RetailOS Options

retailOS has some 'secret' options that you can enable by placing files into iPod_Control/Device.

The following table shows all known options, with information on what device are they supported. Some of these appear to have no cross-references in q3k's decompilation, but that might be a tooling issue. Ideally, we should test every single one of these :).

Name	iPod nano (5th generation)	iPod nano (6th generation)			Notes
	1.0.2	1.0	1.1	1.2
_enable_options	Yes	Yes	Yes	Yes	Required for any other option to work.
_6bits_accel	Yes	No	No	No
_EQBiasScale	Yes	No	No	No	Contents read.
_RecorderGainDB	Yes	No	No	No	Contents read.
_RecorderGainLimit	Yes	No	No	No	Contents read.
_SpeakerEQPreset	Yes	No	No	No	Contents read.
_SpeakerEQ_HPF_Fc	Yes	No	No	No	Contents read.
_accel_data	Yes	No	No	No
_accel_state_logging	No	No	No	Yes
_amc_pde	No	Yes	Yes	Yes
_amc_r2d	Yes	No	No	No
_amc_sfd	No	Yes	Yes	Yes
_autopow_overlay	Yes	No	No	No
_battery_always_low	Yes	No	No	No
_bvtpowertest	Yes	Yes	Yes	Yes
_camera_one_to_one	No	Yes	Yes	Yes
_camera_tvout	No	Yes	Yes	Yes
_car_adapter	Yes	No	No	No
_clock_second_tick_type	No	Yes	Yes	Yes
_compare_gk2d_tdraw_perf	No	Yes	Yes	Yes
_compositor_benchmark	No	Yes	Yes	Yes
_compositor_fps	No	Yes	Yes	Yes
_compositor_show_overdraw	No	Yes	Yes	Yes
_continuous_display_update	No	Yes	Yes	Yes
_crossfade_nextprev_disable	No	Yes	Yes	Yes
_crossfade_nextprev_long	No	Yes	Yes	Yes
_crossfade_nextprev_med	No	Yes	Yes	Yes
_crossfade_on	Yes	No	No	No
_dartboard	Yes	No	No	No	Weird mode in which menu/play are swapped and iTunes database seems to be ignored.
_deblocking_off	Yes	No	No	No
_debug_db	Yes	No	No	No
_demo_freeze_time	No	Yes	Yes	Yes
_demo_layout_toggle	No	Yes	Yes	Yes
_disable_bpfix	Yes	Yes	Yes	Yes
_disable_cache	Yes	No	No	No
_disable_clock_gating	Yes	Yes	Yes	Yes
_disable_hibe	Yes	No	No	No
_disable_jpeg_decoder	Yes	No	No	No
_disable_mbx_timeout	Yes	No	No	No	Mailbox timeouts? PowerVR MBX timeouts? Untested.
_disable_overlay_limit	Yes	No	No	No	_enable_options not required.
_disable_sleep	Yes	No	No	No
_disable_unsplit_decoders	Yes	No	No	No
_dont_reject_vid	Yes	No	No	No
_drag_back_perf	No	Yes	Yes	Yes
_dragster_on	Yes	No	No	No
_enable_amc_logfile	No	Yes	Yes	Yes
_enable_crash_logging	Yes	No	No	No
_enable_logging	Yes	No	No	No	Writes high-level logs into iPod_Control/Logs.
_enable_memory_logging	Yes	No	No	No
_enable_pcm_write2file	No	Yes	Yes	Yes
_enable_screenshots	No	Yes	Yes	Yes
_enable_tpodlog	No	Yes	Yes	Yes
_fast_debug	No	Yes	Yes	Yes
_faster_baud_debug	No	Yes	Yes	Yes
_firewire_supported	Yes	No	No	No
_fixed_brightness	No	Yes	Yes	Yes
_fm_fieldtesting	Yes	No	No	No
_force_AACHE	Yes	No	No	No
_force_AACLC	Yes	No	No	No
_force_volume_level	No	Yes	Yes	Yes
_go_fast	Yes	Yes	Yes	Yes
_hang_frame_drop	Yes	No	No	No
_heap_beep	Yes	No	No	No
_hibe_beep	Yes	Yes	Yes	Yes
_hibe_sleep	Yes	No	No	No
_hibernation_ignores_accessories	No	Yes	Yes	Yes
_hifi_video_encoding	Yes	No	No	No
_hold3beep	Yes	No	No	No	Halt and wait for JTAG in C_exception_handler. Probably.
