BusLogic SCSI AHA-1540B mode BIOS no longer works => fixed in svn

[rak1]

The BusLogic SCSI adapter, when in AHA-1540B mode, no longer boots (or, it seems, allows any disk access via BIOS calls such as use in DOS fdisk) in 7.0.x. This worked in 6.1.44-156814-Win and doesn't work as of 7.0.0-153978-Win.

Steps to reproduce:

1. Configure a machine with BusLogic SCSI storage with at least one hard disk
2. Set the BusLogic SCSI adapter to AHA-1540B mode

$ VBoxManage setextradata 'Your VM Name' VBoxInternal/Devices/buslogic/0/Config/AdapterType AHA-1540B

3. Boot the VM. At the BIOS splash screen press F12 to select boot device.

Expected:

• The detected hard disks list shows the hard disk

Actual:

• No hard disks found

[rak1]

My use case for this is various experimental tinkering in old OSes; if the decision is just that this is not supported going forward, so be it.

[rak1]

With a glance at the codebase, I see there was a very large rewrite of the BIOS SCSI access; whatever enabled BIOS access with the AHA-1540B and BT-545C backwards compatibility modes in the old implementation must have no equivalent anymore.

[rak1]

The Host type here should read "all". Sorry, I had guest type other/other on the brain as I was filling out the form.

[michaln]

Yes, the rewritten SCSI BIOS forgot to take the non-PCI emulated HBAs into account. This is now fixed in svn.