1 comment:
* Version 2 of the SMM requires as SMMSTORE of at least 256KiB of size, that
* has to be aligned to 64KiB.
* This allows the payload to store raw data in the SMMSTORE flash region.
* This can be used by a FaultTolerantWrite implementation, that uses at least
* two regions in an A/B update scheme.
64KiB is the minimum for UEFI variable store + 64KiB as FaultTolerantWrite backup. […]
There are usually 3 regions used by EDK.
All regions must be block aligned.
The FTW Spare size must be greater than the variable store. In this case 64KiB + 1 block.
The FTW Working Size can be much smaller than 64KiB.
That sums up to:
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