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38 lines
1.3 KiB
Diff
38 lines
1.3 KiB
Diff
--- a/arch/arm/Kconfig
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+++ b/arch/arm/Kconfig
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@@ -1793,6 +1793,14 @@ config ARM_ATAG_DTB_COMPAT_CMDLINE_MANGL
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endchoice
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+config CMDLINE_OVERRIDE
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+ bool "Use alternative cmdline from device tree"
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+ help
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+ Some bootloaders may have uneditable bootargs. While CMDLINE_FORCE can
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+ be used, this is not a good option for kernels that are shared across
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+ devices. This setting enables using "chosen/cmdline-override" as the
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+ cmdline if it exists in the device tree.
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+
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config CMDLINE
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string "Default kernel command string"
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default ""
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--- a/drivers/of/fdt.c
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+++ b/drivers/of/fdt.c
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@@ -1056,6 +1056,17 @@ int __init early_init_dt_scan_chosen(uns
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if (p != NULL && l > 0)
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strlcpy(data, p, min(l, COMMAND_LINE_SIZE));
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+ /* CONFIG_CMDLINE_OVERRIDE is used to fallback to a different
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+ * device tree option of chosen/bootargs-override. This is
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+ * helpful on boards where u-boot sets bootargs, and is unable
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+ * to be modified.
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+ */
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+#ifdef CONFIG_CMDLINE_OVERRIDE
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+ p = of_get_flat_dt_prop(node, "bootargs-override", &l);
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+ if (p != NULL && l > 0)
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+ strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
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+#endif
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+
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/*
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* CONFIG_CMDLINE is meant to be a default in case nothing else
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* managed to set the command line, unless CONFIG_CMDLINE_FORCE
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