Command and Variable Index Index. We plan to port the DEC driver for the Netboot tool. Network device configuration 4. 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. We have chosen to implement the PCI address access to obtain compatible source code to the port the driver on a PowerPC target.

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Each descriptor can reference one or two memory buffers.

Software and Drivers for the Intel® PRO/100 Adapter

This chapter describes rapidely the PCI interface of this Ethernet controller. To achieve it, we have chosen a Motorola MCP board. Increasing the size of the heap 4. DEC Driver 2140 7. We have chosen to use 7 receive buffers and 1 transmit buffer to optimize memory allocation due to cache and paging problem that will be explained in the section Encountered Problems.

Write the Driver Receive Task 3. Write the Driver Attach Function 3. Because we use only one transmit buffer, we are sure that the frame is well-sent before sending the next. Therefore, we had to provide a way to manage the cache. Driver basic operation 5.


We have chosen to implement the PCI address access to obtain compatible deec code to the port the driver on a PowerPC target. We have 7 receive buffers and 1 transmit buffer, and for each, 1 descriptor: The descriptor structure is defined in the Buffer Descriptor Figure.

Early versions used National transcievers, but later versions are depopulated ZX boards.

First draft of this document Planned releases: Write the Driver Initialization Function. 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.

Adding a Default Route 4.

Finally, we will see what will be done for ChorusOs and Netboot environment. Tapping Into an Interface 4.

Then the driver waits for incoming frame to give to the protocol stack 221140 outcoming frame to send on the physical link. We choose to use only one buffer of bytes per descriptor.

Download Intel Based PCI Fast Ethernet Adapter (Generic)

Additional include files 4. Concerning the buffers and their descriptors, we have tried to optimize the memory space in term of allocated page. This allows not to lose too much memory or not to disable cache memory for a page which contains other data than buffer, which could decrease performance.


Learn about the network device 3. Once this operation performed, the driver is able to extract the information it needs to configure the board internal registers, like the interrupt line, the base address,… The board internal registers will not be detailled here. The difference between a receive and a transmit buffer descriptor is located in the status and control bits fields.

Command and Variable Index Index.

Many Ethernet adapter cards use the Tulip chip. Accton EN All three media types supported. This thread is also event driven. But concerning the port of the DEC driver into Netboot, we are faced with a problem: This board includes an Ethernet controller based on a DEC chip.

On Intel, the memory region cache management is available only if the paging unit def enabled.