[edk2-devel] Execution of TempRamInitApi doesn't return.

[edk2-devel] Execution of TempRamInitApi doesn't return.

[memristor2 via groups.io]

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Hello everyone,
I am trying to build an Intel platform's customized UEFI.
I have extracted the microcode and FSP binaries from the vendors UEFI image successfully. I also changed the PlatformPkg and FspFlashOffset FDF files. Execution goes on fine up until the last line of this subroutine:

FspHeaderFound:
; Get the fsp TempRamInit Api address
mov eax, dword [edi + FSP_HEADER_IMAGEBASE_OFFSET]
add eax, dword [edi + FSP_HEADER_TEMPRAMINIT_OFFSET]
; Setup the hardcode stack
mov esp, TempRamInitStack
; Call the fsp TempRamInit Api jmp eax

I have checked the address of TempRamInit Entry which matched the address inside the FSP header.
but somehow it doesn't return to the TempRamInitDone subroutine. I have no idea why this happens. I also changed the UPD parameters to match the signature of the target platform.
Any thoughts on this?

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Re: [edk2-devel] Execution of TempRamInitApi doesn't return.

[memristor2 via groups.io]

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Any thoughts on this?
even the smallest hints would be highly appreciated.

Sent with [Proton Mail](https://proton.me/mail/home) secure email.

On Tuesday, December 24th, 2024 at 6:12 PM, memristor2 via groups.io <memristor2=proton.me@groups.io> wrote:

> Hello everyone,
> I am trying to build an Intel platform's customized UEFI.
> I have extracted the microcode and FSP binaries from the vendors UEFI image successfully. I also changed the PlatformPkg and FspFlashOffset FDF files. Execution goes on fine up until the last line of this subroutine:
>
> FspHeaderFound:
> ; Get the fsp TempRamInit Api address
> mov eax, dword [edi + FSP_HEADER_IMAGEBASE_OFFSET]
> add eax, dword [edi + FSP_HEADER_TEMPRAMINIT_OFFSET]
> ; Setup the hardcode stack
> mov esp, TempRamInitStack
> ; Call the fsp TempRamInit Api jmp eax
>
> I have checked the address of TempRamInit Entry which matched the address inside the FSP header.
> but somehow it doesn't return to the TempRamInitDone subroutine. I have no idea why this happens. I also changed the UPD parameters to match the signature of the target platform.
> Any thoughts on this?
>
> 

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Re: [edk2-devel] Execution of TempRamInitApi doesn't return.

[memristor2 via groups.io]

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So I figured this out and it was a microcode issue. I extracted another set of microcode mcbs for the target platform and added them to the FV, execution returned from TempInitRamApi. I was stuck on this since I didn't have any access to the FSP-T source code and there was no other debugging approaches in this phase. I suspected the issue would be caused by one of the following:

- Fsp-T parameter's pointer being passed to the TempRamInitApi
- the temporary RAM base wasn't correct
- there would be a problem in the microcode I was using,

since there wouldn't be any reason for the execution to not return if no.1 and 2 were the issues my suspicions made me focus on No. 3 since a buggy microcode would highly likely crash the processor. I must mention the first set of microcode mcbs used were meant for this platform but somehow they didn't work right. Turns out I guessed it right.

On Monday, December 30th, 2024 at 5:11 PM, memristor2 via groups.io <memristor2=proton.me@groups.io> wrote:

> Any thoughts on this?
> even the smallest hints would be highly appreciated.
>
> Sent with [Proton Mail](https://proton.me/mail/home) secure email.
>
> On Tuesday, December 24th, 2024 at 6:12 PM, memristor2 via groups.io <memristor2=proton.me@groups.io> wrote:
>
>> Hello everyone,
>> I am trying to build an Intel platform's customized UEFI.
>> I have extracted the microcode and FSP binaries from the vendors UEFI image successfully. I also changed the PlatformPkg and FspFlashOffset FDF files. Execution goes on fine up until the last line of this subroutine:
>>
>> FspHeaderFound:
>> ; Get the fsp TempRamInit Api address
>> mov eax, dword [edi + FSP_HEADER_IMAGEBASE_OFFSET]
>> add eax, dword [edi + FSP_HEADER_TEMPRAMINIT_OFFSET]
>> ; Setup the hardcode stack
>> mov esp, TempRamInitStack
>> ; Call the fsp TempRamInit Api jmp eax
>>
>> I have checked the address of TempRamInit Entry which matched the address inside the FSP header.
>> but somehow it doesn't return to the TempRamInitDone subroutine. I have no idea why this happens. I also changed the UPD parameters to match the signature of the target platform.
>> Any thoughts on this?
>
> 

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