ARM Cortex-A72 CPU All In One

xgqfrms / 2023-05-27 / 原文

ARM Cortex-A72 CPU All In One

Raspberry Pi 4B, BCM2711 4 核心 1.5GHz 64 位 CPU / Raspberry Pi 4B, BCM2711 4 核心 1.8GHz 64 位 CPU

Cortex-A72

https://developer.arm.com/Processors/Cortex-A72

https://developer.arm.com/documentation/100095/0003/Introduction/About-the-Cortex-A72-processor?lang=en

https://www.anandtech.com/show/9184/arm-reveals-cortex-a72-architecture-details

https://www.anandtech.com/show/8957/arm-announces-cortex-a72

CPU 性能分析

https://www.cpubenchmark.net/cpu.php?cpu=ARM+Cortex-A72+4+Core+1500+MHz&id=3917

Raspberry Pi 4B

https://www.raspberrypi.com/news/raspberry-pi-4-on-sale-now-from-35/

https://www.raspberrypi.com/news/8gb-raspberry-pi-4-on-sale-now-at-75/

1.5GHz => 1.8GHz 超频 🚀

# config.txt
arm_freq=1800

https://www.raspberrypi.com/news/bullseye-bonus-1-8ghz-raspberry-pi-4/

$ cat /proc/cpuinfo

# Raspberry Pi 3 Model B Rev 1.2
$ cat /sys/firmware/devicetree/base/model

# Raspberry Pi 4B

# Raspberry Pi 3B
Hardware	: BCM2835
Revision	: a22082
Serial		: 0000000095bf9be6
Model		: Raspberry Pi 3 Model B Rev 1.2

#include <stdio.h>
#include <stdlib.h>

int main( int argc, char *argv[] )
{
  FILE *fp;
  char revcode[32];

  fp = popen("cat /proc/cpuinfo | awk '/Revision/ {print $3}'", "r");
  if (fp == NULL)
    exit(1);
  fgets(revcode, sizeof(revcode), fp);
  pclose(fp);

  int code = strtol(revcode, NULL, 16);
  int new = (code >> 23) & 0x1;
  int model = (code >> 4) & 0xff;
  int mem = (code >> 20) & 0x7;

  if (new && model == 0x11 && mem >= 3)  // Note, 3 in the mem field is 2GB
     printf("We are a 4B with at least 2GB of RAM!\n" );

  return 0;
}

import subprocess

cmd = "cat /proc/cpuinfo | awk '/Revision/ {print $3}'"
revcode = subprocess.check_output(cmd, shell=True)

code = int(revcode, 16)
new = (code >> 23) & 0x1
model = (code >> 4) & 0xff
mem = (code >> 20) & 0x7

if new and model == 0x11 and mem >= 3 : # Note, 3 in the mem field is 2GB
    print("We are a 4B with at least 2GB RAM!")

https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#raspberry-pi-revision-codes