--- a/gsm-fw/L1/cfile/Makefile	Sun Aug 17 21:15:32 2014 +0000
+++ b/gsm-fw/L1/cfile/Makefile	Sun Aug 17 21:35:23 2014 +0000
@@ -10,7 +10,7 @@
 IOBJS=	l1_api_hisr.o l1_cmplx_intram.o l1_ctl.o l1_drive.o l1_func.o \
 	l1_mfmgr.o l1_small_asm.o l1_sync_intram.o l1_isr_glue.o
 XOBJS=	l1_afunc.o l1_async.o l1_cmplx.o l1_init.o l1_pwmgr.o l1_small_defs.o \
-	l1_sync.o l1_trace.o
+	l1_sync.o l1_trace.o dummy_tch_data.o
 
 all:	iramcode.o xipcode.o
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gsm-fw/L1/cfile/dummy_tch_data.c	Sun Aug 17 21:35:23 2014 +0000
@@ -0,0 +1,24 @@
+/*
+ * [rt]x_tch_data() calls appear to be some old API for passing CSD payloads
+ * between L1 and the higher layers.  If this API was ever used at all,
+ * it is so old that even the TSM30 code does not use it; the new API that
+ * took its place is dll_data_[du]l().  However, the code in l1_cmplx.c
+ * still calls the old API, thus stub functions are needed.  TSM30 and
+ * Leonardo versions have these stubs in the dl1_com module, but that
+ * module no longer exists in our version - see l1_isr_glue.c for the
+ * explanation.  The LoCosto version has a stub (in sys_dummy.c) only
+ * for tx_tch_data() - the other function gets called only when IDS
+ * is not enabled.
+ *
+ * This module provides the necessary stubs for our version.
+ */
+ 
+void rx_tch_data()
+{
+  return;
+}
+ 
+char *tx_tch_data()
+{
+  return(0);
+}