SAMV7 EMAC: Fix alignment issue: RX buffers need to be invalidated. This means the alignment of buffers must be at least to the data cache line size at both ends of the buffer

configs/samv71-xult/README.txt

@@ -88,14 +88,8 @@ The BASIC nsh configuration is fully function (as desribed below under
      So there is still plenty to be done.
 
   6. There is a port of the SAMA5D4-EK Ethernet driver to the SAMV71-XULT.
-     Some basic functionality is present, but there are issues:
+     Some basic functionality is present, but there is at least one issue:
-
+     The driver does not yet work I- and D-Caches enabled.
-     - There is a compiler optimization problem.  At -O2, there is odd
-       behavior on pings and ARP messages.  But the behavior is OK with
-       optimization disabled.  This is clearly a compiler issue, but I
-       will need eventually to find something better than -O0.
-     - The driver has not been tested with I- and D-Caches enabled.  There
-       are likely issues in that configuration.
 
   7. The USBHS device controller driver (DCD) is complete but non-functional.
      At this point, work has stopped because I am stuck.  The problem is that
@@ -802,8 +796,7 @@ Configuration sub-directories
        long, perhaps minutes, if the network cable is not connected!
 
        If fast boot times are required, you need to perform asynchronous
-       network initialization as described about under "Network Initialization
+       network initialization as described under "Network Initialization Thread"
-       Thread"
 
     5. SDRAM is NOT enabled in this configuration.
 

configs/samv71-xult/netnsh/defconfig

@@ -751,7 +751,7 @@ CONFIG_IOB_NCHAINS=8
 CONFIG_IOB_THROTTLE=8
 # CONFIG_NET_ARCH_INCR32 is not set
 # CONFIG_NET_ARCH_CHKSUM is not set
-# CONFIG_NET_STATISTICS is not set
+CONFIG_NET_STATISTICS=y
 
 #
 # Routing Table Configuration