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+RTEMS PORT OF THE 'pcn' ETHERNET DRIVER
+=======================================
+
+This is a port of the FreeBSD 'pcn' driver as of
+2007/7/17 (checked out from FreeBSD/head on that date).
+
+SUPPORTED BSPs:
+- you need 'libbsdport' which in turn needs 'libbspExt'
+ These work for i386/pc386 and powerpc/new-exception-processing
+ BSPs, i.e., the BSP must implement <rtems/pci.h> and <rtems/irq.h>.
+
+USAGE:
+- to attach this driver:
+ * define a NULL terminated list with all libbsdport supported
+ drivers you want to include with your application:
+
+ extern driver_t libbsdport_pcn_driver;
+
+ driver_t *libbsdport_netdriver_table[] = {
+ &libbsdport_pcn_driver,
+ /* other drivers here or upstream of 'pcn' if they support
+ * the same hardware but are preferred.
+ */
+ 0
+ };
+
+ * specify libbsdport_netdriver_attach for the 'attach' function
+ pointer in struct rtems_bsdnet_ifconfig.
+
+ * use the 'name' field in struct rtems_bsdnet_ifconfig to filter
+ drivers and device instances:
+
+ <driver_name><instance>
+
+ either may be omitted which means that the next available
+ driver/hardware device is to be used. Here are a few examples:
+
+ "" /* use first device found supported by any driver in the
+ * libbsdport_driver_table[].
+ */
+
+ "pcn2" /* use second device supported by the 'pcn' driver */
+
+ Notes: Counting instances begins with 1 (not 0).
+ Consult libbsdport/README for more information.
+
+KNOWN ISSUES:
+- 'ignore_broadcast' and 'mtu' settings from
+ struct rtems_bsdnet_ifconfig are ignored. I haven't seen
+ many drivers that honour 'ignore_broadcast' and 'mtu' can be
+ set using a ioctl(). I'm trying to keep changes to BSD sources
+ minimal...
+- ring sizes are restricted fixed to hardcoded size.
+- Only the internal phy of the 973/975 chips are supported
+ and will allow SIOCGIFMEDIA/SIOCSIFMEDIA to work. I don't know
+ what happens with other chips or external phys.
+ Probably, the factory-default setup should work with autonegotiation
+ but the ioctls wont. YMMV.
+
+OTHER NOTES:
+- you can use the (more generic) 'le' driver for the 79C971
+ and upwards chips, too, but 'pcn' supposedly uses more advanced
+ features of these chips.
+
+TESTED WITH:
+ Technobox 10/100-TX Ethernet PMC (AMD Am79C973 chip)
+
+TESTED ON:
+ rtems-4.7
+ powerpc/beatnik (motorola MVME5500 and MVME6100 VME boards)
+ i386/pc686 (concurrent technologies PP410 compact PCI)
+
+T.S, 200707