Which intel tech document for IOC and SOC communication in boot up?

[yhou1]

hi,

We worked on MRB intel reference board, which has Apollo lake SOC mounted, and another IOC module.

We understand during boot up phase, IOC will send some commands to the bootloader, which is running in SOC side, in order to boot the system(e.g.: linux).

Can you help me to know which intel tech document (document number?) is preferred to be referred in order to understand how IOC to control SOC boot up via some commands?

Thanks.

[CarlosAM_INTEL]

Hello, yong_hou:

Thank you for contacting Intel Embedded Community.

Based on your previous communication, could you please clarify if the IOC module has been manufactured by you or by a third-party company? In case that it is a third-party device, could you please give us the part number, model, and where to find its documentation?

Thanks in advance for your cooperation.

Best regards,

Carlos_A.

[yhou1]

Carlos_A

Thanks for the feedback,

We are supporting a third party company for a concept project. And the idea is in this project Spanision-MB91F526L,which is in MRB design, will be replaced with RH850.

Due to this change based on MRB design, we have to develop our IOC-RH850 SW and do the communication with SOC-ABL in order to boot SOC SW.

However we do not understand what`s the commands from IOC to SOC-bootloader in order to boot the whole system on SOC. We expect some Intel tech docs for the reference.

Thanks for the support.

[CarlosAM_INTEL]

Hello, yong_hou :

Thanks for your reply.

The information that may help you is stated in the following documents:

https://www.intel.com/content/dam/www/public/us/en/documents/white-papers/minimal-intel-architecture-boot-loader-paper.pdf https://www.intel.com/content/dam/www/public/us/en/documents/white-papers/minimal-intel-architecture-boot-loader-paper.p…

https://www.intel.com/content/dam/www/public/us/en/documents/articles/boot-loader-choices-small-fast-requirements-article.pdf https://www.intel.com/content/dam/www/public/us/en/documents/articles/boot-loader-choices-small-fast-requirements-articl…

We hope that it is useful.

Best regards,

Carlos_A.