diff -Nura linux-2.4.29/arch/sparc64/kernel/head.S linux-2.4.29-sparc64-ramdisk64-rollback/arch/sparc64/kernel/head.S
--- linux-2.4.29/arch/sparc64/kernel/head.S	2004-11-17 08:54:21.000000000 -0300
+++ linux-2.4.29-sparc64-ramdisk64-rollback/arch/sparc64/kernel/head.S	2005-02-24 18:30:47.000000000 -0300
@@ -50,7 +50,7 @@
  */
         .global root_flags, ram_flags, root_dev
         .global sparc_ramdisk_image, sparc_ramdisk_size
-	.global sparc_ramdisk_image64
+	.globl	silo_args
 
         .ascii  "HdrS"
         .word   LINUX_VERSION_CODE
@@ -61,7 +61,7 @@
 	 * 0x0202 : Supports kernel params string
 	 * 0x0201 : Supports reboot_command
 	 */
-	.half   0x0301          /* HdrS version */
+	.half   0x0300          /* HdrS version */
 
 root_flags:
         .half   1
@@ -75,8 +75,6 @@
         .word   0
         .xword  reboot_command
 	.xword	bootstr_info
-sparc_ramdisk_image64:
-	.xword	0
 	.word	_end
 
 	/* We must be careful, 32-bit OpenBOOT will get confused if it
diff -Nura linux-2.4.29/arch/sparc64/mm/init.c linux-2.4.29-sparc64-ramdisk64-rollback/arch/sparc64/mm/init.c
--- linux-2.4.29/arch/sparc64/mm/init.c	2004-11-17 08:54:21.000000000 -0300
+++ linux-2.4.29-sparc64-ramdisk64-rollback/arch/sparc64/mm/init.c	2005-02-24 18:35:09.000000000 -0300
@@ -63,7 +63,6 @@
 unsigned long mmu_context_bmap[CTX_BMAP_SLOTS];
 
 /* Initial ramdisk setup */
-extern unsigned long sparc_ramdisk_image64;
 extern unsigned int sparc_ramdisk_image;
 extern unsigned int sparc_ramdisk_size;
 
@@ -1252,12 +1251,10 @@
 
 #ifdef CONFIG_BLK_DEV_INITRD
 	/* Now have to check initial ramdisk, so that bootmap does not overwrite it */
-	if (sparc_ramdisk_image || sparc_ramdisk_image64) {
-		unsigned long ramdisk_image = sparc_ramdisk_image ?
-			sparc_ramdisk_image : sparc_ramdisk_image64;
-		if (ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
-			ramdisk_image -= KERNBASE;
-		initrd_start = ramdisk_image + phys_base;
+	if (sparc_ramdisk_image) {
+		if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
+			sparc_ramdisk_image -= KERNBASE;
+		initrd_start = sparc_ramdisk_image + phys_base;
 		initrd_end = initrd_start + sparc_ramdisk_size;
 		if (initrd_end > end_of_phys_memory) {
 			printk(KERN_CRIT "initrd extends beyond end of memory "
@@ -1360,7 +1357,7 @@
 	if ((real_end > ((unsigned long)KERNBASE + 0x400000)))
 		bigkernel = 1;
 #ifdef CONFIG_BLK_DEV_INITRD
-	if (sparc_ramdisk_image || sparc_ramdisk_image64)
+	if (sparc_ramdisk_image)
 		real_end = (PAGE_ALIGN(real_end) + PAGE_ALIGN(sparc_ramdisk_size));
 #endif