1 files changed, 54 insertions, 0 deletions

diff --git a/Documentation/i386/boot.txt b/Documentation/i386/boot.txt
index fc49b79bc1ab..0fac3465f2e3 100644
--- a/Documentation/i386/boot.txt
+++ b/Documentation/i386/boot.txt
@@ -42,6 +42,8 @@ Protocol 2.05:	(Kernel 2.6.20) Make protected mode kernel relocatable.
 Protocol 2.06:  (Kernel 2.6.22) Added a field that contains the size of
                 the boot command line
 
+Protocol 2.09:  (kernel 2.6.26) Added a field of 64-bit physical
+                pointer to single linked list of struct setup_data.
 
 **** MEMORY LAYOUT
 
@@ -170,6 +172,10 @@ Offset	Proto	Name		Meaning
 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
+0248/4  2.08+   payload_offset  Offset of kernel payload
+024C/4  2.08+   payload_length  Length of kernel payload
+0250/8  2.09+   setup_data      64-bit physical pointer to linked list
+                                of struct setup_data
 
 (1) For backwards compatibility, if the setup_sects field contains 0, the
     real value is 4.
@@ -512,6 +518,32 @@ Protocol:	2.07+
 
   A pointer to data that is specific to hardware subarch
 
+Field name:     payload_offset
+Type:           read
+Offset/size:    0x248/4
+Protocol:       2.08+
+
+  If non-zero then this field contains the offset from the end of the
+  real-mode code to the payload.
+
+  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.
+  
+Field name:     payload_length
+Type:           read
+Offset/size:    0x24c/4
+Protocol:       2.08+
+
+  The length of the payload.
+
+**** THE IMAGE CHECKSUM
+
+From boot protocol version 2.08 onwards the CRC-32 is calculated over
+the entire file using the characteristic polynomial 0x04C11DB7 and an
+initial remainder of 0xffffffff.  The checksum is appended to the
+file; therefore the CRC of the file up to the limit specified in the
+syssize field of the header is always 0.
 
 **** THE KERNEL COMMAND LINE
 
@@ -544,6 +576,28 @@ command line is entered using the following protocol:
         covered by setup_move_size, so you may need to adjust this
         field.
 
+Field name:     setup_data
+Type:           write (obligatory)
+Offset/size:    0x250/8
+Protocol:       2.09+
+
+  The 64-bit physical pointer to NULL terminated single linked list of
+  struct setup_data. This is used to define a more extensible boot
+  parameters passing mechanism. The definition of struct setup_data is
+  as follow:
+
+  struct setup_data {
+          u64 next;
+          u32 type;
+          u32 len;
+          u8  data[0];
+  };
+
+  Where, the next is a 64-bit physical pointer to the next node of
+  linked list, the next field of the last node is 0; the type is used
+  to identify the contents of data; the len is the length of data
+  field; the data holds the real payload.
+
 
 **** MEMORY LAYOUT OF THE REAL-MODE CODE