201027915 EFR32MG22, BG22, FG22 Virtual Secure Element Firmware Update
2020-10-30
Description of Change:
Silicon Labs announces Virtual Secure Element (VSE) firmware version 1.2.6 for EFR32MG22, EFR32BG22, EFR32BG22C112 and EFR32FG22 SoCs.
Reason for Change:
This is a firmware update to address a vulnerability. Details are covered in Security Advisory - A-00000114 and also in Software Advisory - A-00000117.
VSE firmware version 1.2.5 and earlier have the following issues:
1. A device whose VSE firmware has been successfully upgraded at least once can become inoperable if the upgrade file is removed from flash after the upgrade and the device is subjected to a large cumulative number of resets. The exact number of reset cycles before failure varies due to process variations and operating temperature but would typically range between 50,000and 200,000 cycles. It is imperative that this fix be applied to every device to avoid latent failures.
2. In the event of a momentary power failure whose duration is sufficient to cause only a few specific RAM bits to lose state, the POR boot process can terminate in a hard fault.
VSE v1.2.6 fixes both issues. Silicon Labs manufacturing production has been updated as of October 19 , 2020, to apply VSE version 1.2.6 so that new production devices will not have this issue.
Silicon Labs announces Virtual Secure Element (VSE) firmware version 1.2.6 for EFR32MG22, EFR32BG22, EFR32BG22C112 and EFR32FG22 SoCs.
Reason for Change:
This is a firmware update to address a vulnerability. Details are covered in Security Advisory - A-00000114 and also in Software Advisory - A-00000117.
VSE firmware version 1.2.5 and earlier have the following issues:
1. A device whose VSE firmware has been successfully upgraded at least once can become inoperable if the upgrade file is removed from flash after the upgrade and the device is subjected to a large cumulative number of resets. The exact number of reset cycles before failure varies due to process variations and operating temperature but would typically range between 50,000and 200,000 cycles. It is imperative that this fix be applied to every device to avoid latent failures.
2. In the event of a momentary power failure whose duration is sufficient to cause only a few specific RAM bits to lose state, the POR boot process can terminate in a hard fault.
VSE v1.2.6 fixes both issues. Silicon Labs manufacturing production has been updated as of October 19 , 2020, to apply VSE version 1.2.6 so that new production devices will not have this issue.
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