C5471 ethernet debug

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@431 42af7a65-404d-4744-a932-0658087f49c3

TODO

@@ -43,6 +43,8 @@ o Network
   used concurrently by two threads.  Minimal fix:  Add mutex to support exclusion.
 - IPv6 support is incomplete
 - Incoming UDP broadcast should only be accepted if listening on INADDR_ANY(?)
+- Should add some driver call to support throttling... when there is no listener
+  for new data, the driver should be throttled.
 
 o USB
 - Implement USB device support
@@ -76,7 +78,10 @@ o ARM
   user stack allocation larger than needed.
 
 o ARM/C5471
-- Needs an Ethernet driver
+- Ethernet driver has problems on receive side.  The cause of the problem seems
+  to be that the hardware waits for about 3 seconds before interrupting the driver.
+  By then, the sender has already retransmitted and things are out of sync.
+  Probable cause:  TX configuration problem. 
 
 o ARM/DM320
 - It seems that when a lot of debug statements are added, the system no

arch/arm/src/c5471/c5471_ethernet.c

@@ -1486,7 +1486,7 @@ static int c5471_interrupt(int irq, FAR void *context)
   /* Handle interrupts according to status bit settings */
   /* Check if we received an incoming packet, if so, call c5471_receive() */
 
-  if (EIM_STATUS_CPU_TX & c5471->c_eimstatus)
+  if ((EIM_STATUS_CPU_TX & c5471->c_eimstatus) != 0)
     {
       /* An incoming packet has been received by the EIM from the network and
        * the interrupt associated with EIM's CPU TX queue has been asserted. It
@@ -1508,7 +1508,7 @@ static int c5471_interrupt(int irq, FAR void *context)
 
   /* Check is a packet transmission just completed.  If so, call c5471_txdone */
 
-  if (EIM_STATUS_CPU_RX & c5471->c_eimstatus)
+  if ((EIM_STATUS_CPU_RX & c5471->c_eimstatus) != 0)
     {
       /* An outgoing packet has been processed by the EIM and the interrupt
        * associated with EIM's CPU RX que has been asserted. It is the EIM's

configs/c5471evm/defconfig

@@ -279,6 +279,7 @@ CONFIG_NET_SOCKOPTS=y
 CONFIG_NET_BUFSIZE=420
 CONFIG_NET_TCP=n
 CONFIG_NET_TCP_CONNS=40
+CONFIG_NET_NTCP_READAHEAD_BUFFERS=8
 CONFIG_NET_MAX_LISTENPORTS=40
 CONFIG_NET_UDP=n
 CONFIG_NET_UDP_CHECKSUMS=y

configs/c5471evm/netconfig

@@ -279,6 +279,7 @@ CONFIG_NET_SOCKOPTS=y
 CONFIG_NET_BUFSIZE=420
 CONFIG_NET_TCP=y
 CONFIG_NET_TCP_CONNS=8
+CONFIG_NET_NTCP_READAHEAD_BUFFERS=32
 CONFIG_NET_MAX_LISTENPORTS=8
 CONFIG_NET_UDP=n
 CONFIG_NET_UDP_CHECKSUMS=y