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SK-AM62B: On AM62B, how to use the Yocto build for Tiny Linux?

Rio Chan
Genius 14625 points
Part Number: SK-AM62B

Champs:

There is a customer request to know: how to use the Yocto building the "TinyLinux" or rootfs under 512M.

Do we know how to shrink the size < 512M RootFS by using Yocto?

please comment, thanks.

BR Rio

  • 0
    TI__Guru 69562 points

    Hi Rio,

    when you build the tisdk-tiny-image for AM62x based on SDK v9.0 sources...

    $ MACHINE=am62xx-evm bitbake -k tisdk-tiny-image

    ...the resulting uncompressed rootfs size is about 93MB, see the first file .rootfs.cpio.

    $ ll -h arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm*
-rw-r--r-- 2 a0797059 a0797059  93M Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.cpio
-rw-r--r-- 2 a0797059 a0797059  25M Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.cpio.xz
-rw-r--r-- 2 a0797059 a0797059 3.9K Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.manifest
-rw-r--r-- 2 a0797059 a0797059  25M Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.tar.xz
-rw-r--r-- 2 a0797059 a0797059   91 Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.tar.xz.md5sum
-rw-r--r-- 2 a0797059 a0797059 3.5K Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.wic.bmap
-rw-r--r-- 2 a0797059 a0797059  33M Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.wic.xz
-rw-r--r-- 2 a0797059 a0797059 451K Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm-20230920222657.testdata.json
lrwxrwxrwx 2 a0797059 a0797059   54 Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm.cpio -> tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.cpio
lrwxrwxrwx 2 a0797059 a0797059   57 Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm.cpio.xz -> tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.cpio.xz
lrwxrwxrwx 2 a0797059 a0797059   58 Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm.manifest -> tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.manifest
lrwxrwxrwx 2 a0797059 a0797059   56 Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm.tar.xz -> tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.tar.xz
lrwxrwxrwx 2 a0797059 a0797059   63 Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm.tar.xz.md5sum -> tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.tar.xz.md5sum
lrwxrwxrwx 2 a0797059 a0797059   56 Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm.testdata.json -> tisdk-tiny-image-am62xx-evm-20230920222657.testdata.json
lrwxrwxrwx 2 a0797059 a0797059   58 Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm.wic.bmap -> tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.wic.bmap
lrwxrwxrwx 2 a0797059 a0797059   56 Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm.wic.xz -> tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.wic.xz

    Similarly, when I extract the .wic.xz SD card image file, the resulting image is 298MB in size (which has a lot of space I'm sure could be trimmed out depending on application needs). Also here, less than 512MB.

    $ unxz -k arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.wic.xz

$ ll -h arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.wic*
-rw-r--r-- 1 a0797059 a0797059 298M Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.wic
-rw-r--r-- 2 a0797059 a0797059 3.5K Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.wic.bmap
-rw-r--r-- 2 a0797059 a0797059  33M Sep 20 17:28 arago-tmp-default-glibc/deploy/images/am62xx-evm/tisdk-tiny-image-am62xx-evm-20230920222657.rootfs.wic.xz

    Which SDK version/file are you looking at?

    I think there was an issue in an earlier SDK with the tisdk-tiny-image was very large due to some software bug/issue but I'm not sure if this was ever made public like that. Either way, SDK v9.0 should work as shown above.

    Regards, Andreas

  • 0 in reply to Andreas Dannenberg
    TI__Genius 14625 points

    Hi Andreas:

    Thanks for providing this, plz wait our discussion here.

    BR Rio