Flashing emmc... -> mmcblk1 does not exist.

I want to flash bootloader+kernel+root file system to emmc of my custom beaglebone black.

(I saw this manual : https://www.digikey.com/eewiki/display/linuxonarm/BeagleBone+Black)

kernel : 3.8.13-xenomai-r86
root file system : debian 9.8-minimal-armhf

boot sd card is successful. I want to use bbb-eMMC-flasher-eewiki.ext4.sh… but mmcblk1 does not exist. help me.

ps: am33x-rt-v4.14+debian 9.8 armhf → perfect(mmcblk1-> emmc partition is visible.)
3.8.13-xenomai-r86+debian 9.8 armhf → mmcblk1 does not exist(emmc doesn’t overlay)

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