue the setup frame until it is transfered successfully.
The transmitter works but the receiver tends to produce many unexplained errors leading to very poor overall performance. These chips are used by many vendors which makes it difficult to provide a complete list of all supported cards. This system configuration variable can be set in the Open Firmware boot monitor using the setenv command or by eeprom 8.
Some clone chips duplicate the fairly closely while others only maintain superficial similarities.
The dc driver supports the following media types: 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. Davicom Pp data sheethttp: Others use different receiver filter programming mechanisms. The also offers several receive filter program- ming options including perfect filtering, inverse perfect filtering and hash table filtering. The numbers are documented in the app notes, but the exact meaning of the bits is not.
The A does not exhibit this problem.
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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. For more information on configuring this device, see ifconfig 8. Not spec- ifying full-duplex implies half-duplex mode. 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.
Note that the baseTX media type may not be available on certain Intel adapters which support 10Mbps media attachments only.