mb/hp/z220_series: Improve the port for z220_sff_workstation
- Move configs for PCIe ports not present on z220_sff_workstation from the devicetree.cb of base board to the overridetree.cb of z220_cmt_workstation. - Add a note for ME/AMT Flash Override jumper, for it is hard to flash from OEM firmware either internally or externally without closing this jumper. - Add a side note for similar HP Compaq Elite 8300 SFF. Signed-off-by: Bill XIE <persmule@hardenedlinux.org> Change-Id: I35d8b97f52a83910a61c12b1f7367ee7a19a9ad7 Reviewed-on: https://review.coreboot.org/c/coreboot/+/65703 Reviewed-by: Arthur Heymans <arthur@aheymans.xyz> Reviewed-by: Paul Menzel <paulepanter@mailbox.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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@@ -44,8 +44,17 @@ The SPI flash can be accessed using [flashrom].
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External programming with an SPI adapter and [flashrom] does work, but it powers the
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whole southbridge complex. You need to supply enough current through the programming adapter.
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If you want to use a SOIC pomona test clip, you have to cut the 2nd DRAM DIMM holder,
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as otherwise there's not enough space near the flash.
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If you want to use a SOIC pomona test clip, you have to cut the 2nd DRAM DIMM holder, as
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otherwise there's not enough space near the flash.
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In both case, if ME has not been completely disabled, ME/AMT Flash Override jumper had better
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be temporary closed for flashing to disable the locking of regions, and prevent ME to run and
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interfere.
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## Side note
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The mainboard of [HP Compaq Elite 8300 SFF] is very similar to the one of Z220 SFF, except
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that Compaq Elite 8300 uses Q77 instead of C216 for its PCH, and their boot firmwares are
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even interchangeable, so should do coreboot images built for them.
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## Technology
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@@ -66,5 +75,6 @@ as otherwise there's not enough space near the flash.
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```
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[HP Z220 SFF Workstation]: https://support.hp.com/za-en/document/c03386950
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[HP Compaq Elite 8300 SFF]: https://support.hp.com/us-en/document/c03345460
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[HP]: https://www.hp.com/
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[flashrom]: https://flashrom.org/Flashrom
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