https://www.intel.in/content/dam/doc/manual/uefi-dev-kit-debugger-tool-manual.pdf
Sec 8.9
Debugging a standalone module
loaded in a UEFI shell using late attach
On Thu, Aug 29, 2013 at 11:13 AM, galla rao <gallagnv....@gmail.com> wrote:
> 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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