修改文件变化通知机制Inotify的限制

作者：付汉杰 hankf@xilinx.com hankf@amd.com 测试环境： Vivado/PetaLinux 2021.2， Linux 5.10.0

如何修改u-boot的boot.scr

修改修改components/yocto/layers/meta-xilinx/meta-xilinx-bsp/recipes-bsp/u-boot/u-boot-zynq-scr/ boot.cmd.generic，可以修改u-boot的boot.scr。

如何查找Linux kernel编译日志

按下列步骤，查找Linux kernel编译日志存储

进入petalinux工程的“build/tmp”子目录

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[hankf@localhost tmp]$ pwd
/home/hankf/proj/vck190/vck190-0316-peta/build/tmp

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[hankf@localhost tmp]$ find -name "kernel-source" 
./work-shared/versal-generic/kernel-source

进入目录 kernel-source，并查看文件

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[hankf@localhost tmp]$ cd work-shared/versal-generic/kernel-source/
[hankf@localhost kernel-source]$ ls 
arch   COPYING  Documentation  include  Kbuild     mm       oe-workdir  scripts   tools
block  CREDITS  drivers        init     Kconfig  lib                                             MAINTAINERS                         net      README      security  usr
certs  crypto   fs             ipc      kernel   LICENSES                                        Makefile                             oe-logs  samples     sound     virt

进入目录“oe-logs”查找“log.do_compile_kernel*”文件

查看最近修改文件，或者log.do_compile_kernel* 文件。最新的log.do_compile_kernel*文件，就是kernel的gcc编译日志。

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[hankf@localhost kernel-source]$ cd oe-logs/
[hankf@localhost oe-logs]$ ls -alrt | tail -n 10
-rw-rw-r--.  1 hankf hankf  26082 Mar 17 04:00 run.extend_recipe_sysroot.18319
-rw-rw-r--.  1 hankf hankf   5488 Mar 17 04:00 log.task_order
lrwxrwxrwx.  1 hankf hankf     34 Mar 17 04:00 log.do_compile_kernelmodules -> log.do_compile_kernelmodules.18330
lrwxrwxrwx.  1 hankf hankf     30 Mar 17 04:00 run.do_assemble_fitimage -> run.do_assemble_fitimage.18319
lrwxrwxrwx.  1 hankf hankf     34 Mar 17 04:00 run.do_compile_kernelmodules -> run.do_compile_kernelmodules.18330
-rwxrwxr-x.  1 hankf hankf  23283 Mar 17 04:00 run.do_compile_kernelmodules.18330
-rwxrwxr-x.  1 hankf hankf  24552 Mar 17 04:00 run.do_assemble_fitimage.18319
-rw-rw-r--.  1 hankf hankf   3950 Mar 17 04:00 log.do_assemble_fitimage.18319
-rw-rw-r--.  1 hankf hankf  17835 Mar 17 04:00 log.do_compile_kernelmodules.18330
drwxrwxr-x.  2 hankf hankf  36864 Mar 17 04:00 .

[hankf@localhost oe-logs]$ ls log.do_compile_kernel*
log.do_compile_kernelmodules        log.do_compile_kernelmodules.11901  log.do_compile_kernelmodules.19287  log.do_compile_kernelmodules.24979
log.do_compile_kernelmodules.11390  log.do_compile_kernelmodules.18330  log.do_compile_kernelmodules.19623
[1]   Done                    gedit log.do_compile_kernelmodules.18330

[hankf@localhost oe-logs]$ gedit log.do_compile_kernelmodules.18330  &
[1] 20997

CentOS 7.9 下如何使用PetaLinux 2021.2

在CentOS 7.9 下使用PetaLinux 2021.2编译工程，会得到告警“Seems like your machine does not have gcc 6 or greater version”，并且不能编译。

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[root@localhost vck190-0316-peta]# lsb_release -a
LSB Version:    :core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch
Distributor ID: CentOS
Description:    CentOS Linux release 7.9.2009 (Core)
Release:        7.9.2009
Codename:       Core

[root@localhost vck190-0316-peta]# gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.5/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c  ,objc,obj-c  ,java,fortran,ada,go,lto --enable-plugin --enable-initfini-array --disable-libgcj --with-isl=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/isl-install --with-cloog=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/cloog-install --enable-gnu-indirect-function --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux
Thread model: posix
gcc version 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC)

[hankf@localhost vck190-0316-peta]$ petalinux-build 
[INFO] Sourcing buildtools
[INFO] Building project
WARNING: Seems like your machine does not have gcc 6 or greater version,
Please enable buildtools Extended in petalinux-config --> yocto settings
[INFO] Extracting yocto SDK to components/yocto. This may take time!
ERROR: Failed to Extract Yocto SDK.
ERROR: Failed to build project. Check the /home/hankf/proj/vck190/dapd-0305-colour-peta/build/build.log file for more details...

CentOS 7.9自带的GCC是4.8.5，太旧了。PetaLinux要求gcc 6或者更高版本。通过工具SCL，是可以在同一个系统上编译，安装，并且使用多个版本的软件。使用下列命令，为CentOS 7.9安装GCC 7.

