androidarchitecturearmcortex-aarm7

What is my architecture and what does armv8l exactly means?

Firstly, I searched (a lot) and I'm confused about my Android architecture.

The main ways that I used are:

  1. The uname -m command says that I'm using armv8l.
  2. The dpkg --print-architecture command says that I'm using arm
  3. The lscpu shows this output:
~ $ lscpu
Architecture:           armv8l
Byte Order:             Little Endian
CPU(s):                 8
On-line CPU(s) list:    0-3
Off-line CPU(s) list:   4-7
Vendor ID:              ARM
Model name:             Cortex-A53                                              Model:                  4
Thread(s) per core:     1
Core(s) per socket:     4
Socket(s):              1
Stepping:               r0p4
CPU(s) scaling MHz:     79%
CPU max MHz:            1586.0000
CPU min MHz:            0.0000
Flags:                  half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 id                        iva idivt lpae evtstrm aes pmull sha1 sha2 crc32
  1. The cat /proc/cpuinfo shows this output:
~ $ cat /proc/cpuinfo
processor       : 0
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt lpae evtstrm aes pmull sha1 sha2 crc32
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd03                                                     CPU revision    : 4

processor       : 1
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt lpae evtstrm aes pmull sha1 sha2 crc32
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd03                                                     CPU revision    : 4

processor       : 2
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt lpae evtstrm aes pmull sha1 sha2 crc32
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

processor       : 3
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt lpae evtstrm aes pmull sha1 sha2 crc32
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4
  1. AIDA64 (Device info app) shows me in the CPU section:

enter image description here

And lscpu says that I'm using Cortex-A53 model, and according to Cortex-A53 it's says that I'm using ARMv8-A 64-bit.

So, I don't know exactly what my Android arch is, like when I install node.js or other packages or binary files, do I install it in armv7l or armv8 (arm64) from node.js dist?

And I know installing node.js manually in Android is not really supported, or I don't know how to do it.

If anyone has a question, I'm ready for answering.

Thanks for all.

Solution

  • The other answers are right, but here is some more background that may help your understanding.

    The original ARM architecture was 32 bits. Starting with ARMv8, a 64-bit instruction set is also supported. ARMv8-A CPUs are supposed to support both modes, so such a chip effectively gives you two architectures in one. Generally arm or aarch32 refers to the 32-bit mode, and arm64 or aarch64 for the 64-bit mode.

    The armv8l mode in uname means your kernel is built to run on an ARMv8 chip in its 32-bit mode. (A kernel built for the 64-bit mode would say arm64 here.) The l stands for "little endian"; the architecture supports both little-endian and big-endian modes, with little-endian being much more widely used. armv8b would be 32-bit big-endian mode.

    The lscpu and /proc/cpuinfo data are directly querying the capabilities of your CPU hardware. The Cortex A-53 is a full ARMv8-A implementation and they are correctly telling you that it physically supports a 64-bit mode.

    The uname -m and dpkg --print-architecture commands are querying the operating system, not the hardware. So they say you are running a 32-bit kernel and OS. Thus you are not able to use the 64-bit mode with this kernel/OS install. For all intents and purposes, right now you have a 32-bit arm / aarch32 CPU.

    The ARMv8 architecture is backwards compatible with ARMv7, so your armv7l node package will run on it. The armv8/arm64 package will not, unless you want to reinstall the entire OS first.