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Linux/BEAGLEBK: Errors at boot thru sd card on beaglebone black

Part Number: BEAGLEBK

Tool/software: Linux

HI

I am trying to make sd card for booting.

i am not using pre-built image because i need to change linux source code.

https://www.digikey.com/eewiki/display/linuxonarm/BeagleBone+Black

As described in the site above, I installed u-boot source, kernel source, file system.
and then I compiled u-boot source and kernel source

as instruction, I tried to setup sd card.
I think I'm proceeding to umount normally.

but there are some errors when i insert sd card into sd card holder and power on the beaglebone black
I dont know what is wrong.
could you let me know about errors and how to resolve them?
the errors is as blow



Note that.

compiler :

releases.linaro.org/.../gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf.tar.xz


u-boot

bootloader download path : github.com/.../u-boot
git checkout v2018.09-rc3 -b tmp
uboot patch file : https://rcn-ee.com/repos/git/u-boot-patches/v2018.09-rc3/0001-am335x_evm-uEnv.txt-bootz-n-fixes.patch

kernel

kernel version : 4.14