Last Updated on 2022 年 8 月 3 日 by 小編

Raspberry Pi 4/8GB 出來了！ Pi 4B 從 2019 年發表後，在 2020 年 3 月份有小改版。在 2020/05/28 樹莓派基金會又推出 Pi 4B 的 8G 版本，到底又有哪些改變呢？

Raspberry Pi 4/8GB 硬體更新整理

• 使用 Micron 的 LPDDR4 SDRAM 記憶體 8GB，而 BCM2711 可定址到 16GB。
• 增加新的開關電源(switcher)來取代原本的開關模式電源(Switch Mode Power Supply)。

Raspberry Pi 4/8GB 新增的開關電源設計

左圖是原本 Pi4/1GB/2GB/4GB 的電路設計。右圖是 Pi4/8GB 新增的開關電源設計。

硬體差異比較

有關硬體的差異可以看下圖的比較。上方是 Pi4/1GB/2GB/4GB，下方是 Pi4/8GB 的電路板。

Raspberry Pi 4/8GB 軟體更新

• 官方版本的 Raspberry Pi OS(原名稱為 Raspbian)，不過目前還是 32-bit。
• 可搭配 64-bit 的作業系統，例如 Ubuntu 20.04 LTS 或是 Gentoo。
• 持續更新 Vulkan 驅動程式，並且開源。

Release Notes

新版本(2020-05-27-raspios)的 Raspberry Pi OS也一併釋出。release notes 如下：

2020-05-27:
  * Added Bookshelf application
  * Added Raspberry Pi Diagnostics application
  * Added magnifier plugin to taskbar - needs magnifier application installed from Recommended Software to enable
  * Added Magnifier application to Recommended Software
  * Added marketing questionnaire as initial Chromium tab
  * Version 0.25 of Scratch 2 included - uses external application to access IMU on SenseHAT
  * Version 1.0.5 of Scratch 3 included - uses external application to access IMU on SenseHAT
  * Version 32.0.0.371 of Flash player included
  * Version 1.0.6 of Node-RED included
  * Version 6.7.1 of VNC Server included
  * Version 6.20.113 of VNC Client included
  * Internal audio outputs enabled as separate ALSA devices
  * MagPi preinstall removed and replaced with Beginner’s Guide
  * MagPi weblink removed from main menu
  * Chromium made default application for PDF files
  * Common icon loading code for lxpanel plugins used
  * Italian translations added
  * Initial move of mouse pointer to menu button disabled
  * Padding at left of menu button removed
  * Focus behaviour changed so that focus moves to desktop if no windows are opened - improves reliability of Orca screen reader
  * Bug fix - focus bug in volume plugin
  * Bug fix - keyboard repeat interval bug in Mouse & Keyboard Settings
  * Bug fix - battery detection bug in battery plugin
  * Bug fix - spurious active areas on taskbar when plugins are hidden
  * Bug fix - occasional crash in file manager on file selection
  * Disk ID is now regenerated on first boot
  * Updated udev rules
    - Remove unused argon rule
    - Add vcsm-cma to video group
    - Add pwm to gpio group
  * i2cprobe: More flexible I2C/SPI alias mapping
  * Raspberry Pi firmware 21e1fe3477ffb708a5736ed61a924fd650031136
  * Linux kernel 4.19.118

相關新聞

• 8GB Raspberry Pi 4 on sale now at $75
• Raspberry Pi 4 Gets 8GB RAM, Raspbian 64-bit (Beta)

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