@Gaggery any new results?

It stuck at bootblock_pch_early_init -> gspi_early_bar_init -> gspi_get_cfg -> config_of_soc -> config_of -> pcidev_on_root -> pcidev_path_on_root -> pci_path_behind -> find_dev_path -> path_eq. It's an interesting location where it was stuck. Need some more time to debug. Welcome for suggestion. I tried to disable PBE timer by directly writing 0x1 to MSR 0x139 but it was hung at wrmsr.

gspi_early_bar_init is not called from bootblock_pch_early_init but from bootblock_soc_init, while bootblock_pch_early_init is called from bootblock_soc_early_init.

I assume you are looking at skylake/ while Gaggery tested on a newer platform.

In both cases that'd mean that CAR is not reached

I don't follow, you are both referring to C functions. Those run after
CAR setup.

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