File syslinux-openbsd-bootparams-4.05.patch of Package syslinux

--- core/bootsect.inc.orig	2011-12-09 19:28:17.000000000 +0100
+++ core/bootsect.inc	2012-07-29 14:50:42.655812020 +0200
@@ -42,6 +42,29 @@
 		mov bx,abort_check	; Don't print dots, but allow abort
 		call load_high
 
+		; Write the boot param signature after the image
+		xor ecx, ecx
+		mov cx, bparams_sig_len
+		mov esi, bparams_sig
+		cld
+		call bcopy
+
+		; Zero terminate the boot params
+		push es
+		push real_mode_seg
+		pop es
+		mov bx, [CmdLinePtr]
+		mov [es:bx], byte 0
+		pop es
+ 
+		; Write the boot params
+		xor ecx, ecx
+		mov cx, [CmdLinePtr]
+		sub cx, cmd_line_here
+		inc ecx
+		mov esi, real_mode_seg + cmd_line_here
+		call bcopy
+
 		sub edi,free_high_memory
 		mov [trackbuf+8],edi	; Save length
 
@@ -214,6 +237,13 @@
 
 		jmp shuffle_and_boot_raw
 
+
+                section .data
+bparams_sig	db 'BootParams:'
+bparams_sig_len		equ $-bparams_sig
+
+		section .text
+
 		; This stub gets run after the shuffle.  It is copied
 		; below 0x7c00 in order to properly handle the case
 		; of bootstrap replacement.