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Add notes related to power and security for 12.0 release #648

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65a58db
feat(security): Add note about firewall exception during boot
jsuhaas22 Apr 2, 2026
289e628
feat(power): overview: Note requirement of latest firmware on 12.0
jsuhaas22 Apr 2, 2026
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6 changes: 6 additions & 0 deletions source/linux/Foundational_Components/Power_Management/pm_overview.rst
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Expand Up @@ -11,6 +11,12 @@
Power Management techniques can broadly be classified into two categories:
Dynamic Power Management and Static Power Management.

.. note::

With ti-u-boot-2026.01, LPM works only if ti-linux-firmware is 12.0 or

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[vale] reported by reviewdog 🐶
[RedHat.CaseSensitiveTerms] Use 'Linux' rather than 'linux'.

Raw Output:
{"message": "[RedHat.CaseSensitiveTerms] Use 'Linux' rather than 'linux'.", "location": {"path": "source/linux/Foundational_Components/Power_Management/pm_overview.rst", "range": {"start": {"line": 16, "column": 49}}}, "severity": "WARNING"}

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[vale] reported by reviewdog 🐶
[RedHat.Definitions] Define acronyms and abbreviations (such as 'LPM') on first occurrence if they're likely to be unfamiliar.

Raw Output:
{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'LPM') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/linux/Foundational_Components/Power_Management/pm_overview.rst", "range": {"start": {"line": 16, "column": 28}}}, "severity": "INFO"}
newer. On older firmware images and new U-Boot, LPM fails and the device

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[vale] reported by reviewdog 🐶
[RedHat.Definitions] Define acronyms and abbreviations (such as 'LPM') on first occurrence if they're likely to be unfamiliar.

Raw Output:
{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'LPM') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/linux/Foundational_Components/Power_Management/pm_overview.rst", "range": {"start": {"line": 17, "column": 52}}}, "severity": "INFO"}
requires a reboot.

.. rubric:: Dynamic Power Management

Dynamic Power Management techniques reduce the active power
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7 changes: 7 additions & 0 deletions source/linux/Foundational_Components/System_Security/Memory_Firewalls.rst
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modifying U-Boot source code, recompiling it, and transferring the new
binaries to the boot partition.

.. note::

Currently, TIFS logs report a firewall read violation during boot. This
occurs because A53 speculatively accesses TF-A's memory region, which is
protected from non-secure access by a firewall. This occurs only once, since

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[vale] reported by reviewdog 🐶
[RedHat.TermsSuggestions] Depending on the context, consider using 'after' or 'when' rather than 'once'.

Raw Output:
{"message": "[RedHat.TermsSuggestions] Depending on the context, consider using 'after' or 'when' rather than 'once'.", "location": {"path": "source/linux/Foundational_Components/System_Security/Memory_Firewalls.rst", "range": {"start": {"line": 89, "column": 69}}}, "severity": "INFO"}

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[vale] reported by reviewdog 🐶
[RedHat.TermsErrors] Use 'insecure' rather than 'non-secure'.

Raw Output:
{"message": "[RedHat.TermsErrors] Use 'insecure' rather than 'non-secure'.", "location": {"path": "source/linux/Foundational_Components/System_Security/Memory_Firewalls.rst", "range": {"start": {"line": 89, "column": 19}}}, "severity": "ERROR"}
TF-A's memory region is unmapped from the page table afterwards.

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[vale] reported by reviewdog 🐶
[RedHat.TermsSuggestions] Depending on the context, consider using 'afterward' rather than 'afterwards'.

Raw Output:
{"message": "[RedHat.TermsSuggestions] Depending on the context, consider using 'afterward' rather than 'afterwards'.", "location": {"path": "source/linux/Foundational_Components/System_Security/Memory_Firewalls.rst", "range": {"start": {"line": 90, "column": 57}}}, "severity": "INFO"}

Check warning on line 90 in source/linux/Foundational_Components/System_Security/Memory_Firewalls.rst

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GitHub Actions / vale 

[vale] reported by reviewdog 🐶
[RedHat.PassiveVoice] 'is unmapped' is passive voice. In general, use active voice. Consult the style guide for acceptable use of passive voice.

Raw Output:
{"message": "[RedHat.PassiveVoice] 'is unmapped' is passive voice. In general, use active voice. Consult the style guide for acceptable use of passive voice.", "location": {"path": "source/linux/Foundational_Components/System_Security/Memory_Firewalls.rst", "range": {"start": {"line": 90, "column": 25}}}, "severity": "INFO"}

Modify U-Boot Configuration
===========================

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