[Oberon] Error in access to CF or to filesystem after installing A2.

[eas lab]

1] I've installed A2 to a CF card using an A2.iso built using
LinuxAos.        =Attempt to write file/s to CF

       2]Attempting to boot via BootManager gives a black screen.
              BootManager DOES respond to file/s of 1]
3]Attempting to mount the CF part from a working Native Oberon gives,
       3] "CF: OFSAosFiles: Bad volume size".
              Is it known that/if N-O would read such a CF.

4] Attempting to boot via GRUB gives
       4] "error: hd2 cannot get C/H/S values".
Does the CF simulate an IDE?
AFAIR N-O:Partition.* is good, down to low-level.
And even GRUB reports failure at the lowest level.

] About a month back, a similar installation gave an A2 on a CF which
       ] booted up with no problem.  Does anyone recognize the failure
here?
] What might I work on to solve it?

Know the sequence of steps that must each succeed, and confirm to diagnose:
[without much deep thought]
CPU resets programCounter to ROM, which does:
C/H/S detected by <BIOS like>,
M$-standard mandates loading and running the MBR-code, per C/H/S above.
 ---------
 "Can't detect C/H/S" is DEADest condition.

 == Chris Glur.