CONFIG_EARLY_PRINTK_USB_XDBC: Early printk via the xHCI debug port

General informations

The Linux kernel configuration item CONFIG_EARLY_PRINTK_USB_XDBC:

• prompt: Early printk via the xHCI debug port
• type: bool
• depends on: CONFIG_EARLY_PRINTK && CONFIG_PCI
• defined in arch/x86/Kconfig.debug
• found in Linux kernels: 4.12–4.20, 5.0–5.19, 6.0–6.12

Help text

Write kernel log output directly into the xHCI debug port.

One use for this feature is kernel debugging, for example when your machine crashes very early before the regular console code is initialized. Other uses include simpler, lockless logging instead of a full-blown printk console driver + klogd.

For normal production environments this is normally not recommended, because it doesn't feed events into klogd/syslogd and doesn't try to print anything on the screen.

You should normally say N here, unless you want to debug early crashes or need a very simple printk logging facility.

Hardware

LKDDb

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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