diff --git a/arch/loongarch/kernel/legacy_boot.h b/arch/loongarch/kernel/legacy_boot.h
index 982bf9b1de72571654c34588d5e25e002bc84177..104d8c53bd2dc295d2a1b97845f02cba89b376c7 100644
--- a/arch/loongarch/kernel/legacy_boot.h
+++ b/arch/loongarch/kernel/legacy_boot.h
@@ -3,6 +3,7 @@
 #define __LEGACY_BOOT_H_
 #include <linux/screen_info.h>
 #include <linux/of_address.h>
+#include <asm/loongson.h>
 #define ADDRESS_TYPE_SYSRAM	1
 #define ADDRESS_TYPE_RESERVED	2
 #define ADDRESS_TYPE_ACPI	3
@@ -87,4 +88,6 @@ extern int __init
 pch_msi_parse_madt(union acpi_subtable_headers *header,
 		const unsigned long end);
 extern struct irq_domain *get_pchpic_irq_domain(void);
+
+extern __init void fw_init_cmdline(unsigned long argc, unsigned long cmdp);
 #endif
diff --git a/arch/loongarch/kernel/relocate.c b/arch/loongarch/kernel/relocate.c
index 1acfa704c8d09b95b625da9fd047833b181d35f7..aaa27823ea29d7d9c473c8877bdd2f233b693f91 100644
--- a/arch/loongarch/kernel/relocate.c
+++ b/arch/loongarch/kernel/relocate.c
@@ -15,6 +15,7 @@
 #include <asm/inst.h>
 #include <asm/sections.h>
 #include <asm/setup.h>
+#include "legacy_boot.h"
 
 #define RELOCATED(x) ((void *)((long)x + reloc_offset))
 #define RELOCATED_KASLR(x) ((void *)((long)x + random_offset))
@@ -172,7 +173,10 @@ unsigned long __init relocate_kernel(void)
 	void *location_new = _text; /* Default to original kernel start */
 	char *cmdline = early_ioremap(fw_arg1, COMMAND_LINE_SIZE); /* Boot command line is passed in fw_arg1 */
 
-	strscpy(boot_command_line, cmdline, COMMAND_LINE_SIZE);
+	if (fw_arg0 < 2)
+		strscpy(boot_command_line, cmdline, COMMAND_LINE_SIZE);
+	else
+		fw_init_cmdline(fw_arg0, TO_CACHE(fw_arg1)); /* OLD BPI parameters */
 
 #ifdef CONFIG_RANDOMIZE_BASE
 	location_new = determine_relocation_address();