2024-03-13 09:38:57 +00:00
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--- a/arch/powerpc/Kconfig
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+++ b/arch/powerpc/Kconfig
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2024-06-08 02:34:09 +00:00
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@@ -958,6 +958,14 @@ config CMDLINE_FORCE
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2024-03-13 09:38:57 +00:00
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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 EXTRA_TARGETS
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string "Additional default image types"
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help
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--- a/drivers/of/fdt.c
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+++ b/drivers/of/fdt.c
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@@ -1187,6 +1187,17 @@ int __init early_init_dt_scan_chosen(cha
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if (p != NULL && l > 0)
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strlcat(cmdline, p, min_t(int, strlen(cmdline) + (int)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(cmdline, p, min((int)l, COMMAND_LINE_SIZE));
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+#endif
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+
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handle_cmdline:
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/*
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* CONFIG_CMDLINE is meant to be a default in case nothing else
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