1 files changed, 9 insertions, 20 deletions

diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
index 7ccff4884a23..5d84d1c74e4c 100644
--- a/arch/x86/boot/header.S
+++ b/arch/x86/boot/header.S
@@ -24,12 +24,8 @@
 #include "boot.h"
 #include "offsets.h"
 
-SETUPSECTS      = 4                     /* default nr of setup-sectors */
 BOOTSEG         = 0x07C0                /* original address of boot-sector */
-SYSSEG          = DEF_SYSSEG            /* system loaded at 0x10000 (65536) */
-SYSSIZE         = DEF_SYSSIZE           /* system size: # of 16-byte clicks */
-                                        /* to be loaded */
-ROOT_DEV        = 0                     /* ROOT_DEV is now written by "build" */
+SYSSEG          = 0x1000                /* historical load address >> 4 */
 
 #ifndef SVGA_MODE
 #define SVGA_MODE ASK_VGA
@@ -97,12 +93,12 @@ bugger_off_msg:
         .section ".header", "a"
         .globl  hdr
 hdr:
-setup_sects:    .byte SETUPSECTS
+setup_sects:    .byte 0                 /* Filled in by build.c */
 root_flags:     .word ROOT_RDONLY
-syssize:        .long SYSSIZE
-ram_size:       .word RAMDISK
+syssize:        .long 0                 /* Filled in by build.c */
+ram_size:       .word 0                 /* Obsolete */
 vid_mode:       .word SVGA_MODE
-root_dev:       .word ROOT_DEV
+root_dev:       .word 0                 /* Filled in by build.c */
 boot_flag:      .word 0xAA55
 
         # offset 512, entry point
@@ -123,14 +119,15 @@ _start:
                                         # or else old loadlin-1.5 will fail)
                 .globl realmode_swtch
 realmode_swtch: .word   0, 0            # default_switch, SETUPSEG
-start_sys_seg:  .word   SYSSEG
+start_sys_seg:  .word   SYSSEG          # obsolete and meaningless, but just
+                                        # in case something decided to "use" it
                 .word   kernel_version-512 # pointing to kernel version string
                                         # above section of header is compatible
                                         # with loadlin-1.5 (header v1.5). Don't
                                         # change it.
 
-type_of_loader: .byte   0               # = 0, old one (LILO, Loadlin,
-                                        #      Bootlin, SYSLX, bootsect...)
+type_of_loader: .byte   0               # 0 means ancient bootloader, newer
+                                        # bootloaders know to change this.
                                         # See Documentation/i386/boot.txt for
                                         # assigned ids
 
@@ -142,11 +139,7 @@ CAN_USE_HEAP	= 0x80			# If set, the loader also has set
                                         # space behind setup.S can be used for
                                         # heap purposes.
                                         # Only the loader knows what is free
-#ifndef __BIG_KERNEL__
-                .byte   0
-#else
                 .byte   LOADED_HIGH
-#endif
 
 setup_move_size: .word  0x8000          # size to move, when setup is not
                                         # loaded at 0x90000. We will move setup
@@ -157,11 +150,7 @@ setup_move_size: .word  0x8000		# size to move, when setup is not
 
 code32_start:                           # here loaders can put a different
                                         # start address for 32-bit code.
-#ifndef __BIG_KERNEL__
-                .long   0x1000          #   0x1000 = default for zImage
-#else
                 .long   0x100000        # 0x100000 = default for big kernel
-#endif
 
 ramdisk_image:  .long   0               # address of loaded ramdisk image
                                         # Here the loader puts the 32-bit