_honor_repeat	Yes	No	No	No
_ignore_volume_pref	Yes	No	No	No
_isp_manual	No	Yes	Yes	Yes
_isp_settings_file	No	Yes	Yes	Yes
_krypton_firmware	No	Yes	Yes	Yes
_krypton_no_autoupdate	No	Yes	Yes	Yes
_log_memory_on_vol_keys	No	Yes	Yes	Yes
_log_sys_model	Yes	Yes	Yes	Yes
_look_ahead_video_encoding	Yes	No	No	No
_mecca_trace_debug	Yes	No	No	No
_mie_on	Yes	No	No	No
_mikey_state_logging	No	No	No	Yes
_mikey_verbose_logging	No	Yes	Yes	Yes
_minutes_to_standby	No	Yes	Yes	Yes
_mockup_mode	Yes	No	No	No
_nand_high_clock	Yes	Yes	Yes	Yes
_no_deepsleep	Yes	No	No	No	Preempted by _short_deepsleep.
_no_look_ahead_video_encoding	Yes	No	No	No
_no_vc0_autopower	Yes	No	No	No
_no_volume_control	Yes	No	No	No
_np_overlay_persist	No	Yes	Yes	Yes
_orient_me_not	Yes	No	No	No
_ped_event_logging	No	Yes	Yes	Yes
_ped_heartbeat	Yes	Yes	Yes	Yes
_ped_seconds_to_hibernate	No	Yes	Yes	Yes
_ped_steps_1000x	No	Yes	Yes	Yes
_ped_steps_100x	No	Yes	Yes	Yes
_ped_time_1000x	Yes	No	No	No
_ped_time_100x	Yes	No	No	No
_ped_time_10x	Yes	Yes	Yes	Yes
_ped_xyz_logging	Yes	Yes	Yes	Yes
_photo_albums_test	Yes	No	No	No
_power_testing	Yes	Yes	Yes	Yes
_pushui_app_icon_show	No	Yes	Yes	Yes
_quick_3bits	Yes	Yes	Yes	Yes	_enable_options not required.
_raw_uart_debug	No	Yes	Yes	Yes
_rds_robot	No	Yes	Yes	Yes
_rds_robot_internal	No	Yes	Yes	Yes
_record_max_16mb	Yes	No	No	No
_rental_notify_always	Yes	No	No	No
_reset_rtc	Yes	No	No	No
_seconds_to_graphics_off	No	Yes	Yes	Yes
_seconds_to_hibernation	No	Yes	Yes	Yes
_seconds_to_screen_off	No	Yes	Yes	Yes
_serial_acc_iap_status	Yes	No	No	No
_shake_data	Yes	No	No	No
_short_deepsleep	Yes	No	No	No
_show_autobaud	Yes	No	No	No
_show_bin_voltage	No	Yes	Yes	Yes
_show_brightness	Yes	No	No	No
_show_cache_size	Yes	No	No	No
_show_fixed_time	Yes	No	No	No
_show_fps	Yes	Yes	Yes	Yes
_show_headset_model	No	Yes	Yes	Yes
_show_max_battery	Yes	Yes	Yes	Yes
_show_memory	Yes	Yes	Yes	Yes
_show_numeric_volume	Yes	Yes	Yes	Yes	Displays numeric volume when changing volume.
