Locating IFWI_IN BIOS image for SlimBootloader to load on our Customer Reference Board

[SPGarrison]

Hello,

We are currently trying to build a custom UEFI image using SlimBootloader for the Intel Alder Lake-N Customer Reference Board. Can you please point us to where we can download the IFWI_IN BIOS firmware image to stitch the SlimBootloader output package into, as mentioned in 2) on https://slimbootloader.github.io/supported-hardware/adl-rvp.html#stitching, or provide instructions on how to generate this ourselves?

Thank you for your help

[CarlosAM_INTEL]

Hello, @SPGarrison 

Thank you for contacting Intel Embedded Community.

We received your request but we need to address the following questions to understand this forum:

Who provides you with the Customer Reference Board (CRB) related to this forum?

Could you please attach to this forum pictures of the top side markings of the CRB?

We are waiting for your reply.

Best regards,

@CarlosAM_INTEL. 

[SPGarrison]

Hi @CarlosAM_INTEL ,

Thank you for your swift reply.

Our CRB was provided by AAEON, and our Intel SoCs are provided by our Intel distrubutor in Europe.

Please see attached a photo of the top marking. My colleague @Omar34 who also recently posted in the forum here is referencing the same board.

Kind regards,

@SPGarrison 

[hrushiraj]

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Subject: Request for Base IFWI_IN Firmware Image for Alder Lake-N CRB Slim Bootloader Stitching

Hello @CarlosAM_INTEL 

We are currently developing a custom UEFI firmware for the Intel Alder Lake-N Customer Reference Board using Slim Bootloader. As part of the stitching workflow (referenced at https://slimbootloader.github.io/supported-hardware/adl-rvp.html#stitching), we require the IFWI_IN reference BIOS image that serves as the base for generating the final <SBL_IFWI_IMAGE_NAME>.

python Platform/AlderlakeBoardPkg/Script/StitchLoader.py -i <BIOS_IMAGE_NAME> -s Outputs/<plat>/SlimBootloader.bin -o <SBL_IFWI_IMAGE_NAME>

I'm talking about the BIOS_IMAGE_NAME here. I saw the solution you gave but that didn't solve my problem, the guide just has booting instructions. I have the Developer Zone Premier access. 
Could you please direct us to the appropriate download location for the Alder Lake-N CRB IFWI/BIOS image, or provide instructions on how this IFWI file can be created?

Thank you

[Diego_INTEL]

Hello @hrushiraj,

Thank you for contacting Intel Embedded Community.

You can check document #862406 - Intel Atom® x7000 Processor Series, Intel® Processor N-Series, & Intel® Core™ i3-N305 Processor for Network & Edge (ASL and ADL-N IPU 2025.4) Firmware Best Known Configuration (BKC), in RDC.

Best regards,

@Diego_INTEL

[SPGarrison]

Hi @CarlosAM_INTEL ,

Just to add some more information, I have used a DediProg SF600Plus-G2 to read the the contents of the BIOS flash on the CRB, saved it to a file called "intel-bios-flash.bin", but this was rejected as an IFWI_IN image as well with the error "BIOS image is too big to fit into BIOS region!"

How can I stitch my read-back BIOS with my SlimBootloader source code?

Thanks,

@SPGarrison 

[CarlosAM_INTEL]

Hello, @SPGarrison:

Thanks for your reply.

The information provided to your colleague mentioned in one of your previous communications may help you.

Due to this fact, please contact them to request our suggestion.

Best regards,

@CarlosAM_INTEL.