gsm-fw/L1: fix for the DSP patch corruption bug The L1 code we got from the LoCosto fw contains a feature for DSP CPU load measurement. This feature is a LoCosto-ism, i.e., not applicable to earlier DBB chips (Calypso) with their respective earlier DSP ROMs. Most of the code dealing with that feature is conditionalized as #if (DSP >= 38), but one spot was missed, and the MCU code was writing into an API word dealing with this feature. In TCS211 this DSP API word happens to be used by the DSP code patch, hence that write was corrupting the patched DSP code.

--- a/gsm-fw/L1/cfile/l1_drive.c	Mon Oct 19 04:10:34 2015 +0000
+++ b/gsm-fw/L1/cfile/l1_drive.c	Mon Oct 19 17:13:56 2015 +0000
@@ -1115,8 +1115,10 @@
     // Enable frame IT on next TDMA
     l1dmacro_set_frame_it();
 
+    #if (DSP >= 38)
     // DSP CPU load measurement - write logic (provide TDMA frame number to DSP)
     (*((volatile UWORD16 *)(DSP_CPU_LOAD_MCU_W_TDMA_FN))) = (API)l1s.actual_time.fn_mod42432;
+    #endif
 
   #endif // NOT_SIMULATION
 }