coreboot/Documentation/mainboard/ocp/deltalake.md

OCP Delta Lake

This page describes coreboot support status for the OCP (Open Compute Project) Delta Lake server platform.

Introduction

OCP Delta Lake server platform is a component of multi-host server system Yosemite-V3. Both were announced by Facebook and Intel in OCP virtual summit 2020.

Delta Lake server is a single socket Cooper Lake Scalable Processor (CPX-SP) server.

Yosemite-V3 has multiple configurations. Depending on configurations, it may host up to 4 Delta Lake servers (blades) in one sled.

The Yosemite-V3 system is in mass production. Facebook, Intel and partners jointly develop Open System Firmware (OSF) solution on Delta Lake as an alternative solution. The OSF solution is based on FSP/coreboot/LinuxBoot stack. The OSF solution reached DVT exit equivalent status.

Required blobs

Delta Lake server OSF solution requires:

• FSP blob: The blob (Intel Cooper Lake Scalable Processor Firmware Support Package) is not yet available to the public. It will be made public soon by Intel with redistributable license.
• Microcode: Available through github.com:otcshare/Intel-Generic-Microcode.git.
• ME binary: Ignition binary will be made public soon by Intel with redistributable license.
• ACM binaries: only required for CBnT enablement. Available under NDA with Intel.

Payload

• LinuxBoot: This is necessary only if you use LinuxBoot as coreboot payload. U-root as initramfs, is used in the joint development. 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

From OpenBMC, to update FW image: fw-util slotx --update bios

To power off/on the host: power-util slotx off power-util slotx on

To connect to console through SOL (Serial Over Lan): sol-util slotx

Firmware configurations

ChromeOS VPD is used to store most of the firmware configurations. RO_VPD region holds default values, while RW_VPD region holds customized values.

VPD variables supported are:

• firmware_version: This variable holds overall firmware version. coreboot uses that value to populate smbios type 1 version field.
• bmc_bootorder_override: When it's set to 1 IPMI OEM command can override boot order. The boot order override is done in the u-root LinuxBoot payload.
• systemboot_log_level: u-root package systemboot log levels, would be mapped to quiet/verbose in systemboot as that is all we have for now. 5 to 8 would be mapped to verbose, 0 to 4 and 9 would be mapped to quiet.
• VPDs affecting coreboot are listed/documented in src/mainboard/ocp/deltalake/vpd.h.

Working features

The solution is developed using LinuxBoot payload with Linux kernel 5.2.9, and u-root as initramfs.

• SMBIOS:
  • Type 0 -- BIOS Information
  • Type 1 -- System Information
  • Type 2 -- Baseboard Information
  • Type 3 -- System Enclosure or Chassis
  • Type 4 -- Processor Information
  • Type 7 -- Cache Information
  • Type 8 -- Port Connector Information
  • Type 9 -- PCI Slot Information
  • Type 11 -- OEM String
  • Type 16 -- Physical Memory Array
  • Type 17 -- Memory Device
  • Type 19 -- Memory Array Mapped Address
  • Type 32 -- System Boot Information
  • Type 38 -- IPMI Device Information
  • Type 41 -- Onboard Devices Extended Information
  • Type 127 -- End-of-Table
• BMC integration:
  • BMC readiness check
  • IPMI commands
  • watchdog timer
  • POST complete pin acknowledgement
  • Check BMC version: ipmidump -device
• SEL record generation
• Converged Bootguard and TXT (CBnT)
  • TPM
  • Bootguard profile 0T
  • TXT
  • SRTM
  • DRTM (verified through tboot)
    • unsigned KM/BPM generation
    • KM/BPM signing
    • memory secret clearance upon ungraceful shutdown
• Early serial output
• port 80h direct to GPIO
• ACPI tables: APIC/DMAR/DSDT/EINJ/FACP/FACS/HEST/HPET/MCFG/SPMI/SRAT/SLIT/SSDT
• Skipping memory training upon subsequent reboots by using MRC cache
• BMC crash dump
• Error injection through ITP
• Versions
  • Check FSP version: cbmem | grep LB_TAG_PLATFORM_BLOB_VERSION
  • Check Microcode version: cat /proc/cpuinfo | grep microcode
• Devices:
  • Boot drive
  • All 5 data drives
  • NIC card
• Power button
• localboot
• netboot from IPv6
• basic memory hardware error injection/detection (SMI handlers not upstreamed)
• basic PCIe hardware error injection/detection (SMI handlers not upstreamed)

Stress/performance tests passed

• OS warm reboot (1000 cycles)
• DC reboot (1000 cycles)
• AC reboot (1000 cycle)
• Mprime test (6 hours)
• StressAppTest (6 hours)
• Ptugen (6 hours)

Performance on par with traditional firmware

• coremark
• FIO
• Iperf(IPv6)
• Linpack
• Intel MLC (memory latency and bandwidth)
• SpecCPU
• stream

Other tests passed

• Power
• Thermal
• coreboot address sanitizer (both romstage and ramstage)
• Intel selftest tool (all errors analyzed; applicable errors clean)

Known issues

• HECI access at OS run time:
  • spsInfoLinux64 command fail to return ME version
  • ptugen command fail to get memory power
• CLTT (Closed Loop Thermal Throttling, eg. thermal protection for DIMMs)
• ProcHot (thermal protection for processors)

Feature gaps

• flashrom command not able to update ME region
• ACPI BERT table
• PCIe hotplug through VPP (Virtual Pin Ports)
• PCIe Live Error Recovery
• RO_VPD region as well as other RO regions are not write protected
• Not able to selectively enable/disable core

Technology

+------------------------+---------------------------------------------+
| Processor (1 socket)   | Intel Cooper Lake Scalable Processor        |
+------------------------+---------------------------------------------+
| BMC                    | Aspeed AST 2500                             |
+------------------------+---------------------------------------------+
| PCH                    | Intel Lewisburg C620 Series                 |
+------------------------+---------------------------------------------+