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OvmfPkg: document DebugLevel runtime config

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Add documentation for the DebugLevel runtime config that sets the
verbosity of the serial debug log level on ArmVirt.

Signed-off-by: Luigi Leonardi <leonardi@redhat.com>
This commit is contained in:
Luigi Leonardi 2026-06-17 11:18:36 +02:00 • committed by mergify[bot]
parent f4bbef1dd7
commit af41063d81
1 changed files with 25 additions and 0 deletions
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OvmfPkg/RUNTIME_CONFIG.md
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@ -240,6 +240,31 @@ qemu-system-x86_64 -fw_cfg name=opt/org.tianocore/PagingLevel,string=5
```
## Debug: opt/org.tianocore/DebugLevel
Override the serial debug log level at boot time without rebuilding
the firmware. When set, serial port output uses this level; the
memory debug log continues to use the compiled-in level. Currently
only supported on ArmVirtQemu.
Accepted values:
- ``silent`` — only error messages (DEBUG_ERROR)
- ``verbose`` — use the compiled-in PcdDebugPrintErrorLevel
- A hex bitmask (e.g. ``0x80000040``)
When the fw_cfg entry is absent, the value of
``PcdSerialDebugPrintErrorLevel`` is used (default: ``verbose``).
Usage:
```
qemu-system-aarch64 -fw_cfg name=opt/org.tianocore/DebugLevel,string=silent
qemu-system-aarch64 -fw_cfg name=opt/org.tianocore/DebugLevel,string=verbose
qemu-system-aarch64 -fw_cfg name=opt/org.tianocore/DebugLevel,string=0x80000000
```
## Other: opt/org.tianocore/UsbStorageSupport
This enables/disables the edk2 driver for USB storage devices.