【每周学习摘要20(24/07/25-24/07/31)】

在新的buildroot(2302)上面交叉编译Mplayer-1.5

./configure --cc=arm-rockchip830-linux-uclibcgnueabihf-gcc --enable-cross-compile --strip=arm-rockchip830-linux-uclibcgnueabihf-strip --target=arm-linux --enable-alsa --enable-fbdev --prefix=/home/ztn/Embedded/RK/luckfox-pico/sysdrv/source/buildroot/buildroot-2023.02.6/output/target/usr --extra-ldflags=-L/home/ztn/Embedded/RK/luckfox-pico/sysdrv/source/buildroot/buildroot-2023.02.6/output/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib --extra-cflags=-I/home/ztn/Embedded/RK/luckfox-pico/sysdrv/source/buildroot/buildroot-2023.02.6/output/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include

然后

make -j && make install

buildroot的output下面的host/sysroot 是包含include和lib的sysroot，全部由交叉编译器生成，所以不用担心和ubuntu-base的一样，生成的binary(例如glibc)源头的编译器和目前使用的编译器不一致.
我觉得有必要学习LFS(Linux from scratch), 这样就能知道glibc或ulibc怎么编译的，包括核心组件比如ls, pwd这些，看8. Chapter 5: Compiling a Cross-Toolchain - How to build Linux From Scratch (LFS) 12.1 Tutorial

conda更新后crash

C:\Users\tz61>conda activate
Traceback (most recent call last):
  File "D:\miniconda3\Lib\site-packages\conda\exception_handler.py", line 18, in __call__
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "D:\miniconda3\Lib\site-packages\conda\cli\main.py", line 96, in main_sourced
    from ..base.context import context
  File "D:\miniconda3\Lib\site-packages\conda\base\context.py", line 31, in <module>
    from ..common._os.linux import linux_get_libc_version
  File "D:\miniconda3\Lib\site-packages\conda\common\_os\__init__.py", line 8, in <module>
    from .windows import get_free_space_on_windows as get_free_space
  File "D:\miniconda3\Lib\site-packages\conda\common\_os\windows.py", line 11, in <module>
    from ctypes import (
  File "D:\miniconda3\Lib\ctypes\__init__.py", line 8, in <module>
    from _ctypes import Union, Structure, Array
ImportError: DLL load failed while importing _ctypes: 找不到指定的模块。

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:\miniconda3\Scripts\conda-script.py", line 12, in <module>
    sys.exit(main())
             ^^^^^^
  File "D:\miniconda3\Lib\site-packages\conda\cli\main.py", line 128, in main
    return conda_exception_handler(main, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\miniconda3\Lib\site-packages\conda\exception_handler.py", line 388, in conda_exception_handler
    return_value = exception_handler(func, *args, **kwargs)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\miniconda3\Lib\site-packages\conda\exception_handler.py", line 21, in __call__
    return self.handle_exception(exc_val, exc_tb)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\miniconda3\Lib\site-packages\conda\exception_handler.py", line 52, in handle_exception
    from .exceptions import (
  File "D:\miniconda3\Lib\site-packages\conda\exceptions.py", line 31, in <module>
    from .models.channel import Channel
  File "D:\miniconda3\Lib\site-packages\conda\models\channel.py", line 23, in <module>
    from ..base.context import Context, context
  File "D:\miniconda3\Lib\site-packages\conda\base\context.py", line 31, in <module>
    from ..common._os.linux import linux_get_libc_version
  File "D:\miniconda3\Lib\site-packages\conda\common\_os\__init__.py", line 8, in <module>
    from .windows import get_free_space_on_windows as get_free_space
  File "D:\miniconda3\Lib\site-packages\conda\common\_os\windows.py", line 11, in <module>
    from ctypes import (
  File "D:\miniconda3\Lib\ctypes\__init__.py", line 8, in <module>
    from _ctypes import Union, Structure, Array
ImportError: DLL load failed while importing _ctypes: 找不到指定的模块。

解决方法
ImportError: DLL load failed while importing _ctypes: Can't find specified module.
我从python3.9的Library/bin下面拷贝了ffi.dll ffi-7.dll到miniconda3下面的Library/Bin就好了，不知道有没有什么别的隐患

Allegro 关于via 和焊盘未连接抑制

1. 检查pad有没有勾选
2. 检查cross-section Editor(Ctrl-2)有没有勾选 Unused pin suppression, unused Via suppression, 还有底下的Dynamic unused pads suppression
3. 检查Hole 到Shape的规则，有可能比Shape到Pad的距离还大(
   

   Rv1106画板心得

   一定要检查这个从PADS转Allegro 或者是从嘉立创封装转AD转Allegro 它的焊盘有没有paste和solder层，以及PADS转过来的pads默认是bb via，然后嘉立创焊盘有时候抽风，阻焊层会很大，注意一下
   Allegro pcb文件大小和设计的画布大小有关系，所以尽量缩小否则文件会上几百兆 source:Allegro brd文件大小优化方向参考

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