This value can be used to determine the distance from the Ethernet tap to the point on the Ethernet cable that is shorted or open unterminated. The first part is the PCI configuration registers and their set up. This is potentially a hardware failure. The size requested is 80, bytes. The le driver also supports the following Sun SBus Ethernet add-on adapters: The constant NONE can be used to indicate no specific size limitation.
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This value can be used to determine the distance from the Ethernet tap to the point on the Ethernet cable that is shorted or open unterminated.
Big endian processors can be connected to the PCI bus through some controllers which take care of hardware byte swapping.
This array is typically created and stuffed by the BSP code. This parameter can be used to explicitly limit the amount of shared memory bytes this driver will use. The software interface to the driver is divided into three parts. The le driver allows the selection of the following media types via ifconfig 8 with these on-board interfaces: Network performance will be affected, since the target will no longer be able to receive all valid packet sizes.
It assumes that this shared memory is directly available to it without any arbitration or timing concerns.
FreeBSD Manual Pages
Typically, this involves programming an interrupt aamd hardware, either internal or external to the CPU. Some targets use additional interrupt zm79c970 devices to help organize and service the various interrupt sources.
All initialization is performed within the attach routine; there is no separate initialization routine. These parameters, and the mechanisms used to communicate them to the driver, are detailed below. Since the le driver allocates buffers large enough to receive maximum sized Ethernet packets, this means some other station on the LAN transmitted a packet larger than allowed by the Ether- net standard.
The chip still has to be programmed to operated in little endian mode as it is on the PCI bus. Use of this parameter should be rare.
If the cpu board hardware automatically swaps all the accesses to and from the PCI bus, then input and output byte stream need not be swapped. This driver is designed to be moderately generic, operating unmodified across the range of architectures am79c790 targets supported by VxWorks.
The driver can be configured to support big-endian or little-endian architectures. Therefore, in the global interface structure, the function pointer to the initialization routine is NULL. Wm79c970 second and third part are dealt in the driver.
This includes a superset of the PCI bus Ethernet chips supported by the pcn 4 driver. The size requested is 80, bytes.
AM79C Datasheet(PDF) – Advanced Micro Devices
Some target hardware that restricts the shared memory region to a specific location also restricts the access width to this region by the CPU. It indicates to the driver where to find the RDP register. The LANCE will finish transmitting the current packet, but will not automatically retry transmission if there is a collision. Current internal support for this mechanism is not robust; implementation may not work on all targets requiring these restrictions. This is potentially a hardware fail- ure.
The first part is the PCI configuration registers and their set up. Skip site navigation 1 Skip section navigation 2 Header And Logo. The default value supports Motorola-type buses. This parameter is used only if a specific memory region is am79cc970 to the driver.
The constant NONE can be used to indicate that there are no memory limitations, in which case, the driver attempts to allocate the shared memory from the system space. This is potentially a hardware failure. Want to link to this manual page? The default buffer size is large enough to hold a maximum-size Ethernet packet. In such cases all the registers which the chip DMA s to have to be swapped and written to, so that when the hardware swaps the accesses, the chip would see them correctly.
To achieve this, the driver must be given several target-specific parameters, and some external support routines must be provided.