SummerCart64/docs/04_config_options.md

• Supported config options
  • 0: BOOTLOADER_SWITCH
  • 1: ROM_WRITE_ENABLE
  • 2: ROM_SHADOW_ENABLE
  • 3: DD_MODE
  • 4: ISV_ADDRESS
  • 5: BOOT_MODE
  • 6: SAVE_TYPE
  • 7: CIC_SEED
  • 8: TV_TYPE
  • 9: DD_SD_ENABLE
  • 10: DD_DRIVE_TYPE
  • 11: DD_DISK_STATE
  • 12: BUTTON_STATE
  • 13: BUTTON_MODE
  • 14: ROM_EXTENDED_ENABLE
• Supported persistent setting options
  • 0: LED_ENABLE

---

Supported config options

SC64 provides simple flashcart configuration by exposing various options settable by both USB and N64 side. All options other than BOOTLOADER_SWITCH are preserved on console reset or power cycle (only when powered from USB).

id	name	type	description
0	BOOTLOADER_SWITCH	bool	Switches between bootloader and ROM mapping on PI address 0x1000_0000
1	ROM_WRITE_ENABLE	bool	Enables write access to ROM section
2	ROM_SHADOW_ENABLE	bool	Enables overlapping last 128 kiB of ROM section by flash memory
3	DD_MODE	enum	Enables 64DD register/IPL access
4	ISV_ADDRESS	dword	Sets IS-Viewer 64 watch address
5	BOOT_MODE	enum	Controls bootloader behavior
6	SAVE_TYPE	enum	Sets supported save type
7	CIC_SEED	word	Sets CIC seed value passed by bootloader to IPL3
8	TV_TYPE	enum	Sets TV type value passed by bootloader to IPL3
9	DD_SD_ENABLE	bool	Controls 64DD block request passing to USB or SD card
10	DD_DRIVE_TYPE	enum	Sets 64DD drive type
11	DD_DISK_STATE	enum	Sets current 64DD disk state
12	BUTTON_STATE	bool	Gets button press value
13	BUTTON_MODE	enum	Sets button press behavior
14	ROM_EXTENDED_ENABLE	bool	Enables access to extended ROM memory located in flash

---

0: BOOTLOADER_SWITCH

type: bool | default: 1

• 0 - ROM data is mapped on PI address 0x1000_0000
• 1 - Bootloader data is mapped on PI address 0x1000_0000

Used internally to remap ROM data after bootloader is loaded.

---

1: ROM_WRITE_ENABLE

type: bool | default: 0

• 0 - ROM write access is disabled
• 1 - ROM write access is enabled

Used by homebrew applications to freely replace data in SDRAM from N64 side.

---

2: ROM_SHADOW_ENABLE

type: bool | default: 0

• 0 - Last 128 kiB of ROM section is mapped to SDRAM
• 1 - Last 128 kiB of ROM section is mapped to flash

Last 128 kiB of SDRAM is shared between ROM data and SRAM/FlashRAM save data. Use this setting for applications requiring all of ROM section space including last 128 kiB. Check PI memory map for more information.

---

3: DD_MODE

type: enum | default: 0

• 0 - 64DD support is disabled
• 1 - 64DD registers are mapped on PI address space
• 2 - 64DD IPL is mapped on PI address space
• 3 - Both 64DD registers and IPL are mapped on PI address space

Use this config for setting level of 64DD emulation.

---

4: ISV_ADDRESS

type: dword | default: 0x0000_0000

• 0x0000_0000 - IS-Viewer 64 is disabled
• 0x0000_0004 to 0x03FF_FFFC - IS-Viewer 64 is enabled

Sets IS-Viewer 64 listening address starting from ROM base. For most applications this offset is fixed at 0x03FF_0000. Address must be 4-byte aligned. Command will return error when setting incorrect value. Small number of games have support for changing this address (for example debug builds of TLoZ: MM).

---

5: BOOT_MODE

type: enum | default: 0

• 0 - Load menu from SD card
• 1 - Attempt to boot application loaded in ROM section
• 2 - Attempt to boot 64DD IPL
• 3 - Direct ROM mode, skips bootloader entirely
• 4 - Direct 64DD IPL mode, skips bootloader entirely

Use this setting to change boot behavior. Value 3 or 4 (direct boot) will always keep BOOTLOADER_SWITCH option disabled. Value 4 will set CIC emulation to 64DD mode

---

6: SAVE_TYPE

type: enum | default: 0

• 0 - All saves are disabled
• 1 - EEPROM 4 kib save is enabled
• 2 - EEPROM 16 kib save is enabled
• 3 - SRAM 256 kib save is enabled
• 4 - FlashRAM 1 Mib save is enabled
• 5 - SRAM 768 kib save is enabled

Use this setting for selecting save type that will be emulated. Only one save type can be enabled. Any successful write to this config will disable automatic save writeback to SD card when previously enabled.

---

7: CIC_SEED

type: word | default: 0xFFFF

• 0x0000 to 0x00FF - Specified CIC seed value will be used
• 0xFFFF - CIC seed value will be autodetected

Use this setting to force specific CIC seed. By setting value 0xFFFF bootloader will try to guess needed values from loaded ROM IPL3. This setting is not used when BOOT_MODE is set to 3 or 4 (direct boot).

---

8: TV_TYPE

type: enum | default: 3

• 0 - PAL TV type will be used
• 1 - NTSC TV type will be used
• 2 - MPAL TV type will be used
• 3 - TV type will be autodetected

Use this setting to force specific TV type. By setting value 3 bootloader will try to guess TV type from loaded ROM header. This setting is not used when BOOT_MODE is set to 3 or 4 (direct boot).

---

9: DD_SD_ENABLE

type: bool | default: 0

• 0 - 64DD block requests are passed to USB interface
• 1 - 64DD block requests are passed to SD card

Use this setting to change where 64DD emulation will be passing incoming block R/W requests.

---

10: DD_DRIVE_TYPE

type: enum | default: 0

• 0 - Retail 64DD drive type ID is selected
• 1 - Development 64DD drive type ID is selected

Use this setting to change 64DD drive type emulation.

---

11: DD_DISK_STATE

type: enum | default: 0

• 0 - 64DD disk state is set to ejected
• 1 - 64DD disk state is set to inserted
• 2 - 64DD disk state is set to changed

Use this setting to change 64DD current disk state.

---

12: BUTTON_STATE

type: bool | default: x | read-only

• 0 - Button is not pressed
• 1 - Button is pressed

This is special read-only option for getting button press state. Setting this option will return error.

---

13: BUTTON_MODE

type: enum | default: 0

• 0 - Button press does nothing
• 1 - Button press raises N64 interrupt
• 2 - Button press sends USB packet
• 3 - Button press changes 64DD disk

Use this setting to change button behavior. Regardless of this setting button state can always be checked by reading BUTTON_STATE config.

---

14: ROM_EXTENDED_ENABLE

type: bool | default: 0

• 0 - ROM extended PI access is disabled
• 1 - ROM extended PI access is enabled

Use this setting to enable PI access for extended ROM data located inside flash memory.

---

Supported persistent setting options

These options are similar to config options but state is persisted through power cycles. Setting are kept in RTC backup memory and require battery to be installed for correct operation.

id	name	type	description
0	LED_ENABLE	bool	Enables or disables LED I/O activity blinking

---

0: LED_ENABLE

type: bool | default: 1

• 0 - LED I/O activity blinking is disabled
• 1 - LED I/O activity blinking is enabled

Use this setting to enable or disable LED I/O activity blinking.