Difference between revisions of "Hardware/Starlet"

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(Added what IOP stands for, since the Starbuck on the Wii U is also known as IOP according to Wikipedia, and Wikipedia states that IOP is short for Input/Output Processor)
 
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The [[Hollywood]] includes an ARM9 core to handle I/O and security, nicknamed the '''Starlet'''.
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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.
  
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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].
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* 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
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* ARM and thumb instruction set
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* Clocked at 243MHz (Hollywood clock)
  
 
== Boot ==
 
== Boot ==
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{{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)
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*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)
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*[[boot0]] decrypts, verifies, and runs the first few blocks of NAND, BOOT1 (up to the first 48 pages of flash)
* BOOT1 locates, loads, decrypts, verifies, and runs BOOT2
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* [[boot1]] locates, loads, decrypts, verifies, and runs BOOT2
* The BOOT2 bootstrap then loads the embedded ELF file.
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*[[boot2]] bootstrap then loads the embedded ELF file
* BOOT2 starts the IOS.
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*[[boot2]] starts the IOS
* IOS loads code into the EXI buffer and bootstraps the {{hw|Broadway}}
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*[[IOS]] loads code into the EXI buffer and bootstraps the {{hw|Broadway}}
  
 
== 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
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* [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.
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* [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
[[Category:Wii_Hardware]]
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[[Category:Hardware]]

Latest revision as of 01:11, 1 May 2021

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.

Note: this page is incomplete. Please expand it as you see fit!

Specs

  • NEC ARM926EJ-S SoC. See also ChipWorks.
  • Big endian for compatibility with the Broadway
  • ARM and thumb instruction set
  • Clocked at 243MHz (Hollywood clock)

Boot

See also: boot process

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)
  • boot0 decrypts, verifies, and runs the first few blocks of NAND, BOOT1 (up to the first 48 pages of flash)
  • boot1 locates, loads, decrypts, verifies, and runs BOOT2
  • boot2 bootstrap then loads the embedded ELF file
  • boot2 starts the IOS
  • IOS loads code into the EXI buffer and bootstraps the Broadway

Links

More information about the Starlet: