The following diff:
- simplifies an internal interface by removing unused arguments
- removes commented-out code
- only flushes the cache for program headers marked executable, thus
  being faster at loading the non-code parts of the kernel.

Index: Locore.c
===================================================================
RCS file: /OpenBSD/src/sys/arch/sparc64/stand/ofwboot/Locore.c,v
diff -u -p -r1.18 Locore.c
--- Locore.c	1 Jun 2023 17:24:56 -0000	1.18
+++ Locore.c	14 Nov 2025 09:01:32 -0000
@@ -304,7 +304,7 @@ OF_milliseconds(void)
 }
 
 void
-OF_chain(void *virt, u_int size, void (*entry)(), void *arg, u_int len)
+OF_chain(void (*entry)(), void *arg, u_int len)
 {
 	extern int64_t romp;
 
Index: boot.c
===================================================================
RCS file: /OpenBSD/src/sys/arch/sparc64/stand/ofwboot/boot.c,v
diff -u -p -r1.44 boot.c
--- boot.c	26 Mar 2024 14:46:48 -0000	1.44
+++ boot.c	14 Nov 2025 09:01:32 -0000
@@ -201,13 +201,12 @@ chain(u_int64_t pentry, char *args, void
 	l = sizeof(newargs);
 
 #ifdef DEBUG
-	printf("chain: calling OF_chain(%x, %x, %x, %x, %x)\n",
-	    (void *)RELOC, end - (char *)RELOC, entry, args, l);
+	printf("chain: calling OF_chain(%p, %p, %x)\n",
+	    entry, args, l);
 #endif
 	/* if -D is set then pause in the PROM. */
 	if (debug > 1) OF_enter();
-	OF_chain((void *)RELOC, ((end - (char *)RELOC)+PAGE_SIZE)%PAGE_SIZE,
-	    entry, args, l);
+	OF_chain(entry, args, l);
 	panic("chain");
 }
 
Index: elf64_exec.c
===================================================================
RCS file: /OpenBSD/src/sys/arch/sparc64/stand/ofwboot/elf64_exec.c,v
diff -u -p -r1.18 elf64_exec.c
--- elf64_exec.c	9 Nov 2023 14:26:34 -0000	1.18
+++ elf64_exec.c	14 Nov 2025 09:01:32 -0000
@@ -170,7 +170,8 @@ elf64_exec(int fd, Elf_Ehdr *elf, u_int6
 			printf("read segment: %s\n", strerror(errno));
 			return (1);
 		}
-		syncicache((void *)(long)phdr.p_vaddr, phdr.p_filesz);
+		if (phdr.p_flags & PF_X)
+			syncicache((void *)(long)phdr.p_vaddr, phdr.p_filesz);
 
 		/* Zero BSS. */
 		if (phdr.p_filesz < phdr.p_memsz) {
Index: openfirm.h
===================================================================
RCS file: /OpenBSD/src/sys/arch/sparc64/stand/ofwboot/openfirm.h,v
diff -u -p -r1.7 openfirm.h
--- openfirm.h	26 Jun 2018 19:43:27 -0000	1.7
+++ openfirm.h	14 Nov 2025 09:01:32 -0000
@@ -54,7 +54,7 @@ int OF_seek(u_int handle, u_int64_t pos)
 void *OF_claim(void *virt, u_int size, u_int align);
 void OF_release(void *virt, u_int size);
 int OF_milliseconds(void);
-void OF_chain(void *addr, u_int size, void (*entry)(), void *parm, u_int parmlen);
+void OF_chain(void (*entry)(), void *parm, u_int parmlen);
 int OF_peer(int);
 int OF_child(int);
 int OF_parent(int);
Index: srt0.s
===================================================================
RCS file: /OpenBSD/src/sys/arch/sparc64/stand/ofwboot/srt0.s,v
diff -u -p -r1.7 srt0.s
--- srt0.s	8 Dec 2022 01:25:45 -0000	1.7
+++ srt0.s	14 Nov 2025 09:01:32 -0000
@@ -189,12 +189,3 @@ openfirmware:
 	mov	%l7, %g7
 	ret
 	 restore	%o0, %g0, %o0
-
-#if 0
-	.data
-	.align 8
-bootstack:	
-#define STACK_SIZE	0x14000
-	.skip	STACK_SIZE
-ebootstack:			! end (top) of boot stack
-#endif