Patch from Eric Norum <eric@cls.usask.ca> based on working with

Bob Wisdon <bobwis@ascweb.co.uk> and Chris Johns <ccj@acm.org>
to resolve a random network lockup problem.

    ckinit.c:
        Occasional network lockups have been noted when the PIT has a higher
        interrupt request level than the CPM.  The SCC1 bit in the CISR is set
        even though the SCC1 interrupt handler is not active.  This blocks
        interrupts from SCC1 (and all other CPM sources) and locks up the
        system.  It has not been determined whether the error is within the
        68360 or in the RTEMS interrupt support assembler code.  The solution,
        for now, is to set both PIT and CPM interrupt request levels to the same
        value (4).

    network.c:
        Set CPM transmitter buffer pointer (_tbptr) to beginning of frame
        before restarting transmitter.  Don't retire transmitter buffer
        descriptors belonging to the restarted frame.

1 files changed, 14 insertions, 0 deletions

diff --git a/c/src/lib/libbsp/m68k/gen68360/README b/c/src/lib/libbsp/m68k/gen68360/README
index 3902ff7d2e..802e518e70 100644
--- a/c/src/lib/libbsp/m68k/gen68360/README
+++ b/c/src/lib/libbsp/m68k/gen68360/README
@@ -299,3 +299,17 @@ The board support package has been tested with:
 		Arnewsh Inc.
 		P.O. Box 270352
 		Fort Collins, CO 80527-0352
+
+Interrupt Notes
+===============
+ckinit.c:
+        Occasional network lockups have been noted when the PIT has a higher
+interrupt request level than the CPM.  The SCC1 bit in the CISR is set
+even though the SCC1 interrupt handler is not active.  This blocks
+interrupts from SCC1 (and all other CPM sources) and locks up the
+system.  It has not been determined whether the error is within the
+68360 or in the RTEMS interrupt support assembler code.  The solution,
+for now, is to set both PIT and CPM interrupt request levels to the same
+value (4).
+
+