1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1730,6 +1730,14 @@ config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEN
endchoice
+config CMDLINE_OVERRIDE
+ bool "Use alternative cmdline from device tree"
+ help
+ Some bootloaders may have uneditable bootargs. While CMDLINE_FORCE can
+ be used, this is not a good option for kernels that are shared across
+ devices. This setting enables using "chosen/cmdline-override" as the
+ cmdline if it exists in the device tree.
+
config CMDLINE
string "Default kernel command string"
default ""
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -1162,6 +1162,17 @@ int __init early_init_dt_scan_chosen(uns
if (p != NULL && l > 0)
strlcat(data, p, min_t(int, strlen(data) + (int)l, COMMAND_LINE_SIZE));
+ /* CONFIG_CMDLINE_OVERRIDE is used to fallback to a different
+ * device tree option of chosen/bootargs-override. This is
+ * helpful on boards where u-boot sets bootargs, and is unable
+ * to be modified.
+ */
+#ifdef CONFIG_CMDLINE_OVERRIDE
+ p = of_get_flat_dt_prop(node, "bootargs-override", &l);
+ if (p != NULL && l > 0)
+ strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
+#endif
+
/*
* CONFIG_CMDLINE is meant to be a default in case nothing else
* managed to set the command line, unless CONFIG_CMDLINE_FORCE
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -2057,6 +2057,14 @@ config CMDLINE_FORCE
endchoice
+config CMDLINE_OVERRIDE
+ bool "Use alternative cmdline from device tree"
+ help
+ Some bootloaders may have uneditable bootargs. While CMDLINE_FORCE can
+ be used, this is not a good option for kernels that are shared across
+ devices. This setting enables using "chosen/cmdline-override" as the
+ cmdline if it exists in the device tree.
+
config EFI_STUB
bool
|
