Can't boot from ada1s2a with boot0, getting only # sign

[Mario Zorin]

Hi all,

I have a disk partitioned like this:

# ls /dev/ada1*
/dev/ada1    /dev/ada1s2  /dev/ada1s2b /dev/ada1s2e
/dev/ada1s1  /dev/ada1s2a /dev/ada1s2d /dev/ada1s2f

# gpart show
=>       63  976773105  ada1  MBR  (466G)
         63         63        - free -  (32K)
        126   79691661     1  freebsd  (38G)
   79691787         63        - free -  (32K)
   79691850  897081255     2  freebsd  [active]  (428G)
  976773105         63        - free -  (32K)

=>       0  79691661  ada1s1  BSD  (38G)
         0  79691661          - free -  (38G)

=>        0  897081255  ada1s2  BSD  (428G)
          0          6          - free -  (3.0K)
          6    6291456       1  freebsd-ufs  (3.0G)
    6291462    8388608       2  freebsd-swap  (4.0G)
   14680070    4194304       4  freebsd-ufs  (2.0G)
   18874374   79691776       5  freebsd-ufs  (38G)
   98566150  798515104       6  freebsd-ufs  (381G)
  897081254          1          - free -  (512B)

(I'll fill the s1 slice with an older version of windows in the future,
hence MBR.) During install of 11-CURRENT system (the same happened with
10-STABLE) I set desired partitions like this:

ada1        466 GB MBR
  ada1s1     38 GB BSD
  ada1s2    428 GB BSD
    ada1s2a 3.0 GB freebsd-ufs   /
    ada1s2b 4.0 GB freebsd-swap
    ada1s2d 2.0 GB freebsd-ufs   /var
    ada1s2e  38 GB freebsd-ufs   /usr
    ada1s2f 381 GB freebsd-ufs   /home

After install, I did

boot0cfg -B ada1

After boot, I got the expected menu:

F1 FreeBSD
F2 FreeBSD
...

However, after pressing F2, I got only # sign printed. Repeated pressing F2
resulted just in new # added behind in the same line.

I can't figure out what else I have to do. What am I missing?

M.Zorin