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@@ -116,6 +116,10 @@ The boards in this section are not real mainboards, but emulators.
- [MS-7707](msi/ms7707/ms7707.md)
+## OCP
+
+- [Tioga Pass](ocp/tiogapass.md)
+
## Open Cellular
- [Elgon](opencellular/elgon.md)
diff --git a/Documentation/mainboard/ocp/tiogapass.md b/Documentation/mainboard/ocp/tiogapass.md
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+# OCP Tioga Pass
+
+This page describes coreboot support status for the [OCP] (Open Compute Project)
+Tioga Pass server platform.
+
+## Introduction
+
+OCP Tioga Pass server platform was contributed by Facebook, and was accepted
+in 2019. The design collateral including datasheet can be found at [OCP Tioga Pass].
+
+Since complete EE design collateral is open sourced, anyone can build server
+as-is or a variant based on the original design. It can also be purchased from [OCP Market Place].
+An off-the-shelf version is available, as well as rack ready version. With the
+off-the-shelf version, the server can be plugged into wall power outlet.
+
+With the off-the-shelf version of Tioga Pass, a complete software solution is
+available. [Off-the-shelf Host Firmware] takes the approach of UEFI/Linuxboot.
+
+coreboot as of release 4.13 is a proof-of-concept project between Facebook,
+Intel, Wiwynn and Quanta. The context is described at [OCP Tioga Pass POC Blog].
+
+## Required blobs
+
+This board currently requires:
+- FSP blob: The blob (Intel Skylake Scalable Processor Firmware Support Package)
+ is not yet available to the public. The binary is at POC status, hopefully
+ someday an IBV is able to obtain the privilege to maintain it.
+- Microcode: `3rdparty/intel-microcode/intel-ucode/06-55-04`
+- ME binary: The binary can be extracted from [Off-the-shelf Host Firmware].
+
+## Payload
+- Linuxboot: This is necessary only if you use Linuxboot as coreboot payload.
+ U-root as initramfs, is used in the POC activity. It can be extracted from
+ [Off-the-shelf Host Firmware], or it can be built following [All about u-root].
+
+## Flashing coreboot
+
+To do in-band FW image update, use [flashrom]:
+ flashrom -p internal:ich_spi_mode=hwseq -c "Opaque flash chip" --ifd \
+ -i bios --noverify-all -w <path to coreboot image>
+
+From OpenBMC, to update FW image:
+ fw-util mb --force --update <path to coreboot image>
+
+To power off/on the host:
+ power-util mb off
+ power-util mb on
+
+To connect to console through SOL (Serial Over Lan):
+ sol-util mb
+
+## Known issues / feature gaps
+- C6 state is not supported. Workaround is to disable C6 support through
+ target OS and Linuxboot kernel paramter, such as "cpuidle.off=1".
+- SMI handlers are not implemented.
+- xSDT tables are not fully populated, such as processor/socket devices,
+ PCIe bridge devices.
+- There is boot stability issue. Occasionally the boot hangs at ramstage
+ with following message "BIOS PCU Misc Config Read timed out."
+- If [CB 40500 patchset] is not merged, when PCIe riser card is used,
+ boot fails.
+- PCIe devices connected to socket 1 may not work, because FSP
+ does not support PCIe topology input for socket 1.k
+- SMBIOS type 7 and type 17 are not populated.
+
+## Working
+The solution was developed using Linuxboot payload. The Linuxboot
+kernel versions tried are 4.16.18 and 5.2.9. The initramfs image is
+u-root.
+- Most SMBIOS types
+- BMC integration:
+ - BMC readiness check
+ - IPMI commands
+ - watchdog timer
+ - POST complete pin acknowledgement
+- SEL record generation
+- Early serial output
+- port 80h direct to GPIO
+- ACPI tables: APIC/DMAR/DSDT/FACP/FACS/HPET/MCFG/SPMI/SRAT/SLIT/SSDT
+
+## Technology
+
+```eval_rst
++------------------------+---------------------------------------------+
+| Processor (2 sockets) | Intel Skylake Scalable Processor LGA3647 |
++------------------------+---------------------------------------------+
+| BMC | Aspeed AST 2500 |
++------------------------+---------------------------------------------+
+| PCH | Intel Lewisburg C621 |
++------------------------+---------------------------------------------+
+```
+
+[flashrom]: https://flashrom.org/Flashrom
+[OCP]: https://www.opencompute.org/
+[OCP Tioga Pass]: https://www.opencompute.org/contributions?query=Tioga%20Pass%20v1.0
+[OCP Market Place]: https://www.opencompute.org/products/109/wiwynn-tioga-pass-advanced-2u-ocp-server-up-to-768gb-12-dimm-slots-4-ssds-for-io-performance
+[Off-the-shelf Host Firmware]: https://github.com/linuxboot/book/blob/master/case_studies/TiogaPass/README.md
+[OCP Tioga Pass POC Blog]: https://www.opencompute.org/blog/linux-firmware-boots-up-server-powered-by-intelr-xeonr-scalable-processor
+[All about u-root]: https://github.com/linuxboot/book/tree/master/u-root
+[CB 40500 patchset]: https://review.coreboot.org/c/coreboot/+/40500