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feat(linux): PCIe Root Complex: Document support for 64-Bit Address Space #309

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praneethbajjuri merged 1 commit into from
Jun 4, 2025
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feat(linux): PCIe Root Complex: Document support for 64-Bit Address Space #309

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11 changes: 11 additions & 0 deletions .../linux/Foundational_Components/Kernel/Kernel_Drivers/PCIe/PCIe_Root_Complex.rst
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Expand Up @@ -668,6 +668,17 @@ Following is a brief explanation of layers shown in the diagram:
<value> is the resulting value to be written with "EC" bit of the
register set.

.. rubric:: **64-Bit Address Space with 4 GB Size**
:name: 64-bit-address-space

The PCIe Controller support for 64-Bit addressing in the System's
Address Space with 4 GB Size is enabled in the device-tree.
The 4 GB region is split as:

1. 4 KB ECAM region for Configuration Accesses
2. 1 MB IO region
3. Remaining region (4 GB - 1 MB - 4 KB) as 32-bit Non-Prefetchable MEM

.. rubric:: **Testing Details**
:name: testing-details

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