Davicom DM data sheet , http: 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. The dc driver programs 82c and 82c PNIC chips to use the store and forward setting for the transmit start threshold by default. Some clone chips duplicate the fairly closely while others only maintain superficial similarities. 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. 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 system configuration variable can be set in the Open Firmware boot monitor using the setenv command or by eeprom 8.
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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 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.
The mediaopt option can also be used to enable full-duplex operation. The dc driver will watch for this condition and requeue the setup frame ax881441 it is transfered successfully.
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TX underrun — using store and forward mode The device continued to 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. The A does qsix exhibit this problem. Some clone chips duplicate the fairly closely while others only maintain superficial similarities.
The dc driver detects this condition and will salvage the frame; however, it incurs a serious performance penalty in the process. This system configuration variable can be set in the Open Firmware boot monitor using the setenv command or by eeprom 8. Some support only MII media attach- ments.
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Davicom DM data sheethttp: All of the clone chips are based on the design with various modifications. The driver tries to detect this condi- tion and bring the adapter back to the D0 full power state, but this may not be enough to aeix the driver to a fully operational condition.
Want to link to this manual page? The dc driver supports the following media types: Others use different receiver filter programming mechanisms. The interface will operate in half duplex mode if this media option is not specified. Not spec- ifying full-duplex implies half-duplex mode.
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The transmitter works but the receiver tends to produce many unexplained errors leading to very poor overall performance. Intel Hardware Reference Manualhttp: 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.
For more information on configuring this device, see ifconfig 8. 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.
Note that the baseTX media type may not be available on certain Intel adapters which support 10Mbps media attachments only. Not specifying full-duplex implies half-duplex mode. The A seems to have a problem with 10Mbps full duplex mode. Some chips especially the PNIC also have peculiar bugs. All other modes on the A seem to work cor- rectly. Note that this condition only occurs when warm booting from another oper- ating system. All of supported chipsets have the same general register layout, DMA descriptor format and method of operation.
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The numbers are a8x8141 in the app notes, but the exact meaning of the bits is not. If you power down your system prior to booting FreeBSD, the card should be configured correctly. 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.
Consequently, autonegoti- ation is not currently supported for this chipset: The dc driver supports the following media options: This workaround has a negligible impact on transmit performance.