root@ubuntu-desktop:~/Downloads/SkiffOS# make cmd/bananapi/common/format
make[1]: Entering directory '/home/ubuntu/Downloads/SkiffOS/build'
make[2]: Entering directory '/home/ubuntu/Downloads/SkiffOS/configs/bananapi/common/extensions'
Are you sure? This will completely destroy all data. [y/N] y
Verify that '/dev/sdb' is the correct device. Be sure. [y/N] y
+ set -e
+ echo 'Formatting device...'
Formatting device...
+ parted /dev/sdb mklabel msdos
Warning: The existing disk label on /dev/sdb will be destroyed and all data on
this disk will be lost. Do you want to continue?
Yes/No? Yes                                                               
Information: You may need to update /etc/fstab.

+ echo 'Making boot partition...'                                         
Making boot partition...
+ parted -a optimal /dev/sdb mkpart primary fat32 2MiB 310MiB
Information: You may need to update /etc/fstab.

+ parted /dev/sdb set 1 boot on                                           
Information: You may need to update /etc/fstab.

+ parted /dev/sdb set 1 lba on                                            
Information: You may need to update /etc/fstab.

+ PI_SD_Subuntu=/dev/sdb                                                      
+ '[' -b /dev/sdbp1 ']'
+ mkfs.vfat -F 32 /dev/sdb1
mkfs.fat 4.1 (2017-01-24)
mkfs.vfat: unable to open /dev/sdb1: No such file or directory
Makefile:2: recipe for target 'format' failed
make[2]: *** [format] Error 1
make[2]: Leaving directory '/home/ubuntu/Downloads/SkiffOS/configs/bananapi/common/extensions'
Makefile:10: recipe for target 'cmd/bananapi/common/format' failed
make[1]: *** [cmd/bananapi/common/format] Error 2
make[1]: Leaving directory '/home/ubuntu/Downloads/SkiffOS/build'
Makefile:2: recipe for target 'cmd/bananapi/common/format' failed
make: *** [cmd/bananapi/common/format] Error 2