[coreboot] Dealing with PCI reset

Paul Menzel paulepanter at users.sourceforge.net
Sun Dec 11 22:48:27 CET 2016

Dear coreboot folks,

Several devices using the Intel 945 chipset copied code for PCI reset,
costing 200 ms of boot time.

        /* Force PCIRST# */
        pci_write_config16(PCI_DEV(0, 0x1e, 0), BCTRL, SBR);
        udelay(200 * 1000);
        pci_write_config16(PCI_DEV(0, 0x1e, 0), BCTRL, 0);

The change-set Ia37d9f0ecf5655531616edb20b53757d5d47b42f [1] removes
that code from the Lenovo X60.

That code was added for some crypto card on a Roda device.

My question is, if removing that code is fine, or if it should be left
in and be made configurable (Kconfig/NVRAM)?

Are there often cases where there are extensions card with problems,
that need such a PCI reset?



[1] https://review.coreboot.org/17703
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