On Intel, the memory region cache management is available only if the paging unit is enabled. On Intel target, the chip specific registers can be accessed via 2 methods: Here is a non exhaustive list of adapters which support this driver: Each descriptor can reference one or two memory buffers. This thread is also event driven. This controls how much data the device can absorb under load. In such cases, all the registers which the chip DMAs to have to be swapped and written to, so that when the hardware swaps the accesses, the chip would see them correctly.
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In this chapter will see the initialization phase, how the controller uses the host memory and the 2 threads launched at the initialization time.
Write the Driver Transmit Task 3. To reference these buffers to the DEC chip we use a buffer descriptors ring. Transmission starts when the frame size within the transmit FIFO is larger than the treshold value.
Network Driver Makefile 3. All of the device-specific parameters are passed in the initStr. Learn about the network device 3. It will retrieve the PHY’s address regardless of that, but, since the MII management interface, through which the PHY is configured, is a very slow one, providing an incorrect or invalid address may result in a ddec long boot process.
Including the required managers 4. Document Revision History 7. Check the Intel web site for latest information. This should be selected taking into account the actual operating speed of the PHY.
Here is a non exhaustive list of adapters which support this driver: We choose to use only one buffer of bytes per descriptor. This thread is also event driven. It means that we will have to re-write some mechanisms of this driver. If these flags are not set then the speed is set using the SROM settings.
This chapter describes rapidely the PCI interface of this Ethernet controller. 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.
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.
Early versions used National transcievers, but later versions are depopulated ZX boards.
Understand the network scheduling conventions 3. One buffer has bytes, one descriptor has 16 bytes. To achieve it, we have chosen a Motorola MCP board. We have 7 receive buffers and 1 transmit buffer, and for each, 1 descriptor: We have chosen to implement the PCI address access to obtain compatible source code to the port the driver on a PowerPC target.
This board ddec an Ethernet controller based on a DEC chip. The 2 bytes of data are extracted and processed into a normal pair of bytes. Additional include files 4. The descriptor structure is defined in the Buffer Descriptor Figure.
7. DEC Driver — RTEMS Networking User Manual (master) documentation
Write the Driver Interrupt Handler 3. On Intel, the memory region cache management is available only if the paging unit is enabled. By reading or writing these registers, a driver can obtain information about the type of the board, the interrupt it uses, the mapping of the chip specific registers, ….
Then the driver waits for incoming frame to give to the protocol stack or outcoming frame to send on the physical link. List of Ethernet cards using the DEC chip 8.