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bluegate010
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Feb 3, 2026
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Sure thing. Do we want to save the .drawio source file somewhere, or just the SVG?
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In this image, for example, the drawio source is embedded within the SVG, which is pretty neat.
Signed-off-by: Brett Henning <brett.henning@broadcom.com>
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Signed-off-by: Brett Henning <brett.henning@broadcom.com>
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I have someone reviewing the changes, and I need to clean up the diagram a bit, so hold off on merging for now. |
Signed-off-by: Brett Henning <brett.henning@broadcom.com>
Signed-off-by: Brett Henning <brett.henning@broadcom.com>
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@bluegate010 |
bluegate010
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Feb 24, 2026
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| Management First Boot (MFB) is a generalized term for an initialization sequence that starts the system management plane before it starts the data plane. When a system powers on, only the management plane is enabled. Conceptually, this allows a verifier to first attest all of the devices, and then a trusted management controller can enable data plane access for the successfully verified devices. | ||
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| One concrete approach to MFB for PCIe devices is to use the PCI Express Management Interface (PCIe-MI) and PCIe Enhanced System Firmware Intermediary (eSFI). The recommended sequence for eSFI is to start the system with all devices in quarantine. The trusted management controller uses a physically isolated management bus and the SPDM protocol to verify the state of all of the devices. Once a device has been successfully verified, it can be exposed to the in-band host using eSFI controls. As an optional intermediate step, the trusted management controller can enable device links in a filtered mode that enables MCTP over PCIe-VDM management and configuration cycles from the BMC, while continuing to restrict host and memory access. Conceptually, this is a filter mode that only allows BMC traffic over the PCIe bus, which is useful when there is not sideband bus available or when the sideband bus is too slow. |
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Might be useful to define VDM.
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| Management First Boot (MFB) is a generalized term for an initialization sequence that starts the system management plane before it starts the data plane. When a system powers on, only the management plane is enabled. Conceptually, this allows a verifier to first attest all of the devices, and then a trusted management controller can enable data plane access for the successfully verified devices. | ||
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| One concrete approach to MFB for PCIe devices is to use the PCI Express Management Interface (PCIe-MI) and PCIe Enhanced System Firmware Intermediary (eSFI). The recommended sequence for eSFI is to start the system with all devices in quarantine. The trusted management controller uses a physically isolated management bus and the SPDM protocol to verify the state of all of the devices. Once a device has been successfully verified, it can be exposed to the in-band host using eSFI controls. As an optional intermediate step, the trusted management controller can enable device links in a filtered mode that enables MCTP over PCIe-VDM management and configuration cycles from the BMC, while continuing to restrict host and memory access. Conceptually, this is a filter mode that only allows BMC traffic over the PCIe bus, which is useful when there is not sideband bus available or when the sideband bus is too slow. |
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A link to an eSFI definition/overview would be handy, and/or extra text about what these are and how they layer.
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Fix #84