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extra-build-config: Add documentation for the ISOLATED_CPUS configuration variable

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Signed-off-by: Andrew Penner <andrew.penner@protonmail.com>
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Andrew Penner 2022-04-01 21:43:53 +01:00 committed by Andrei Gherzan
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commit 8eff5d59ed
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docs/extra-build-config.md
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@ -278,6 +278,18 @@ the header extension should set the following in local.conf:
ENABLE_DWC2_HOST = "1"
## Set CPUs to be isolated from the standard Linux scheduler
By default Linux will use all available CPUs for scheduling tasks. For real time
purposes there can be an advantage to isolating one or more CPUs from the
standard scheduler. It should be noted that CPU 0 is special, it is the only CPU
available during the early stages of the boot process and cannot be isolated.
The string assigned to this variable may be a single CPU number, a comma
separated list ("1,2"), a range("1-3"), or a mixture of these ("1,3-5")
ISOLATED_CPUS = "1-2"
## Enable Openlabs 802.15.4 radio module
When using device tree kernels, set this variable to enable the 802.15.4 hat: