Posts made by jack_admin

@顾真牛 在规划部署。

@顾真牛 可以考虑，谢谢

PIN 22 set input

PIN 40 (RK chip gpio115) set output

@xingzhan2012 没配置该服务，另外默认otg端口也是主机host模式。如果走网络adb，起个服务

@edwardzhou
https://www.uubyte.com/rufus-for-mac.html

@xingzhan2012 u盘引导启动系统，备份emmc或tf卡系统到u盘

@allen 内核打开binder IPC

@macthree 建议全新安装会更好，0303版本是纯净版系统，您也可以下载我们github ubuntu仓库构建纯净版本镜像

@macthree 可以的，有纯净版

coolpi 官方出品

@tonyone0902 如果有环境，建议更新到0315 版本loader。

启动刷机方式都是很灵活可选，用户可以根据自身需求扩展。

@cjrcl 这个server版本用户名是ubuntu

@ccjjww1222
参考帖子
https://www.cool-pi.com/topic/131/coolpi-4b-linux-kernel开发在线更新说明/4

@ccjjww1222 V11版本是板载天线。V10是外置天线，你的是哪个版本

@tonyone0902 40Pin 5V位置，限5V

Welcome to OpenEmbedded, the build framework for embedded Linux. OpenEmbedded offers a best-in-class cross-compile environment. It allows developers to create a complete Linux Distribution for embedded systems. Some of the OpenEmbedded advantages include:

• adopted as the build system for the Yocto Project in March 2011.

• support for many hardware architectures

• multiple releases for those architectures

• tools for speeding up the process of recreating the base after changes have been made

• easy to customize

• runs on any Linux distribution

• cross-compiles 1000's of packages including GTK+, Qt, the X Windows system, Mono, Java, and about anything else you might ever need

https://www.openembedded.org/wiki/Main_Page

https://www.openembedded.org/wiki/Commit_Patch_Message_Guidelines

@ccjjww1222 单独编译内核，执行./build-kernel.sh cp4b 编译结束会在内核源码目录生成out目录。

@xingzhan2012
分享下你的操作安装过程（包含使用的镜像文件版本、vnc安装等）

@Macs said in coolpi 4b python3 gpio operation compatable with raspberry pi:

Does the coolpi have a DPI mode for the gpio like the RPI4?

WiringPi ?

@edwardzhou
一种方法是通过改变cpu亲和性，绑定运行中的线程

[coolpi@localhost ~]$ taskset -h
Usage: taskset [options] [mask | cpu-list] [pid|cmd [args...]]


Show or change the CPU affinity of a process.

Options:
 -a, --all-tasks         operate on all the tasks (threads) for a given pid
 -p, --pid               operate on existing given pid
 -c, --cpu-list          display and specify cpus in list format
 -h, --help              display this help
 -V, --version           display version

The default behavior is to run a new command:
    taskset 03 sshd -b 1024
You can retrieve the mask of an existing task:
    taskset -p 700
Or set it:
    taskset -p 03 700
List format uses a comma-separated list instead of a mask:
    taskset -pc 0,3,7-11 700
Ranges in list format can take a stride argument:
    e.g. 0-31:2 is equivalent to mask 0x55555555

For more details see taskset(1).
[coolpi@localhost ~]$

@lymnxn

切换到root权限，参考如下操作，动态关闭4个核

echo 0 > /sys/devices/system/cpu/cpu0/online
echo 0 > /sys/devices/system/cpu/cpu5/online
echo 0 > /sys/devices/system/cpu/cpu6/online
echo 0 > /sys/devices/system/cpu/cpu7/online

@test 你的loader版本看起来比较早，升级loader试下。卡的分区表异常，格式化一次

@lymnxn 应该有方法。另一个思路，把你的应用绑定到大核上

@xingzhan2012 你先试下单独编译内核源码有没有问题，确认依赖环境补齐

@xingzhan2012 你在哪个主机环境编译

@edwardzhou 问题已复现。新建用户在logout之后的t登录界面（输密码窗口）位置，点击屏幕右下角，选择Ubuntu on Xorg，可以正常切换用户，firefox也能运行

@xingzhan2012 论坛上方github linux内核源码可以下载，修改相应名称的dts文件，编译替换

@xingzhan2012

5寸电容触摸屏切换操作参考，使用ubuntu 22.04 20230306版本

coolpi@coolpi:~/Desktop$ cat /boot/firmware/
Image                      cmdline.txt                extlinux/                  modules.tar.gz             rk3588s-cp4.dtb            
System Volume Information/ config.txt                 initrd.img                 rk3588s-cp4-dsi.dtb        vmlinuz                    
coolpi@coolpi:~/Desktop$ cat /boot/firmware/extlinux/extlinux.conf 
default Linux coolpi

label Linux coolpi
	kernel /Image
	initrd /initrd.img
	fdt    /rk3588s-cp4-dsi.dtb
	append root=LABEL=writable rw rootfstype=ext4 console=ttyS0,115200n81 quiet splash plymouth.ignore-serial-consoles vt.global_cursor_default=1 irqchip.gicv3_pseudo_nmi=0 net.ifnames=0
coolpi@coolpi:~/Desktop$

@xingzhan2012 有。在帖子最顶楼