《深入研究》
因為 Zero 系列是單面組件放置,過去 Zero/Zero W 使用 Broadcom BCM2835 SoC (ARM1176JZF-S 單核心),其 SoC 和 SDRAM 使用 package-on-package(PoP)封裝技術,可以將 SDRAM 封裝直接位於 SoC 的頂部,看起來像是這樣。
圖片來源:New product: Raspberry Pi Zero 2 W on sale now at $15
而 Zero 2 W 使用四個 Cortex-A53 核心,因為四核心的處理電路面積會超過原本的大小,無法直接使用原本的 PoP 技術,因此在 Pi 2 以後的樹莓派都是將 SoC 和 SDRAM 分離。
但隨著半導體技術的演進,在 2011 年的 BCM2763 曾使用 system-in-package (SiP)封裝技術(將 128MB SDRAM 和 SoC 晶片直接封裝在一起)又被應用在這次的 Zero 2 W。這次的封裝技術 RP3A0 是新一代的 SiP,可結合 BCM2710A1 晶片和 4Gbit Micron LPDDR2,看起來像是這樣。
圖片來源:New product: Raspberry Pi Zero 2 W on sale now at $15
The 33th the Raspberry Pi meetup, the topic is “Raspberry Pi 4 + Ubuntu and Boot Analysis”.
Speaker 1: Taiten(Canonical)
Topic:Snap your application for embedded system
1) Snap and Ubuntu Store for IoT
2) Snap vs Docker
3) Snap your app demo
Speaker 2: StarNight
Topic: A journey to boot Linux on Raspberry Pi
Outline:
I will share several possible boot process of Linux distribution on Raspberry Pi, and the boot process of a Linux distribution with OSTree technology. Take Endless OS booting on Raspberry Pi as an example.
Lightning Talk 1: Alvin(Creative5)
Topic: Running Compal 5G module on Raspberry Pi 4
第三十三次 Raspberry Pi 社群聚會,希望能透過社群活動的分享和交流,找到更多 Raspberry Pi 的可能。本次主題是「Raspberry Pi 4 + Ubuntu 和系統開機分析 」。
分享者1:Taiten(Canonical)
題目:Snap your application for embedded system
1) Snap and Ubuntu Store for IoT
2) Snap vs Docker
3) Snap your app demo
分享者2:StarNight
題目:A journey to boot Linux on Raspberry Pi
大綱:本次將分享幾個 Linux distribution 在 Raspberry Pi 的可能開機過程,以及自己實做一個搭配 OSTree 技術的 Linux distribution 的開機流程。以 Endless OS 在 Raspberry Pi 上開機為例。
透過觀察幾個 Linux distribution 的開機過程,發現 U-Boot 可以做到將開機過程分為「高度硬體相關」與「一般系統皆可通用」的兩大步驟。特別是「一般系統皆可通用」的開機步驟,滿足搭配 OSTree 技術的系統(包含,但不限於)有方便、一致的開機模式需求。更進一步,有機會解決各硬體專屬 Device Tree 的佈署問題。
這次將分享如何實做讓系統在 Raspberry Pi 上開機的過程!
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
Pi 3B+ 這次新增了 MaxLinear MxL7704 電源管理 IC,可有更好的溫度管理策略。例如在 70°C 以下可以使用 1.4GHz 全速運轉;但超過了 70°C 就會降到 1.2GHz 的速度。可用 Sysbench 看溫度/頻率的曲線圖。
圖片來源:RASPBERRY PI 3 MODEL B+ ON SALE NOW AT $35
2018-03-13:
* Raspberry Pi 3 B+ support
* WiFi is disabled until wireless regulatory domain is set (Pi 3 B+ only)
- The domain can be done through 'Raspberry Pi Configuration' (rc_gui),
'raspi-config' or by setting 'country=' to an appropriate ISO 3166
alpha2 country code in /etc/wpa_supplicant/wpa_supplicant.conf.
* Default wireless regulatory domain is now unset
* Added support to desktop for different screen sizes and resolutions,
including multiple preset options in Appearance Settings and pixel doubling
option in Raspberry Pi Configuration
* Version 2.1.16 of Thonny included
* Version 29.0.0.113 of Adobe PepperFlash player included
* Version 1.2.post1 of Pygame Zero included
* Bluetooth plugin now supports connection to Bluetooth LE HID devices
* Network plugin now indicates 5G-compatible APs
* Latest changes to Bluez ALSA service merged
- service now started on CLI boot as well as GUI boot
* Latest changes to dhcpcd networking plugin merged
* Improved support for running on pi-top devices
* Small design changes to PiX theme and icons
* Bug fix - hide spurious window resize handles
* Bug fix - Scratch 2 remote GPIO state block now works correctly
* Updated WiFi Firmware
- brcmfmac43455-sdio 7.45.154
- brcmfmac43430-sdio 7.45.98.38
* New packages:
- policykit-1
- obconf
- python-buttonshim python3-buttonshim
- python-unicornhathd python3-unicornhathd
- python-pantilthat python3-pantilthat
* Linux kernel 4.9.80+
* Raspberry Pi firmware 3347884c7df574bbabeff6dca63caf686e629699