osmo-bts-trx/scheduler: get rid of _sched_fcch_burst

According to 3GPP 45.002, section 5.2.4, a frequency correction
burst is basically a sequence of zeros.  Since br->burst is already
zero-initialized, there is no need to maintain and memcpy() another
sequence of zeros into it. Just set the length.

Change-Id: Ic4f6d550010da5caf4bc471ff1e184c9fab30c6d

3 files changed, 2 insertions, 11 deletions

diff --git a/include/osmo-bts/scheduler_backend.h b/include/osmo-bts/scheduler_backend.h
index be23c474..eb8039f3 100644
--- a/include/osmo-bts/scheduler_backend.h
+++ b/include/osmo-bts/scheduler_backend.h
@@ -37,7 +37,6 @@ extern const struct trx_chan_desc trx_chan_desc[_TRX_CHAN_MAX];
 
 extern const ubit_t _sched_tsc[8][26];
 extern const ubit_t _sched_egprs_tsc[8][78];
-extern const ubit_t _sched_fcch_burst[148];
 extern const ubit_t _sched_sch_train[64];
 
 struct msgb *_sched_dequeue_prim(struct l1sched_trx *l1t, int8_t tn, uint32_t fn,
diff --git a/src/common/scheduler.c b/src/common/scheduler.c
index 62efed41..30689186 100644
--- a/src/common/scheduler.c
+++ b/src/common/scheduler.c
@@ -62,15 +62,6 @@ static const ubit_t dummy_burst[GSM_BURST_LEN] = {
 	0,0,0,
 };
 
-/*! \brief FCCH Burst (TS 05.02 Chapter 5.2.4) */
-const ubit_t _sched_fcch_burst[GSM_BURST_LEN] = {
-	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
-};
-
 /*! \brief Training Sequences (TS 05.02 Chapter 5.2.3) */
 const ubit_t _sched_tsc[8][26] = {
 	{ 0,0,1,0,0,1,0,1,1,1,0,0,0,0,1,0,0,0,1,0,0,1,0,1,1,1, },
diff --git a/src/osmo-bts-trx/sched_lchan_fcch_sch.c b/src/osmo-bts-trx/sched_lchan_fcch_sch.c
index bc03f816..2a5e482b 100644
--- a/src/osmo-bts-trx/sched_lchan_fcch_sch.c
+++ b/src/osmo-bts-trx/sched_lchan_fcch_sch.c
@@ -40,7 +40,8 @@ int tx_fcch_fn(struct l1sched_trx *l1t, enum trx_chan_type chan,
 {
 	LOGL1S(DL1P, LOGL_DEBUG, l1t, br->tn, chan, br->fn, "Transmitting FCCH\n");
 
-	memcpy(br->burst, _sched_fcch_burst, GSM_BURST_LEN);
+	/* A frequency correction burst is basically a sequence of zeros.
+	 * Since br->burst is already zero-initialized, just set the length. */
 	br->burst_len = GSM_BURST_LEN;
 
 	return 0;