Is it not possible to introduce *SerialPortWrite* Calls into Bootloaded
code?
Have you tried
i think if you have JTAG debuggers like Arium/ITP/HDT
through WINDBG you should be able to breakthrough
I think if you have Tiano source level debugging macros you should be able
to break into UEFI source
Though i have never worked on bootloaders, that is my vague idea
Any comments from experts?
On Thu, Aug 29, 2013 at 9:57 AM, cruxpot <crux...@gmail.com> wrote:
> Hi,
>
> I am trying to find the best way to debug EFI boot loaders at the
> instruction level. I am trying to write one executed from an EFI shell that
> passes off control to the Windows boot manager in Windows 8 (bootmgfw.efi)
> and I seem to be unable to debug this binary as it passes off control to
> winload.efi.
>
> I have only been able to create a debug entry in Windows 8 to debug
> winload.efi after the virtual memory mapping has already taken place with
> the SetMemoryMap and ExitBootServices calls. I want to be able to debug
> this whole boot process of a UEFI Windows installation started from an EFI
> shell application.
>
> Any insight would be appreciated. I have a Tunnel Mountain UEFI dev kit
> system (with source-level debug ROM) and VMware with an EFI shell to play
> with.
>
> Thanks,
> Nick
>
>
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