Two key events led Acorn down the path to ARM. One was the publication of a series of reports from the University of California, Berkeley, which suggested that a simple chip design could nevertheless have extremely high performance, much higher than the latest 32-bit designs on the market.[26] The second was a visit by Steve Furber and Sophie Wilson to the Western Design Center, a company run by Bill Mensch and his sister, which had become the logical successor to the MOS team and was offering new versions like the WDC 65C02. The Acorn team saw high school students producing chip layouts on Apple II machines, which suggested that anyone could do it.[27][28] In contrast, a visit to another design firm working on modern 32-bit CPU revealed a team with over a dozen members which were already on revision H of their design and yet it still contained bugs.[b] This cemented their late 1983 decision to begin their own CPU design, the Acorn RISC Machine.[29]

Acorn chose VLSI Technology as the "silicon partner", as they were a source of ROMs and custom chips for Acorn. Acorn provided the design and VLSI provided the layout and production. The first samples of ARM silicon worked properly when first received and tested on 26 April 1985.[3] Known as ARM1, these versions ran at 6 MHz.[35]


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The result of the simulations on the ARM1 boards led to the late 1986 introduction of the ARM2 design running at 8 MHz, and the early 1987 speed-bumped version at 10 to 12 MHz.[c] A significant change in the underlying architecture was the addition of a Booth multiplier, whereas formerly multiplication had to be carried out in software.[37] Further, a new Fast Interrupt reQuest mode, FIQ for short, allowed registers 8 through 14 to be replaced as part of the interrupt itself. This meant FIQ requests did not have to save out their registers, further speeding interrupts.[38]

In 1994, Acorn used the ARM610 as the main central processing unit (CPU) in their RiscPC computers. DEC licensed the ARMv4 architecture and produced the StrongARM.[50] At 233 MHz, this CPU drew only one watt (newer versions draw far less). This work was later passed to Intel as part of a lawsuit settlement, and Intel took the opportunity to supplement their i960 line with the StrongARM. Intel later developed its own high performance implementation named XScale, which it has since sold to Marvell. Transistor count of the ARM core remained essentially the same throughout these changes; ARM2 had 30,000 transistors,[51] while ARM6 grew only to 35,000.[52]

Since 1995, various versions of the ARM Architecture Reference Manual (see  External links) have been the primary source of documentation on the ARM processor architecture and instruction set, distinguishing interfaces that all ARM processors are required to support (such as instruction semantics) from implementation details that may vary. The architecture has evolved over time, and version seven of the architecture, ARMv7, defines three architecture "profiles":

Thumb-2 extends the Thumb instruction set with bit-field manipulation, table branches and conditional execution. At the same time, the ARM instruction set was extended to maintain equivalent functionality in both instruction sets. A new "Unified Assembly Language" (UAL) supports generation of either Thumb or ARM instructions from the same source code; versions of Thumb seen on ARMv7 processors are essentially as capable as ARM code (including the ability to write interrupt handlers). This requires a bit of care, and use of a new "IT" (if-then) instruction, which permits up to four successive instructions to execute based on a tested condition, or on its inverse. When compiling into ARM code, this is ignored, but when compiling into Thumb it generates an actual instruction. For example:

VLC appears to occasionally have build issues on F-Droid. This then means that it gets moved to the F-Droid archive repo when the latest successful build gets old. This then gets fixed (eventually) and the app gets moved to the main repo (even more eventually). The last update to 3.0.13 in archive landed about a week ago, so enabling the archive repo may be an option (though at some point VLC is likely to end up back in main anyway). On my FP1 F-Droid shows armeabi-v7a versions.

ARMv7a + ARMv8a packages => it has both ARMv7a and v8a binaries of that app bundled, so it installs the 32-bit version (ARMv7a) of the package if the device has an ARMv7 SoC or the 64-bit version if the device has an ARMv8 SoC.

-mtune=generic-arch specifies that GCC should tune theperformance for a blend of processors within architecture arch.The aim is to generate code that run well on the current most popularprocessors, balancing between optimizations that benefit some CPUs in therange, and avoiding performance pitfalls of other CPUs. The effects ofthis option may change in future GCC versions as CPU models come and go.

