nanobts: Add support to run nanobts on the 900 band

Change-Id: I13b494630ea835f4bed38ccc77f6a4d5e18326af

example/defaults.conf

@@ -41,7 +41,3 @@ bsc_bts:
     - phys_chan_config: TCH/F
     - phys_chan_config: PDCH
     - phys_chan_config: PDCH
-
-nanobts:
-  trx_list:
-  - arfcn: 531

example/resources.conf.prod

@@ -44,7 +44,7 @@ bts:
   - hw_addr: 00:0c:90:2e:80:1e
     net_device: enp2s0
 
-- label: NanoBTS
+- label: NanoBTS-ONW-1900
   type: nanobts
   ipa_unit_id: 9
   addr: 10.42.42.53
@@ -54,6 +54,16 @@ bts:
     device: '01:01:4d:98:24'
     port: '1'
 
+- label: NanoBTS-ONW-900
+  type: nanobts
+  ipa_unit_id: 10
+  addr: 10.42.42.54
+  band: GSM-900
+  power_supply:
+    type: 'sispm'
+    device: '01:01:4d:98:24'
+    port: '2'
+
 arfcn:
   - arfcn: 512
     band: GSM-1800

example/resources.conf.rnd

@@ -27,7 +27,7 @@ bts:
   launch_trx: true
   ciphers: [a5_0, a5_1]
 
-- label: NanoBTS
+- label: NanoBTS-ONW-1900
   type: nanobts
   ipa_unit_id: 9
   addr: 10.42.42.53

src/osmo_gsm_tester/bts_nanobts.py

@@ -70,6 +70,14 @@ class NanoBts(bts.Bts):
         sgsn_conf = {} if self.sgsn is None else self.sgsn.conf_for_client()
         config.overlay(values, sgsn_conf)
 
+        # Hack until we have proper ARFCN resource allocation support (OS#2230)
+        band = values.get('band')
+        trx_list = values.get('trx_list')
+        if band == 'GSM-1900':
+            config.overlay(trx_list[0], { 'arfcn' : '531' })
+        elif band == 'GSM-900':
+            config.overlay(trx_list[0], { 'arfcn' : '50' })
+
         config.overlay(values, { 'osmobsc_bts_type': 'nanobts' })
 
         self.dbg(conf=values)