SIM speed enhancement re-enabled and made configurable TI's original code supported SIM speed enhancement, but Openmoko had it disabled, and OM's disabling of speed enhancement somehow caused certain SIM cards to start working which didn't work before (OM's bug #666). Because our FC community is much smaller in year 2020 than OM's community was in their day, we are not able to find one of those #666-affected SIMs, thus the real issue they had encountered remains elusive. Thus our solution is to re-enable SIM speed enhancement and simply wait for if and when someone runs into a #666-affected SIM once again. We provide a SIM_allow_speed_enhancement global variable that allows SIM speed enhancement to be enabled or disabled per session, and an /etc/SIM_spenh file in FFS that allows it to enabled or disabled on a non-volatile basis. SIM speed enhancement is now enabled by default.

/*
 * BUZZER.H
 *
 * Buzzer and light control
 *
 * Target : ARM 
 *
 * Copyright (c) Texas Instruments 1996
 *
 */

#define BZ_LEVEL       ARMIO_BUZZER
#define LT_LEVEL       ARMIO_LIGHT

// Bit definitions in CNTL
#define BZ_ON			0x01	// start buzzer
#define LT_ON			0x02	// start light

// Buzzer control
void BZ_Init(void);
void BZ_Enable(void);
void BZ_Disable(void);
void BZ_Tone(int f);
void BZ_Volume(int v);
void BZ_IntHandler(void);
void BZ_KeyBeep_ON(void);
void BZ_KeyBeep_OFF(void);

// LCD and keypad Light control
void LT_Enable(void);
void LT_Disable(void);
void LT_Level(SYS_WORD8 level);
SYS_BOOL LT_Status(void);