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.

/*
 *        Filename l1audio_abb.h
 *  Copyright 2003 (C) Texas Instruments  
 *
 *
 */

#define ABB_L1_WRITE(addr,data) (((data) << 6) | (addr) | 0x01)

void ABB_CAL_UlVolume     (UWORD8 pga_index);
void ABB_CAL_DlVolume     (UWORD8 volume_index, UWORD8 pga_index);
void ABB_UlVolume         (UWORD8 volume_index);
void ABB_DlVolume         (UWORD8 volume_index);
void ABB_DlMute           (BOOL mute);
void ABB_SideTone         (UWORD8 volume_index);
void ABB_Audio_Config     (UWORD16 data);
void ABB_Audio_Config_2   (UWORD16 data); 
void ABB_UlMute           (BOOL mute);
void ABB_Audio_Control    (UWORD16 data);
void ABB_Audio_On_Off     (UWORD16 data);
void ABB_Audio_Volume     (UWORD16 data);
void ABB_Audio_PLL        (UWORD16 data);
void ABB_Audio_VBPop      (UWORD16 data);
void ABB_Audio_Delay_Init (UWORD8 delay);