Update README.md

Author: deepseagirl

README.md

@@ -1,2 +1,111 @@
-# easylkb
-easylkb - Easy Linux Kernel Builder
+# easylkb - Easy Linux Kernel Builder 
+
+easylkb is a simple script designed to make Linux Kernel Debugging easier and more accessible.
+
+## How do you install easylkb?
+
+easylkb is best run on a bare metal Linux system. You need the following things installed in order to use it:
+
+- python3
+- curl
+- gcc
+- make
+- qemu
+
+You can clone this repo and run from the easylkb directory, or you can install with pip (not yet lol). 
+
+```
+pip install easylkb
+```
+
+## How do you use easylkb?
+
+Build a specific mainline kernel version:
+
+```
+easylkb -k 6.2
+```
+
+Build some other kernel in a directory:
+```
+easylkb -p path/to/linux/
+```
+
+Command line flags are tied to specific parts of the build process.
+
+To (d)ownload, (c)onfigure, and co(m)pile a kernel
+```
+easylkb -k 6.2 -dcm
+```
+
+To build a Debian (i)mage from this kernel
+```
+easylkb -k 6.2 -i
+```
+
+To (r)un the generated image:
+```
+easylkb -k 6.2 -r
+```
+
+Combine all of these steps into one:
+```
+easylkb -k 6.2 -a
+```
+
+When it's running, it will run qemu with the Debian image and expose ssh and GDB debugging features accessible via localhost.
+
+## How Do I Interact With The Image?
+
+The image, keys, and run script are stored in the img/ directory within the kernel source.
+
+You can ssh into your image like so:
+```
+ssh root@localhost -p 10021 -i ~/kernel/linux-6.2/img/bullseye.id_rsa
+```
+
+The default login for the resulting image is the user "root" with no password.
+
+This is an example ssh config entry for the resulting image, which you can add to your `~/.ssh/config` file.
+```
+Host linux62
+  HostName localhost
+  User root
+  Port 10021
+  IdentityFile ~/kernel/linux-6.2/img/bullseye.id_rsa
+  StrictHostKeyChecking no
+```
+
+Now you can ssh into your kernel by doing:
+```
+ssh linux62
+```
+
+You can scp files by doing
+```
+scp myfile.bin linux62:
+```
+
+## Kernel Debugging
+
+To debug the kernel, you need `$KERNEL_DIR/scripts/gdb/vmlinux-gdb.py`
+
+Add this to your `~/.gdbinit` file if you want to debug this kernel, changing the path to the kernel source you're working with.
+```
+add-auto-load-safe-path /home/user/kernel/linux-6.2/scripts/gdb/vmlinux-gdb.py
+```
+
+Now to debug just do
+```
+cd /path/to/your/kernel/
+gdb ./vmlinux
+```
+Once you're in gdb just do this:
+```
+(gdb) lx-symbols
+(gdb) target remote :1234
+```
+Wow! You're debugging the kernel you just built, pretty neat.
+
+For more info on kernel debugging with gdb:
+- https://docs.kernel.org/dev-tools/gdb-kernel-debugging.html