1 files changed, 11 insertions, 7 deletions

diff --git a/Documentation/x86/boot.txt b/Documentation/x86/boot.txt
index 7b4596ac4120..e0203662f9e9 100644
--- a/Documentation/x86/boot.txt
+++ b/Documentation/x86/boot.txt
@@ -158,7 +158,7 @@ Offset	Proto	Name		Meaning
 0202/4  2.00+   header          Magic signature "HdrS"
 0206/2  2.00+   version         Boot protocol version supported
 0208/4  2.00+   realmode_swtch  Boot loader hook (see below)
-020C/2  2.00+   start_sys       The load-low segment (0x1000) (obsolete)
+020C/2  2.00+   start_sys_seg   The load-low segment (0x1000) (obsolete)
 020E/2  2.00+   kernel_version  Pointer to kernel version string
 0210/1  2.00+   type_of_loader  Boot loader identifier
 0211/1  2.00+   loadflags       Boot protocol option flags
@@ -170,10 +170,11 @@ Offset	Proto	Name		Meaning
 0224/2  2.01+   heap_end_ptr    Free memory after setup end
 0226/2  N/A     pad1            Unused
 0228/4  2.02+   cmd_line_ptr    32-bit pointer to the kernel command line
-022C/4  2.03+   initrd_addr_max Highest legal initrd address
+022C/4  2.03+   ramdisk_max     Highest legal initrd address
 0230/4  2.05+   kernel_alignment Physical addr alignment required for kernel
 0234/1  2.05+   relocatable_kernel Whether kernel is relocatable or not
-0235/3  N/A     pad2            Unused
+0235/1  N/A     pad2            Unused
+0236/2  N/A     pad3            Unused
 0238/4  2.06+   cmdline_size    Maximum size of the kernel command line
 023C/4  2.07+   hardware_subarch Hardware subarchitecture
 0240/8  2.07+   hardware_subarch_data Subarchitecture-specific data
@@ -299,14 +300,14 @@ Protocol:	2.00+
   e.g. 0x0204 for version 2.04, and 0x0a11 for a hypothetical version
   10.17.
 
-Field name:     readmode_swtch
+Field name:     realmode_swtch
 Type:           modify (optional)
 Offset/size:    0x208/4
 Protocol:       2.00+
 
   Boot loader hook (see ADVANCED BOOT LOADER HOOKS below.)
 
-Field name:     start_sys
+Field name:     start_sys_seg
 Type:           read
 Offset/size:    0x20c/2
 Protocol:       2.00+
@@ -468,7 +469,7 @@ Protocol:	2.02+
   zero, the kernel will assume that your boot loader does not support
   the 2.02+ protocol.
 
-Field name:     initrd_addr_max
+Field name:     ramdisk_max
 Type:           read
 Offset/size:    0x22c/4
 Protocol:       2.03+
@@ -542,7 +543,10 @@ Protocol:	2.08+
 
   The payload may be compressed. The format of both the compressed and
   uncompressed data should be determined using the standard magic
-  numbers. Currently only gzip compressed ELF is used.
+  numbers.  The currently supported compression formats are gzip
+  (magic numbers 1F 8B or 1F 9E), bzip2 (magic number 42 5A) and LZMA
+  (magic number 5D 00).  The uncompressed payload is currently always ELF
+  (magic number 7F 45 4C 46).
   
 Field name:     payload_length
 Type:           read