_show_pll	Yes	Yes	Yes	Yes
_show_speed	Yes	No	No	No
_show_stuck_accelerometer_axis	No	No	Yes	Yes
_show_voltage	Yes	Yes	Yes	Yes	Displays battery voltage at bottom of screen.
_skipgamedrm	Yes	No	No	No	Seemingly allows Manifest.plist.p7b to not be present when reading eApps/games. If present, will still be checked.
_speed	Yes	No	No	No	File contents read (number likely expected). Default -1.
_springboard_always_hint	No	No	No	Yes
_springboard_fast_swipe_threshold	No	No	No	Yes
_springboard_tumbler_edit_mode	No	No	No	Yes
_springboard_tumbler_fast_swipe_decel_factor	No	No	No	Yes
_springboard_tumbler_slow_swipe_decel_factor	No	No	No	Yes
_springboard_tumbler_text_mode	No	No	No	Yes
_springboard_tumblermode	No	No	No	Yes
_sw_max_minutes	No	Yes	Yes	Yes
_sw_seconds_to_dim	No	Yes	Yes	Yes
_tcsize	Yes	No	No	No	File contents read (number likely expected).
_tgfx_benchmark	No	Yes	Yes	Yes
_thermal_Stress_enable	No	Yes	Yes	Yes
_tpodlogprint_to_uart	No	Yes	Yes	Yes
_try_spirit_codecs	Yes	No	No	No
_tuner_auto_scan	Yes	No	No	No
_tuner_blend_mono_threshold	No	Yes	Yes	Yes
_tuner_blend_stereo_threshold	No	Yes	Yes	Yes
_tuner_buffer_disable	No	Yes	Yes	Yes
_tuner_buffer_time_show	Yes	Yes	Yes	Yes
_tuner_hicut_disable	Yes	Yes	Yes	Yes
_tuner_metadata_events_show	Yes	Yes	Yes	Yes
_tuner_metadata_parsed_logging	Yes	Yes	Yes	Yes
_tuner_metadata_raw_logging	Yes	Yes	Yes	Yes
_tuner_metadata_rt_validation_off	No	Yes	Yes	Yes
_tuner_readings_logging	Yes	Yes	Yes	Yes
_tuner_readings_show	Yes	Yes	Yes	Yes
_tuner_region_worldwide_enable	No	Yes	Yes	Yes
_tuner_region_worldwide_force	No	Yes	Yes	Yes
_tuner_scan_logging	Yes	Yes	Yes	Yes
_tuner_scan_logging_start_delay	No	Yes	Yes	Yes
_tuner_softmute_disable	Yes	Yes	Yes	Yes
_tuner_volume_buttons_walk_frequency	No	Yes	Yes	Yes
_tvout_video_display	Yes	No	No	No
_tvoutwidescreen	Yes	No	No	No
_uart2_debug	Yes	No	No	No	Preempted by _uart30pin_debug.
_uart30pin_debug	Yes	No	No	No
_ultra_high_power	No	Yes	Yes	Yes
_usb_audio_authentication_optional	Yes	No	No	No
_usb_audio_lame_resampling	Yes	No	No	No
_usb_audio_negotiation_optional	Yes	No	No	No
_usb_audio_resampling_method	Yes	No	No	No
_usb_audio_samplerate_match_style	Yes	No	No	No
_usb_audio_show_status	Yes	No	No	No
_usb_audio_sinewave	Yes	No	No	No
_usb_audio_test_mode	Yes	No	No	No
_usb_hub_subclass	No	Yes	Yes	Yes
_usb_swap_configs	Yes	No	No	No
_use_SW_ALAC_decoder	No	Yes	Yes	Yes
_use_aac_encoder	Yes	No	No	No
_use_tdraw_in_tgfx	No	Yes	Yes	Yes
_volume_single_step	No	Yes	Yes	Yes
_vp_lang	Yes	No	No	No
_wheel_app_data	Yes	No	No	No
_wheel_raw_data	Yes	No	No	No
_writerawyuvstills	Yes	No	No	No