--- zzzz-none-000/linux-5.4.213/arch/mips/kernel/prom.c	2022-09-15 10:04:56.000000000 +0000
+++ alder-5690pro-762/linux-5.4.213/arch/mips/kernel/prom.c	2024-08-14 09:01:30.000000000 +0000
@@ -64,6 +64,9 @@
 
 void __init __dt_setup_arch(void *bph)
 {
+	if (boot_command_line[0] == '\0')
+		strlcpy(boot_command_line, arcs_cmdline, sizeof(boot_command_line));
+
 	if (!early_init_dt_scan(bph))
 		return;