Device Firmware Boot
If device firmware is not in TCB, it must be verified by the system firmware or device firmware in TCB.
During system boot, host firmware may choose to verify some device firmware components. For device firmware stored in the device’s internal storage, verification may happen based upon device policy. For device firmware images in external storage loaded at runtime, verification is mandatory. Device firmware verification may follow the same rules as the system firmware verification. Device firmware is only loaded after it is verified.
Table 4-1: Device Firmware Boot Verification
Item
Entity
Provider
Location
TP
Device Firmware Verification
OEM or IHV
Flash (Read Only Code), Device ROM.
CDI
System Firmware or Device firmware TCB
OEM or IHV
Flash (Read Only Code), ROM
Device Firmware Signature Database (Policy)
OEM or IHV
Flash (Read Only Data), ROM
UDI
Device Firmware
IHV
Device Internal Storage (or) External Storage (e.g. Hard drive, USB, Memory, or Read-Write Flash)
Last modified 1yr ago
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