Can’t connect when use bootdebug option

[Anonymous]

I’m using VMWare 7.1.4 + VirtualKD 2.5.4. Guest OS is Windows 7 Pro SP1

I’m current work on a HBA driver, and I need debug from bootloader.
So, I do such as thing:
bcdedit /bootdebug {bootmgr} on

The VirtualKD was work perfect, but after use bootdebug option, WinDBG can’t connect to guest OS.
Then I try to use pipe com port, it’s connected!

I guess that is bootloader try to access hardware directly, not via kdext module?

Is there is any way to solve this problem? or I must debug via pipe com_1 ?

[support]

Not 100% sure, but I think I’ve stumbled upon some article from Microsoft explaining that the loader debugging is only possible using COM1. I would suggest googling around to see if anyone managed to set up other protocol for the bootloader (e.g. FireWire).

[Author]

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