Paul Regnier wrote: > Hi, > > I'am a master student of the Federal University of Bahia, > working with Markos Fernandez on a real-time protocol > to be implemented on shared-ethernet. > > I'd like to know if some Ethernet NICs allows to access the > carrier-sense state of the bus, exporting it to the kernel > through some device register?
The ethtool interface is generally used for any low-level (but generic) NIC information and configuration under Linux. RTnet supports ETHTOOL_GLINK with one NIC so far (rt_8139too) to meet a special user scenario. > > It seems that some NICs of 3COM (3C90x and 3C90xB) > has a "carrierSense" read-only register which can be accessed to > get this information. Also, is there any RT-net driver for this NICs ? There is the rt_3c59x.c, not sure if it serves your hardware as well. Moreover, it is kind of permanently experimental due to unsolved (unsolvable?) indeterminism in its hardware access. Jan
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