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+Buildroot Pi0
+* [Buildroot \- Making Embedded Linux Easy](https://buildroot.org/download.html)
+download
+```
+$ wget2 https://buildroot.org/downloads/buildroot-2022.02.1.tar.xz \
+> https://buildroot.org/downloads/buildroot-2022.02.1.tar.xz.sign
+$ wget2 https://github.com/pweaver/buildroot/raw/master/buildroot_pubkey.gpg
+$ gpg --import ./buildroot_pubkey.gpg
+gpg: /home/ubuntu/.gnupg/trustdb.gpg: trustdb created
+gpg: key B025BA8B59C36319: public key "Peter Korsgaard <jacmet@uclibc.org>" imported
+gpg: Total number processed: 1
+gpg:               imported: 1
+$ gpg --verify ./buildroot-2022.02.1.tar.xz.sign
+gpg: Signature made Mon 11 Apr 2022 09:51:18 PM UTC
+gpg:                using DSA key AB07D806D2CE741FB886EE50B025BA8B59C36319
+gpg: Good signature from "Peter Korsgaard <jacmet@uclibc.org>" [unknown]
+gpg: WARNING: This key is not certified with a trusted signature!
+gpg:          There is no indication that the signature belongs to the owner.
+Primary key fingerprint: AB07 D806 D2CE 741F B886  EE50 B025 BA8B 59C3 6319
+gpg: WARNING: not a detached signature; file './buildroot-2022.02.1.tar.xz' was NOT verified!
+```
+展開
+```
+$ tar tvf ./buildroot-2022.02.1.tar.xz | lv
+$ tar xf ./buildroot-2022.02.1.tar.xz
+$ cd buildroot-2022.02.1
+```
+```
+$ make list-defconfigs | lv
+$ make list-defconfigs | grep rasp
+  raspberrypi0_defconfig              - Build for raspberrypi0
+  raspberrypi0w_defconfig             - Build for raspberrypi0w
+  raspberrypi2_defconfig              - Build for raspberrypi2
+  raspberrypi3_64_defconfig           - Build for raspberrypi3_64
+  raspberrypi3_defconfig              - Build for raspberrypi3
+  raspberrypi3_qt5we_defconfig        - Build for raspberrypi3_qt5we
+  raspberrypi4_64_defconfig           - Build for raspberrypi4_64
+  raspberrypi4_defconfig              - Build for raspberrypi4
+  raspberrypi_defconfig               - Build for raspberrypi
+  raspberrypicm4io_64_defconfig       - Build for raspberrypicm4io_64
+  raspberrypicm4io_defconfig          - Build for raspberrypicm4io
+  raspberrypizero2w_defconfig         - Build for raspberrypizero2w
+$ make list-defconfigs | grep beagle
+  beagleboardx15_defconfig            - Build for beagleboardx15
+  beaglebone_defconfig                - Build for beaglebone
+  beaglebone_qt5_defconfig            - Build for beaglebone_qt5
+  beagleboneai_defconfig              - Build for beagleboneai
+  beaglev_defconfig                   - Build for beaglev
+$ time make raspberrypi0_defconfig
+$ make menuconfig
+$ time make -j$( nproc )    # Oracle Cloud Free Tier VPS(aarch64 x4/RAM24GB)
+  :
+real    53m12.657s
+user    112m22.482s
+sys     28m29.333s
+$ ls -1s output/images/
+total 150376
+bcm2708-rpi-zero.dtb
+boot.vfat
+rootfs.ext2
+rootfs.ext4
+rpi-firmware
+sdcard.img
+zImage
+$ du -hs output/images/*
+K     output/images/bcm2708-rpi-zero.dtb
+.8M    output/images/boot.vfat
+M     output/images/rootfs.ext2
+       output/images/rootfs.ext4
+.0M    output/images/rpi-firmware
+M     output/images/sdcard.img
+.8M    output/images/zImage
+```
+Intel(R) Core(TM) i5-3320M CPU @ 2.60GHz
+```
+real    439m1.278s
+user    0m1.808s
+sys     0m4.540s
+```
+linux kernel config
+```
+$ make help | grep ^linux: -A5
+linux:
+  linux-menuconfig       - Run linux menuconfig
+  linux-xconfig          - Run linux xconfig
+  linux-gconfig          - Run linux gconfig
+  linux-nconfig          - Run linux nconfig
+$ make linux-menuconfig
+$ make linux-build
+$ make linux-rebuild
+```

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