8cd6686ef8
This patch adds a new kernel option called CONFIG_CMDLINE_OVERRIDE. This setting is for devices with locked down u-boot environments, where users are unable to change the default bootargs. When set, the fdt driver will propagate the cmdline for the kernel from chosen/bootargs-override instead of chosen/bootargs as long as it exists within the DTB. Signed-off-by: Chris Blake <chrisrblake93@gmail.com>
38 lines
1.3 KiB
Diff
38 lines
1.3 KiB
Diff
--- a/arch/powerpc/Kconfig
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+++ b/arch/powerpc/Kconfig
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@@ -707,6 +707,14 @@ config CMDLINE_FORCE
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This is useful if you cannot or don't want to change the
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command-line options your boot loader passes to the kernel.
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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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@@ -1079,6 +1079,17 @@ 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((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(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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