SWRZ161C December   2024  – August 2026 CC2744R7-Q1 , CC2745P10-Q1 , CC2745R10-Q1 , CC2745R7-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Advisories Matrix
  5. 2Nomenclature, Package Symbolization, and Revision Identification
    1. 2.1 Device and Development Support—Tool Nomenclature
    2. 2.2 Devices Supported
    3. 2.3 Package Symbolization and Revision Identification
  6. 3Advisories
    1. 3.1  ADC_08
    2. 3.2  ADC_09
    3. 3.3  BATMON_01
    4. 3.4  BATMON_02
    5. 3.5  SYS_204
    6. 3.6  SYS_206
    7. 3.7  SYS_207
    8. 3.8  SYS_211
    9. 3.9  APU_201
    10. 3.10 HSM_01
    11. 3.11 UDMA_01
    12. 3.12 RADIO_05
    13. 3.13 SYSROM_01
  7. 4Revision History

3.10 HSM_01

Updated retry mechanism for RNG health check initialization

Revisions Affected

E and F

Details

On CC27XX devices using CRNG, a firmware limitation could cause the device to halt during RNG configuration or HUK token provisioning when CRNG encountered a transient low-entropy condition. CRNG entropy is influenced by system activity and may temporarily require additional time to accumulate. Since previous versions of the SimpleLink Low Power F3 SDK's HSM firmware support were initially built without accounting for this, it would halt on the first health check failure rather than waiting for entropy to stabilize.

Workaround

HSM firmware version 3.4.5 and higher provides a firmware-oriented approach to reviving device entropy generation levels when encountering transient low-entropy conditions. This is achieved with a retry mechanism targeting the initial seed of the DRBG engine.

This workaround is incorporated into the SimpleLink™ Low Power F3 software development kit (SDK) 9.14.04, 9.20.01, and newer. This HSM firmware is backwards compatible with older versions of the SDK.