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Update release notes

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Signed-off-by: Daniel Lublin <daniel@lublin.se>
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Daniel Lublin 2023-01-31 09:18:01 +01:00
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doc/release_notes.md
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@ -7,8 +7,9 @@ Descriptions of the tagged TKey releases.
XYZ is a general release of the development kit first presented XYZ is a general release of the development kit first presented
as a limited engineering-release. The main changes are polishing, as a limited engineering-release. The main changes are polishing,
completion and bug fixing since the engineering-release. completion and bug fixing since the engineering-releases.
## engineering-release-2
### New and improved functionality ### New and improved functionality
@ -28,6 +29,13 @@ completion and bug fixing since the engineering-release.
PicoRV32. Please compile your programs with the Zmmul extension, PicoRV32. Please compile your programs with the Zmmul extension,
`-march=rv32iczmmul` for `clang`. `-march=rv32iczmmul` for `clang`.
- (HW) The UDI is locked down and can now only be accessed by
firmware, not in app-mode.
- (HW) The timer MMIO API now takes separate start and stop bits for
triggering the respective action, mitigating a time-of-check to
time-of-use (TOCTOU) issue.
- (FW) The firmware has been restructured to be a Finite State - (FW) The firmware has been restructured to be a Finite State
Machine (FSM) with defined states for booting, loading Machine (FSM) with defined states for booting, loading
applications, measure applications, calculate the CDI and applications, measure applications, calculate the CDI and
@ -38,7 +46,14 @@ completion and bug fixing since the engineering-release.
returns its digest and start the program when the last data chunk is returns its digest and start the program when the last data chunk is
received. received.
### Limititations - (FW) A BLAKE2s function present in firmware is now exposed for use
by TKey apps (through a function pointer located in MMIO `BLAKE2S`).
See [software.md](system_description/software.md) for more
information.
- (FW) To protect against warm boot attacks, the firmware sleeps for a
random number of cycles before reading out the sensitive UDS into
FW RAM.
## engineering-release-1 ## engineering-release-1