Trouble Floppy Booting an MVME167
I am not very familiar with MVME, but thought I'd try to get Debian to run on a 167.
My first step was to boot up from floppy, but I'm unable to reach the LILO prompt.
Here is what I have done.
1) removed other target boards (162s) from the bus
2) reconfigured SCSI bus so that TEAC floppy drive is ID 0
3) jumpered the 167 for SRAM and checked that the starting memory is zero-filled (MD 0:40:L)
4) entered either AB or BO at the bug or diag prompt.
When I enter BH (boot halt) at the bug prompt and then trace, I see some code that contains a "SYSCALL .DSKRD". Following this floppy disk access is a branch statement that probably leads to a successful boot. The trace fails to take this branch and loops back and repeats (including the "SYSCALL .DSKRD"). On a third loop, before the "SYSCALL .DSKRD", it branches to $10000 where memory is zero-filled.
I have tried different floppy diskettes, and both the potato and woody rescue.bin images created using rawrite2.
All results appear the same. Does anyone have any helpful suggestions?
I have noted the D4 register is 49504C2C, but Motorola BO documentation indicates it should be 49504C0C.
The documentaion states the 0C at the end indicates "TRAP #15 support with stack parameter passing TRAP #15 disk support".
I don't know whether this is significant, but thought I'd mention it. Perhaps the bit set by the 2 is not relevant.