Help me understand the boot up process

Help me understand the boot up process - Printable Version

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+--- Thread: Help me understand the boot up process (/showthread.php?tid=8271)

Help me understand the boot up process - olivercfc - 11-10-2019

I'm obviously missing something fundamental here.

I built an image with buildroot which creates a u-boot-tpl-spl.img, a u-boot.itb file and a root partition

Code:
        image = "u-boot-tpl-spl.img"

        offset = 32768 # 512 * 0x40 from start of sd card

        image = "u-boot.itb"

        offset = 262144 # 512 * 0x200 from start of sd card

        bootable = "yes"

        image = "rootfs.ext2"

In the rootfs partition there's a file called /boot/extlinux.conf which has the following

Code:
label rock64-buildroot

  kernel /boot/Image

  devicetree /boot/rk3328-rock64.dtb

  append console=ttyS2,1500000n8 root=/dev/mmcblk0p1 ro rootwait

This boots up and all is good. However, I'm wondering why I can't just replace /boot/Image and /boot/rk3328-rock64.dtb (and /lib/modules/*) with the one from slack (for example) and have that boot up.

When I tried, it didn't find /boot/Image and tried to boot off the network.

What am I missing here?