ecos-2.0的开发文档

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								>				>				>Changes to eCos sources				>
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				>Chapter 47. SNMP for 				CLASS="emphasis"
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				>				NAME="NET-SNMP-ECOS-CHANGES">Changes to eCos sources				>				>Small changes have been made in three areas:				>				>				>				TYPE="1"
				>				>				>Various hardware-specific ethernet drivers.				>				>				>				>The generic ethernet device driver.				>				>				>				>The OpenBSD TCP/IP networking package.				>				>				>				>These changes were made in order to export information about the driver and
				the network that the SNMP agent must report.  The changes were trivial in
				the case of the network stack, since it was already SNMP-friendly.  The
				generic ethernet device driver was re-organized to have an extensive header
				file and to add a couple of APIs to extract statistics that the
				hardware-specific device drivers keep within themselves.				>				>There may be a performance hit for recording that data; disabling
				a config option named something like
								CLASS="LITERAL"
				>CYGDBG_DEVS_ETH_xxxx_xxxx_KEEP_STATISTICS				>
				depending on the specific device driver will prevent that.				>				>Not all platform ethernet device drivers export complete SNMP statistical
				information; if the exported information is missing, SNMP will report zero
				values for such data (in the dot3 MIB).				>				>The interface chipset has an ID which is an OID; not all the latest greatest
				devices are listed in the abailable database, so new chipsets may need to
				be added to the client MIB, if not defined in those from UCD.				>				>				CLASS="NAVFOOTER"
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