From 9f6153f21161170971f753ffc9959ceea3c6ad6d Mon Sep 17 00:00:00 2001
From: Philippe Aubertin <39178965+phaubertin@users.noreply.github.com>
Date: Mon, 2 Dec 2024 21:43:03 -0500
Subject: [PATCH] Document "init" command line option (#100)

Document "init" command line option.
---
 doc/cmdline.md | 30 +++++++++++++++++++++---------
 1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/doc/cmdline.md b/doc/cmdline.md
index 300de080..1329e433 100644
--- a/doc/cmdline.md
+++ b/doc/cmdline.md
@@ -39,15 +39,16 @@ For user space environment variables, the behaviour is undefined.
 
 ## Supported Kernel Options
 
-| Name             | Type    | Description                                                  |
-|------------------|---------|--------------------------------------------------------------|
-| on_panic         | string  | Action to take after a kernel panic                          |
-| pae              | string  | Controls whether Physical Address Extension (PAE) is enabled |
-| serial_enable    | boolean | Enable/disable logging on the serial port                    |
-| serial_baud_rate | integer | Baud rate for serial port logging                            |
-| serial_ioport    | integer | I/O port address for serial port logging                     |
-| serial_dev       | string  | Serial port device used for logging                          |
-| vga_enable       | boolean | Enable/disable logging to video (VGA)                        |
+| Name                | Type    | Description                                                  |
+|---------------------|---------|--------------------------------------------------------------|
+| `init`              | string  | Path to initial program in initial RAM disk                  |
+| `on_panic`          | string  | Action to take after a kernel panic                          |
+| `pae`               | string  | Controls whether Physical Address Extension (PAE) is enabled |
+| `serial_enable`     | boolean | Enable/disable logging on the serial port                    |
+| `serial_baud_rate`  | integer | Baud rate for serial port logging                            |
+| `serial_ioport`     | integer | I/O port address for serial port logging                     |
+| `serial_dev`        | string  | Serial port device used for logging                          |
+| `vga_enable`        | boolean | Enable/disable logging to video (VGA)                        |
 
 For boolean options:
 
@@ -59,6 +60,17 @@ Integer option values can be specified as a decimal number without any leading
 zero (e.g. `42` but not `042`) or as an hexadecimal number prepended with `0x`
 (e.g. `0x3f8`).
 
+### Initial Program Path - `init`
+
+Path to initial program in the extracted initial RAM disk.
+
+Type: string
+
+The user space loader loads this executable binary as the initial process. It
+must be an ELF binary.
+
+The default for this option is `/sbin/init`.
+
 ### Kernel Panic Action - `on_panic`
 
 Action to take after a kernel panic.