Hi all,<br />I'm working on root-causing an issue where I'm unable to retrieve any debug logs after cache-as-RAM teardown on my MinPlatform board port for GSoC 2021. I'm using KabylakeOpenBoardPkg/PeiSerialPortLibSpiFlash.<br /><br />My best guess at the moment is that it's related to HOBs, which this SerialPortLib uses. If I reinitialise the library stack, it largely works, but a HOB/context structure entry "CurrentWriteOffset" also looks like it's zeroed.<br /><br />Also, GetFeatureImplemented() in MinPlatformPkg/Test/TestPointCheckLib/PeiTestPointCheckLib.c asserts with "Status = Not Found". Internally, the test point architecture uses HOBs. I don't think this should happen, so, if not for this, I would think that perhaps a pointer in the serial port library needed to be updated.<br /><br />I can see that the heap is copied over to permanent memory by the PEI core dispatcher (<a href="https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c#L881" target="_blank" rel="noopener">https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c#L881</a>). However, I can't see that the HOB list pointer is updated, so it looks like it (<a href="https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Core/Pei/Hob/Hob.c#L44" target="_blank" rel="noopener">https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Core/Pei/Hob/Hob.c#L44</a>) still has the value that's copied over from the old PEI core's data (<a href="https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c#L348" target="_blank" rel="noopener">https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c#L348</a>).<br /><br />Does this look like a bug, or might there be something else that I'm missing?<br /><br />Best regards,<br />Benjamin