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sudo yum install centos-release-scl

sudo yum install devtoolset-7

然后通过下列命令启动一个新的 shell，就可以使用GCC 7

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scl enable devtoolset-7 bash

gcc --version
gcc (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5)
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

注意，不能把“scl enable devtoolset-7 bash”加入".bashrc"，它会导致命令行出现以下错误。

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bash: fork: retry: No child processes
bash: fork: retry: No child processes
bash: fork: Resource temporarily unavailable

glibc git: No such file or directory

使用template新建的PetaLinux工程，编译遇到错误“glibc/2.32-r0/git: No such file or directory”。更多信息如下。再次执行petalinux-build，能正常编译通过。

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NOTE: Running ../../../../../../../../../../../home/hankf/proj/vck190/vck190-0316-peta/build/tmp/work/cortexa72-cortexa53-xilinx-linux/glibc/2.32-r0/git/configure  --build=x86_64-linux 		  --host=aarch64-xilinx-linux 		  --target=aarch64-xilinx-linux 		  --prefix=/usr 		  --exec_prefix=/usr 		  --bindir=/usr/bin 		  --sbindir=/usr/sbin 		  --libexecdir=/usr/libexec 		  --datadir=/usr/share 		  --sysconfdir=/etc 		  --sharedstatedir=/com 		  --localstatedir=/var 		  --libdir=/usr/lib 		  --includedir=/usr/include 		  --oldincludedir=/usr/include 		  --infodir=/usr/share/info 		  --mandir=/usr/share/man 		  --disable-silent-rules 		  --disable-dependency-tracking 		  --with-libtool-sysroot=/home/hankf/proj/vck190/vck190-0316-peta/build/tmp/work/cortexa72-cortexa53-xilinx-linux/glibc/2.32-r0/recipe-sysroot --enable-kernel=3.14                 --disable-profile                 --disable-debug --without-gd                 --enable-clocale=gnu                 --with-headers=/home/hankf/proj/vck190/vck190-0316-peta/build/tmp/work/cortexa72-cortexa53-xilinx-linux/glibc/2.32-r0/recipe-sysroot/usr/include                 --without-selinux                 --enable-tunables                 --enable-bind-now                 --enable-stack-protector=strong                 --enable-stackguard-randomization                 --disable-crypt                 --with-default-link                                                     --disable-static  --enable-nscd 

../../../../../../../../../../../home/hankf/proj/vck190/vck190-0316-peta/build/tmp/work/cortexa72-cortexa53-xilinx-linux/glibc/2.32-r0/git/configure: line 1323: cd: ../../../../../../../../../../../home/hankf/proj/vck190/vck190-0316-peta/build/tmp/work/cortexa72-cortexa53-xilinx-linux/glibc/2.32-r0/git: No such file or directory


configure: error: sources are in ../../../../../../../../../../../home/hankf/proj/vck190/vck190-0316-peta/build/tmp/work/cortexa72-cortexa53-xilinx-linux/glibc/2.32-r0/git, but `cd ../../../../../../../../../../../home/hankf/proj/vck190/vck190-0316-peta/build/tmp/work/cortexa72-cortexa53-xilinx-linux/glibc/2.32-r0/git' does not work
checking build system type... x86_64-pc-linux-gnu
checking host system type... aarch64-xilinx-linux-gnu
checking for aarch64-xilinx-linux-gcc... aarch64-xilinx-linux-gcc  -mcpu=cortex-a72.cortex-a53 -march=armv8-a crc  --sysroot=/home/hankf/proj/vck190/vck190-0316-peta/build/tmp/work/cortexa72-cortexa53-xilinx-linux/glibc/2.32-r0/recipe-sysroot
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether aarch64-xilinx-linux-gcc  -mcpu=cortex-a72.cortex-a53 -march=armv8-a crc  --sysroot=/home/hankf/proj/vck190/vck190-0316-peta/build/tmp/work/cortexa72-cortexa53-xilinx-linux/glibc/2.32-r0/recipe-sysroot accepts -g... yes
checking for gcc... gcc 
checking for aarch64-xilinx-linux-readelf... aarch64-xilinx-linux-readelf
checking whether we are using the GNU C   compiler... yes
checking whether aarch64-xilinx-linux-g    -mcpu=cortex-a72.cortex-a53 -march=armv8-a crc  --sysroot=/home/hankf/proj/vck190/vck190-0316-peta/build/tmp/work/cortexa72-cortexa53-xilinx-linux/glibc/2.32-r0/recipe-sysroot accepts -g... yes
checking whether aarch64-xilinx-linux-g    -mcpu=cortex-a72.cortex-a53 -march=armv8-a crc  --sysroot=/home/hankf/proj/vck190/vck190-0316-peta/build/tmp/work/cortexa72-cortexa53-xilinx-linux/glibc/2.32-r0/recipe-sysroot can link programs... no
../../../../../../../../../../../home/hankf/proj/vck190/vck190-0316-peta/build/tmp/work/cortexa72-cortexa53-xilinx-linux/glibc/2.32-r0/git/configure: line 3253: cd: ../../../../../../../../../../../home/hankf/proj/vck190/vck190-0316-peta/build/tmp/work/cortexa72-cortexa53-xilinx-linux/glibc/2.32-r0/git: No such file or directory
configure: error: you must configure in a separate build directory