CONFIG_CMDLINE_FROM_BOOTCONFIG: Render embedded bootconfig as kernel cmdline at build time

General informations

The Linux kernel configuration item CONFIG_CMDLINE_FROM_BOOTCONFIG:

• prompt: Render embedded bootconfig as kernel cmdline at build time
• type: bool
• depends on: ( CONFIG_BOOT_CONFIG_EMBED_FILE != "") && ( CONFIG_ARCH_SUPPORTS_CMDLINE_FROM_BOOTCONFIG ) && ( CONFIG_CMDLINE = "")
• defined in init/Kconfig
• found in Linux kernels: 7.3-rc+HEAD

Help text

Render the "kernel" subtree of the embedded bootconfig file into a flat cmdline string at kernel build time and prepend it to boot_command_line during early architecture setup. This makes early_param() handlers (e.g. mem=, earlycon=, loglevel=) see the values supplied via the embedded bootconfig.

The runtime bootconfig parser is unaffected, so tree-structured consumers such as ftrace boot-time tracing keep working.

Note: when an initrd also carries a bootconfig, its "kernel" subtree is still parsed at runtime, but the embedded "kernel" keys remain in boot_command_line for parse_early_param() and end up later than the initrd keys in saved_command_line, so parse_args() last-wins favors the embedded values. If you need initrd to override embedded kernel.* keys, leave this option off.

If unsure, say N.

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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