Tells the compiler to perform function calls by first loading theaddress of the function into a register and then performing a subroutinecall on this register. This switch is needed if the target functionlies outside of the 64-megabyte addressing range of the offset-basedversion of subroutine call instruction.

Download the latest version of the packages available above.If it has different OSes, choose one that match your development OS.After finished, you can DISCONNECT any internet connections.Locate the downloaded .zip pacakge into accessible location, as you will need that location for installation purpose.Open up CLI/CMD, for Windows make sure you have WSL or Bash for Windows support.Now follow the steps below, it mimics CMD interface to make it easier for you:

cd $ANDROID_SDK_ROOT

First, go to the root directory of Android SDK installation. On Windows you might also type:cd %ANDROID_SDK_ROOT%

Remember! You should only proceed to the next step if only you already in the root directory of Android SDK.Now, from rootdir of Android SDK, locate the package you've downloaded and then extract the package based on your OS.

Make sure to change the /path/to/ with absolute path that points to actual downloaded package file location on your local disk.[all OSes]

rm -rf system-images/android-25/google_apis/armeabi-v7a && unzip path/to/armeabi-v7a-25_r18.zip -d system-images/android-25/google_apis

 extract the package archive as-is from the root SDK directory, to install version 25.18 on all OSes[all OSes]

rm -rf system-images/android-25/google_apis/armeabi-v7a && unzip path/to/armeabi-v7a-23_r33.zip -d system-images/android-23/google_apis

 extract the package archive as-is from the root SDK directory, to install version 23.33 on all OSes[all OSes]

rm -rf system-images/android-25/google_apis/armeabi-v7a && unzip path/to/armeabi-v7a-22_r26.zip -d system-images/android-22/google_apis

 extract the package archive as-is from the root SDK directory, to install version 22.26 on all OSes[all OSes]

rm -rf system-images/android-25/google_apis/armeabi-v7a && unzip path/to/armeabi-v7a-21_r32.zip -d system-images/android-21/google_apis

 extract the package archive as-is from the root SDK directory, to install version 21.32 on all OSes[all OSes]

rm -rf system-images/android-25/google_apis/armeabi-v7a && unzip path/to/armeabi-v7a-19_r40.zip -d system-images/android-19/google_apis

 extract the package archive as-is from the root SDK directory, to install version 19.40 on all OSes[all OSes]

rm -rf system-images/android-25/google_apis/armeabi-v7a && unzip path/to/armeabi-v7a-18_r06.zip -d system-images/android-18/google_apis

 extract the package archive as-is from the root SDK directory, to install version 18.6 on all OSes[all OSes]

rm -rf system-images/android-25/google_apis/armeabi-v7a && unzip path/to/armeabi-v7a-17_r06.zip -d system-images/android-17/google_apis

 extract the package archive as-is from the root SDK directory, to install version 17.6 on all OSes[all OSes]

rm -rf system-images/android-25/google_apis/armeabi-v7a && unzip path/to/armeabi-v7a-16_r06.zip -d system-images/android-16/google_apis

 extract the package archive as-is from the root SDK directory, to install version 16.6 on all OSes[all OSes]

rm -rf system-images/android-25/google_apis/armeabi-v7a && unzip path/to/armeabi-v7a-15_r06.zip -d system-images/android-15/google_apis

 extract the package archive as-is from the root SDK directory, to install version 15.6 on all OSes[all OSes]

rm -rf system-images/android-25/google_apis/armeabi-v7a && unzip path/to/armeabi-v7a-10_r06.zip -d system-images/android-10/google_apis

 extract the package archive as-is from the root SDK directory, to install version 10.6 on all OSesDONE! :D

With the embed Android 4.0.2+ app, there are various versions which are suited to different Android devices. If you're installing embed via the Play Store, the version will be served automatically to suit your device. However, if you're side loading the app to the device, you'll need to make sure you've got the right apk version.

Starting with the release of Android Lollipop, the process of installing the Xposed Framework got a bit more complicated. Not only are there separate installers for each Android version, but now, you also need to know exactly what type of processor is in your device to make sure you're downloading the right files. In fact, CPU architecture is becoming a factor in more and more scenarios these days, including certain sideloaded app updates and, of course, custom ROMs. ff782bc1db

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