TF-A: Document SMC_PCI_SUPPORT option
Add some basic documentation and pointers for the SMCCC PCI
build options.
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Change-Id: Ia35f31d15066ea74135367cde2dce2f26e6ab31e
diff --git a/docs/getting_started/build-options.rst b/docs/getting_started/build-options.rst
index 2c3cd6b..99fc21d 100644
--- a/docs/getting_started/build-options.rst
+++ b/docs/getting_started/build-options.rst
@@ -579,6 +579,11 @@
``BL31_NOBITS_LIMIT``. When the option is ``0`` (the default), NOBITS
sections are placed in RAM immediately following the loaded firmware image.
+- ``SMC_PCI_SUPPORT``: This option allows platforms to handle PCI configuration
+ access requests via a standard SMCCC defined in `DEN0115`_. When combined with
+ UEFI+ACPI this can provide a certain amount of OS forward compatibility
+ with newer platforms that aren't ECAM compliant.
+
- ``SPD``: Choose a Secure Payload Dispatcher component to be built into TF-A.
This build option is only valid if ``ARCH=aarch64``. The value should be
the path to the directory containing the SPD source, relative to
@@ -849,3 +854,6 @@
--------------
*Copyright (c) 2019-2021, Arm Limited. All rights reserved.*
+
+.. _DEN0115: https://developer.arm.com/docs/den0115/latest
+