Raspberry Pi port, piCore-15.0 is available!
I have the same problem with umount. I have found the cause of the issue: spurious group write permission on /etc/busybox.conf~$ ls -l /etc/busybox.conf-rw--w---- 1 root staff 140 Mar 4 2010 /etc/busybox.conf~$ umount /mnt/sda3umount: can't umount /mnt/sda3: Operation not permitted~$ sudo chmod g-w /etc/busybox.conf~$ ls -l /etc/busybox.conf-rw------- 1 root staff 140 Mar 4 2010 /etc/busybox.conf~$ umount /mnt/sda3~$ I propose to correct this in next version