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doc: Add (most) nvram debugging options
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
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.. _power-mgt-devtree: | ||
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ibm,opal/power-mgt device tree entries | ||
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xscom-node-bindings | ||
xive | ||
imc | ||
power-management | ||
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OPAL ABI | ||
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Power Management | ||
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See :ref:`power-mgt-devtree` for device tree structure describing power management facilities. | ||
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Debugging | ||
--------- | ||
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There exist a few debug knobs that can be set via nvram settings. These are | ||
**not** ABI and may be changed or removed at *any* time. | ||
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Disabling specific stop states | ||
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
On boot, specific stop states can be disabled via setting a mask. For example, | ||
to disable all but stop 0,1,2, use ~0xE0000000. :: | ||
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nvram -p ibm,skiboot --update-config opal-stop-state-disable-mask=0x1FFFFFFF |