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*[[boot2]] bootstrap then loads the embedded ELF file
The [[Hollywood]] includes an ARM9 core to handle I/O and security, nicknamed the '''Starlet''' by [[fail0verflow]], but internally known as the '''IOP''', short for Input/Output Processor.
The [[Hollywood]] includes an ARM9 core to handle I/O and security, nicknamed the '''Starlet''' by [[fail0verflow]], but internally known as the '''IOP''', short for Input/Output Processor.
This is a very interesting piece of hardware, as it basically does everything that makes a Wii different from a GameCube.
This is a very interesting piece of hardware, as it basically does everything that makes a Wii different from a GameCube.
+
+The Starlet contains an internal 96KB SRAM; if [[IOS]] needs more memory, it can lock part of MEM2 to prevent [[Broadway]] access.
''Note: this page is incomplete. Please expand it as you see fit!''
''Note: this page is incomplete. Please expand it as you see fit!''
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* ARM and thumb instruction set
* ARM and thumb instruction set
* Clocked at 243MHz (Hollywood clock)
* Clocked at 243MHz (Hollywood clock)
+
+== Exceptions ==
+Exception vectors are located at <code>ffff0000</code>. Each exception is given 4 bytes, and usually branches elsewhere.
+
+{| class="wikitable"
+! Index
+! [[mini]] name
+! Description
+|-
+| 0
+| v_reset
+| Hardware reset. Typically the entrypoint for official software.
+|-
+| 1
+| v_undf
+| Undefined instruction, used as handler for [[IOS/Syscalls|IOS syscalls]]
+|-
+| 2
+| v_swi
+| SVC/SWI instruction, used for [[IOS/Syscalls#Syscalls_.28via_ARM_syscall_instruction.29|IOS SWI syscalls]]
+|-
+| 3
+| v_instr_abrt
+| Instruction abort
+|-
+| 4
+| v_data_abrt
+| Data abort
+|-
+| 5
+| v_reserved
+| Reserved
+|-
+| 6
+| v_irq
+| [[Hollywood/IRQs|IRQ]]
+|-
+| 7
+| v_fiq
+| FIQ
+|}
== Boot ==
== Boot ==
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*Starlet boots from an internal Mask ROM, BOOT0 (about 1300 bytes of code out of 4K possible)
*Starlet boots from an internal Mask ROM, BOOT0 (about 1300 bytes of code out of 4K possible)
−*[[boot0]] decrypts, verifies, and runs the first few blocks of NAND, BOOT1 (up to the first 48 pages of flash)
+*[[boot0]] decrypts, verifies, and runs the first few blocks of NAND, BOOT1 (up to the first 47 pages of flash)
−* [[boot1]] locates, loads, decrypts, verifies, and runs BOOT2
+*[[boot1]] locates, loads, decrypts, verifies, and runs BOOT2
−*[[boot2]] starts the IOS
*[[boot2]] starts the IOS
−*[[IOS]] loads code into the EXI buffer and bootstraps the {{hw|Broadway}}
+*[[IOS]] loads [[System Menu]] into memory and bootstraps the {{hw|Broadway}} using the [[Hardware/External_Interface#EXI_boot_vector|EXI boot vector]]
== Links ==
== Links ==
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* [[ARM Binaries]] - the formats used for Starlet executable code
* [[ARM Binaries]] - the formats used for Starlet executable code
* [[WAD Files]] are used for BOOT2 and the IOS
* [[WAD Files]] are used for BOOT2 and the IOS
+* [https://www.freepatentsonline.com/y2005/0132217.html Patent for Starlet and IOS]
[[Category:Hardware]]
[[Category:Hardware]]