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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'''.
+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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== Specs ==
== Specs ==
−* NEC ARM926EJ-S SoC. See also [http://www.chipworks.com/seamark.aspx?sm=s4%3BDatedfl14%3BDeviceCategory6%3BMemoryfl10%3BReportCode12%3BCAR-0703-201&cw=detail ChipWorks].
+* NEC ARM926EJ-S SoC. See also [https://www.techinsights.com/products/nec-c10046f5-211-pn2-circuit-analysis-report ChipWorks].
* Big endian for compatibility with the Broadway
* Big endian for compatibility with the Broadway
−* ARM thumb instructions
+* ARM and thumb instruction set
+* 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 ==
+{{Seealso|boot process}}
Starlet is the first processor to run code in the Wii.
Starlet is the first processor to run code in the Wii.
*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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* [http://infocenter.arm.com/help/topic/com.arm.doc.ddi0198d/DDI0198_926_TRM.pdf ARM926EJ-S Technical Reference Manual] - CPU, MMU, Cache specs and programmer's interface
* [http://infocenter.arm.com/help/topic/com.arm.doc.ddi0198d/DDI0198_926_TRM.pdf ARM926EJ-S Technical Reference Manual] - CPU, MMU, Cache specs and programmer's interface
−* [http://rtds.cs.tamu.edu/web_462/techdocs/ARM/cores/DDI0222B_9EJS_r1p2.pdf ARM9EJ-S Technical Reference Manual] - CPU specs and programmer's interface
+* [https://web.archive.org/web/20050308211243/http://www.arm.com:80/pdfs/DDI0222B_9EJS_r1p2.pdf ARM9EJ-S Technical Reference Manual] - CPU specs and programmer's interface
−* [http://www.arm.com/miscPDFs/14128.pdf ARM Architecture Reference Manual] - Documentation about the ARMv5 architecture.
+* [https://web.archive.org/web/20081221072959/http://www.arm.com/miscPDFs/14128.pdf ARM Architecture Reference Manual] - Documentation about the ARMv5 architecture.
* [[IOS]] - the OS that runs on the Starlet and handles calls from the Broadway during game execution and while in the system menu.
* [[IOS]] - the OS that runs on the Starlet and handles calls from the Broadway during game execution and while in the system menu.
* [[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]]