syslinux.txt: update; add INITRD

Add the INITRD statement and a few other updates.

diff --git a/doc/syslinux.txt b/doc/syslinux.txt
index dc82f2a..54be427 100644 (file)
--- a/doc/syslinux.txt
+++ b/doc/syslinux.txt
@@ -179,9 +179,9 @@ IPAPPEND flag_val                   [PXELINUX only]
        interface the system booted.
 
 LABEL label
-  KERNEL image
-  APPEND options...
-  IPAPPEND flag_val                    [PXELINUX only]
+    KERNEL image
+    APPEND options...
+    IPAPPEND flag_val                  [PXELINUX only]
        Indicates that if "label" is entered as the kernel to boot,
         SYSLINUX should instead boot "image", and the specified APPEND
        and IPAPPEND options should be used instead of the ones
@@ -190,11 +190,8 @@ LABEL label
         "label", and if no APPEND is given the default is to use the
         global entry (if any).
 
-       Starting with version 2.20, LABEL statements are compressed
-       internally, therefore the maximum number of LABEL statements
-       depends on their complexity.  Typical is around 600.  SYSLINUX
-       will print an error message if the internal memory for labels
-       is overrun.
+       Starting with version 3.62, the number of LABEL statements is
+       virtually unlimited.
 
         Note that LILO uses the syntax:
         image = mykernel
@@ -212,25 +209,27 @@ LABEL label
        Since version 3.32 label names are no longer mangled into DOS
        format (for SYSLINUX.)
 
-  LINUX image                  - Linux kernel image (default)
-  BOOT image                   - Bootstrap program (.bs, .bin)
-  BSS image                    - BSS image (.bss)
-  PXE image                    - PXE Network Bootstrap Program (.0)
-  FDIMAGE image                        - Floppy disk image (.img)
-  COMBOOT image                        - COMBOOT program (.com, .cbt)
-  COM32 image                  - COM32 program (.c32)
-  CONFIG image                 - New configuration file
+    The following commands are available after a LABEL statement:
+
+    LINUX image                        - Linux kernel image (default)
+    BOOT image                 - Bootstrap program (.bs, .bin)
+    BSS image                  - BSS image (.bss)
+    PXE image                  - PXE Network Bootstrap Program (.0)
+    FDIMAGE image              - Floppy disk image (.img)
+    COMBOOT image              - COMBOOT program (.com, .cbt)
+    COM32 image                        - COM32 program (.c32)
+    CONFIG image               - New configuration file
        Using one of these keywords instead of KERNEL forces the
        filetype, regardless of the filename.
 
        CONFIG means restart the boot loader using a different
        configuration file.
 
-  APPEND -
+    APPEND -
         Append nothing.  APPEND with a single hyphen as argument in a
         LABEL section can be used to override a global APPEND.
 
-  LOCALBOOT type                       [ISOLINUX, PXELINUX]
+    LOCALBOOT type                     [ISOLINUX, PXELINUX]
        On PXELINUX, specifying "LOCALBOOT 0" instead of a "KERNEL"
        option means invoking this particular label will cause a local
        disk boot instead of booting a kernel.
@@ -251,6 +250,12 @@ LABEL label
        mean that the next boot device in the boot sequence should be
        activated.
 
+    INITRD initrd_file
+       Starting with version 3.71, an initrd can be specified in a
+       separate statement (INITRD) instead of as part of the APPEND
+       statement; this functionally appends "initrd=initrd_file" to
+       the kernel command line.
+
 IMPLICIT flag_val
         If flag_val is 0, do not load a kernel image unless it has been
         explicitly named in a LABEL statement.  The default is 1.