I have an external USB hard drive connected to a netbook with OpenWrt and I can't find anywhere how to eject it or turn it off (that's the idea).
you can simply unmount it, then unplug/turn off.
umount </path/to/drive/>
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there's a luci-app-hd-idle + hd-idle package.
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root@netbook:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
loop0 7:0 0 267.2M 0 loop /overlay
sda 8:0 1 1.9G 0 disk
├─sda1 8:1 1 16M 0 part /boot
│ /boot
└─sda2 8:2 1 300M 0 part /rom
sdb 8:16 0 1.8T 0 disk
└─sdb1 8:17 0 1.8T 0 part /mnt/sdb1
root@netbook:~# umount /dev/sdb
umount: can't unmount /dev/sdb: Invalid argument
I have it installed but I see that it is to schedule the shutdown, not to eject the disk as in any Linux distro.
Try
umount /mnt/sdb1
I don't see the drive turning off (the light is on and it's still spinning).
root@netbook:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
loop0 7:0 0 267.2M 0 loop /overlay
sda 8:0 1 1.9G 0 disk
├─sda1 8:1 1 16M 0 part /boot
│ /boot
└─sda2 8:2 1 300M 0 part /rom
sdb 8:16 0 1.8T 0 disk
└─sdb1 8:17 0 1.8T 0 part /mnt/sdb1
root@netbook:~# umount /mnt/sdb1
root@netbook:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
loop0 7:0 0 267.2M 0 loop /overlay
sda 8:0 1 1.9G 0 disk
├─sda1 8:1 1 16M 0 part /boot
│ /boot
└─sda2 8:2 1 300M 0 part /rom
sdb 8:16 0 1.8T 0 disk
└─sdb1 8:17 0 1.8T 0 part
it cannot shut down the drive... but the unmounting process appears to have worked. From here you can unplug or turn it off manually.
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You can flip USB port power with uhubctl?
root@netbook:~# uhubctl
No compatible devices detected!
Run with -h to get usage info.
Then it is not supportes in that SoC 