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Update release notes

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- we have no div, use Zmmul.
- the USS is no longer used if not supplied.

Signed-off-by: Daniel Lublin <daniel@lublin.se>
This commit is contained in:
Michael Cardell Widerkrantz 2022-12-01 15:51:53 +01:00 committed by Daniel Lublin
parent 70f5cbf22e
commit dfdb2809e4
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doc/release_notes.md
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@ -6,7 +6,7 @@ Descriptions of the tagged TKey releases.
## Tag XYZ
XYZ is a general release of the development kit first presented
as a limited engineering-release. The main changes ar polishing,
as a limited engineering-release. The main changes are polishing,
completion and bug fixing since the engineering-release.
@ -24,24 +24,22 @@ completion and bug fixing since the engineering-release.
- (HW) The UART default bitrate has been icreased to 62500 bps.
- (HW) Support for division instruction (div) was removed from
PicoRV32. Please compile your programs with the Zmmul extension,
`-march=rv32iczmmul` for `clang`.
- (FW) The firmware has been restructured to be a Finite State
Machine (FSM) with defined states for booting, loading
applications, measure applications, calculate the CDI and
start the loaded application.
This change also changes the firmware protocol which now accepts a
request to load a binary with an optional USS and automatically
returns its digest and start the program when the last data chunk is
received.
### Limititations
#### User Supplied Secret - Breaking change!
*Nota bene* From commit 99efb78ed8ba69799045cff6c42c4a71bffdb703 the
computed CDI secret is also taking the User Supplied Secret into
account *even if the USS is not supplied*! This means if you start
using firmware from this commit and onwards your CDI and with it the
private key of the signerapp will change even if you haven't changed
the app in any way.
## engineering-release-1
### Hardware