DEC 21140 A DRIVER DOWNLOAD

First version of this document. Write the Driver Transmit Task 3. This should be selected taking into account the actual operating speed of the PHY. The difference between a receive and a transmit buffer descriptor is located in the status and control bits fields. This routine can use these fields in any manner. This routine should reset, initialize, and select an appropriate media.

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RTEMS 4.6.6 On-Line Library

Understand the network scheduling conventions 3. No jumpering diagram is necessary. On Intel target, the chip specific registers can be accessed via 2 methods: All the buffers allocated to store the incoming or outcoming frames, buffer descriptor and also the PCI address space of the DEC board are located in a memory space with cache disable.

The driver also and contains error recovery code that handles known device errata related to DMA activity. Write the Driver Transmit Task 3.

This thread is event driven. Write the Driver Receive Task 3. The driver supports big-endian or little-endian architectures as a configurable option.

This controls how much data the device can absorb under load. This thread is also event driven. Driver basic operation 5. Command and Variable Index Index.

This chapter describes rapidely the PCI interface of this Ethernet controller. This DEC chip uses the host memory to store the incoming Ethernet frames and the descriptor of these frames. A media select routine is typically defined as: The module that is responsible for optimally configuring the media layer will start scanning the MII bus from the address in phyAddr. It is used to translate a physical memory 211440 into a PCI-accessible address.

Adding an IP Alias 4. This driver is designed to be moderately generic. We have 7 receive buffers and 1 transmit buffer, and for each, 1 descriptor: The difference between a receive and a transmit buffer descriptor is located in the status and control bits fields.

Each time an Ethernet frame is put in the transmit queue, an event is sent to the transmit thread, which empty the queue by sending each outcoming frame. Write the Driver Start Function. We use Netboot tool to load our development from a server to the target via an ethernet network. Write the Driver Statistic-Printing Function 4. If these flags are not set then the speed is set using the SROM settings. Transmission starts when the frame size within the transmit FIFO is ddc than the treshold value.

All of the device-specific parameters are passed in the initStr.

To achieve this, the driver requires a few external support routines as well as several target-specific parameters. Many Ethernet adapter cards use the Tulip chip.

Error When Using DEC Based PCI Ethernet

Although PCI configuration for a device is handled in the BSP, all other device programming and initialization needs are handled in this module. This routine can use these fields in any manner. The format of the parameter string is: The driver control structure member mediaCountis initialized to 0xff at startup, while the other media control members mediaDefaultmediaCurrentand gprModeVal are initialized to zero.