[Yaffs] Directory execute permission missing

Hi,

I'm trying to port YAFFS2 to RTEMS, using code close to the direct interface.
I'm noticing that the permissions (field obj->yst_mode) of the root and
/lost+found directory objects (haven't tried others yet) lack the execute
permission - the field's value is 40666. Any idea about what might cause this?

Thanks
S.
PS. port URL is https://github.com/lekernel/rtems-yaffs2, this is work in
progress and isn't usable yet.