topic how to access i3c controller to read SPD in Sapphire rapids. in Software Tuning, Performance Optimization & Platform Monitoring

topic how to access i3c controller to read SPD in Sapphire rapids. in Software Tuning, Performance Optimization & Platform Monitoring https://community.intel.com/t5/Software-Tuning-Performance/how-to-access-i3c-controller-to-read-SPD-in-Sapphire-rapids/m-p/1722372#M8574 <P>Hi, </P><P> </P><P>I realized that OS can't write I3C registers (MMIO). </P><P>So, I am trying to use mailbox. is it possible? </P><P>if possible, please give me some reference. </P><P> </P><P>Thanks,</P><P>NL_JK</P> Thu, 16 Oct 2025 20:19:57 GMT nl_jk 2025-10-16T20:19:57Z how to access i3c controller to read SPD in Sapphire rapids. https://community.intel.com/t5/Software-Tuning-Performance/how-to-access-i3c-controller-to-read-SPD-in-Sapphire-rapids/m-p/1722372#M8574 <P>Hi, </P><P> </P><P>I realized that OS can't write I3C registers (MMIO). </P><P>So, I am trying to use mailbox. is it possible? </P><P>if possible, please give me some reference. </P><P> </P><P>Thanks,</P><P>NL_JK</P> Thu, 16 Oct 2025 20:19:57 GMT https://community.intel.com/t5/Software-Tuning-Performance/how-to-access-i3c-controller-to-read-SPD-in-Sapphire-rapids/m-p/1722372#M8574 nl_jk 2025-10-16T20:19:57Z