What is RT Buddy v2, Apple Sandollar, AppleS5L8940XI2CController?

can somebody tell me specifically what these things are?


they never appeared in analytical data now it does.


please help and just answer the question. What is this stuff??


rt buddy v2??


iPhone 7 Plus, iOS 14

Posted on Dec 14, 2020 7:24 AM

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Posted on Mar 7, 2021 5:25 PM

Good point Lawrence. Simply reading the logs is an exercise in futility to understand them. I only know some of those things due to my curiosity with the MacOS, iOS and iPadOS beta programs I participate in with my older (non-essential) hardware. Especially when something novel comes out, like Secure Enclave, or the first time iOS had to build in support for NFC - then I like to explore to see what I can learn.


I’ve always been curious about the OS side of computing, mainly because I know so little actually about it. But I know enough to know I wouldn’t have a clue if there was anything unexpected buried in those logs.

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Mar 7, 2021 5:25 PM in response to Lawrence Finch

Good point Lawrence. Simply reading the logs is an exercise in futility to understand them. I only know some of those things due to my curiosity with the MacOS, iOS and iPadOS beta programs I participate in with my older (non-essential) hardware. Especially when something novel comes out, like Secure Enclave, or the first time iOS had to build in support for NFC - then I like to explore to see what I can learn.


I’ve always been curious about the OS side of computing, mainly because I know so little actually about it. But I know enough to know I wouldn’t have a clue if there was anything unexpected buried in those logs.

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Mar 7, 2021 4:46 PM in response to Michael Black

Michael Black wrote:

Unless you have a degree in computer hardware engineering, almost nothing in those logs will make sense to you.

Actually, they won’t even make sense to Apple engineers unless they have a copy of the iOS Data Dictionary. And even they, with the Data Dictionary, don’t read the logs. They process them with a log analyzer that reports anything unusual.

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Mar 7, 2021 4:58 PM in response to dukedukem

Unless you have a degree in computer hardware engineering, almost nothing in those logs will make sense to you. RT Buddy is part of the kernel, loading during boot on every iPhone, iPad and Mac. I don’t know exactly what is does but it is part of the hardware initialization steps towards the end of the kernel boot process.


And yes, Apple devices do use chips made by Samsung. Also ones made by Texas Instruments, Panasonic, and other companies that make various controller and other chipsets. They may also use RAM & DRAM chips made by Samsung.


The Samsung SPI Controller is a common hardware system on many devices, and controls the I/O with things like USB flash drives, displays controllers or anything that uses the SPI (serial peripheral interface) comm interface standard.


Sandollar has been around since the introduction of NFC payment processing and has something to do with security or token authentication or some such aspect of NFC system.


So you’re asking about things that are at the extreme of the spectrum of obscure and more often than not tightly guarded proprietary systems developed by Apple (and code named by them, or the companies that make the proprietary components that Apple uses. Your never going to find details about them as those details are not made public by the companies that own the IP and technology.

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What is RT Buddy v2, Apple Sandollar, AppleS5L8940XI2CController?

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