[archiso] README update

* Added boot parameters.
* Reorder and clarify build steps.

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>

README

 INDEX
 -----
 
+* Boot parameters (initramfs stage)
+  * hooks/archiso
+  * hooks/archiso_pxe_nbd
+  * hooks/archiso_loop_mnt
+* Boot parameters (only for configs/releng)
+  * etc/rc.conf
 * Image types generated by mkarchiso.
 * File format for aitab.
 * Why the /isolinux and /arch/boot/syslinux directories?
@@ -9,6 +15,78 @@ INDEX
 
 
 
+*** Boot parameters (initramfs stage)
+
+** hooks/archiso
+
+* archisolabel=     Set the filesystem label where archiso files reside.
+                    Default: (unset)
+* archisodevice=    Set the device node where archiso medium is located.
+                    Default: "/dev/disk/by-label/${archisolabel}"
+* archisobasedir=   Set the base directory where all files reside.
+                    Default: "arch"
+* aitab=            Set the path for "aitab" file.
+                    Default: ${archisobasedir}/aitab
+* copytoram=        If set to "y" or just "copytoram" without arguments,
+                    all SquashFS are copied to "RAM".
+                    Default: (unset)
+* cowspace_size=    Set the size of tmpfs /cowspace. This space is used for
+                    Copy-On-Write files of dm-snapshot.
+                    (directory not visible outside initramfs)
+                    Size is in bytes (suffix with "k", "m" and "g") or
+                    in percentage of available RAM.
+                    Default: "75%"
+* copytoram_size=   Set the size of tmpfs /cowpytoram. This space is used for
+                    copy of all SquashFS images used, if copytoram=y.
+                    (directory not visible outside initramfs)
+                    Size is in bytes (suffix with "k", "m" and "g") or
+                    in percentage of available RAM.
+                    Default: "75%"
+* arch=             Force an architecture type (i686 | x86_64).
+                    Do not set it for normal operations.
+                    Useful for running a 64 bit kernel / 32 bit userspace.
+                    Default: (architecture of running kernel)
+
+
+** hooks/archiso_pxe_nbd
+
+* ip=               This parameter is setup automatically by PXELINUX
+                    when option "IPAPPEND" is set to 1 or 2 in config.
+                    ip=<client-ip>:<boot-server-ip>:<gw-ip>:<netmask>
+                    Default: (set via PXE server)
+* BOOTIF=           This parameter is setup automatically by PXELINUX
+                    when option "IPAPPEND" is set to 2 or 3 in config.
+                    BOOTIF=<hardware-address-of-boot-interface>
+                    Default: (set via PXELINUX)
+
+
+** hooks/archiso_loop_mnt
+
+* img_dev=          Device where archiso-image.iso reside.
+                    Default: (unset)
+* img_loop=         Full path where archiso-image.iso is located on ${img_dev}
+                    Default: (unset)
+
+
+
+*** Boot parameters (only for configs/releng)
+
+** /etc/rc.conf
+
+By default these parameters are set by default to these values
+if nothing is specified on command line.
+
+* locale=             "en_US.UTF-8"
+* daemon_locale=      "no"
+* hardwareclock=      "UTC"
+* timezone=           "Canada/Pacific"
+* keymap=             "us"
+* consolefont=        (unset)
+* consolemap=         (unset)
+* usecolor=           "yes"
+
+
+
 *** Image types generated by mkarchiso.
 
 * image-name.sfs     SquashFS image with all files directly on it.
@@ -60,35 +138,34 @@ When make your custom boot-pendrive, you need to copy /arch directory to it.
 
 *** Building the most basic Arch Linux live media. (configs/baseline)
 
-* First install devtools if needed, mkarchroot needs it.
-  [host] # pacman -S devtools
+* Install devtools if needed, mkarchroot needs it
+  [host] # pacman -S devtools --needed
 
-* Create a chroot to work on it.
+* Create a base chroot to work on it.
   (prefix with linux32 if you want to build a 32 bits enviroment under 64 bits)
   [host] # mkarchroot /tmp/chroot base
 
-* Enter it. (prefix with linux32 if needed).
+* Install archiso on chroot (needs git and make)
+  [host] # pacman -S git make --needed
+  [host] # git clone git://projects.archlinux.org/archiso.git
+  [host] # make -C archiso/archiso DESTDIR=/tmp/chroot install
+
+* Enter to chroot (prefix with linux32 if needed).
   [host] # mkarchroot -r bash /tmp/chroot
 
 * Create a loopback device.
-  (mkarchiso does not create it, use other number if not available)
+  (mkarchroot does not create it, use other number if not available)
   [chroot] # mknod /dev/loop0 b 7 0
 
 * Setup a mirror.
   [chroot] # echo 'Server = MIRROR/archlinux/$repo/os/$arch' >> /etc/pacman.d/mirrorlist
 
 * Install aditional packages needed for mkarchiso.
-  (git is only needed to get a copy of archiso.git)
-  [chroot] # pacman -S git squashfs-tools syslinux devtools cdrkit make
-
-* Install archiso.
-  [chroot] # cd /tmp
-  [chroot] # git clone git://projects.archlinux.org/archiso.git
-  [chroot] # cd archiso/archiso
-  [chroot] # make install-program
+  [chroot] # pacman -S devtools squashfs-tools syslinux cdrkit
 
 * Build a basic iso.
-  [chroot] # cd /tmp/archiso/configs/baseline
+  [chroot] # cp -r /usr/share/archiso/configs/baseline /tmp
+  [chroot] # cd /tmp/baseline
   [chroot] # ./build.sh
 
 * Exit from chroot.
@@ -105,52 +182,51 @@ Note: These steps should be done with 64 bits support.
 
 * Prepare a 32 bit chroot enviroment.
 
-linux32 mkarchroot /tmp/chroot32 base
-linux32 mkarchroot -r bash /tmp/chroot32
-echo 'Server = MIRROR/archlinux/$repo/os/$arch' >> /etc/pacman.d/mirrorlist
-pacman -S squashfs-tools syslinux devtools cdrkit make mkinitcpio-nfs-utils nbd --noconfirm --needed
-exit
+  [host64] # linux32 mkarchroot /tmp/chroot32 base
+  [host64] # linux32 mkarchroot -r bash /tmp/chroot32
+  [chroot32] # echo 'Server = MIRROR/archlinux/$repo/os/$arch' >> /etc/pacman.d/mirrorlist
+  [chroot32] # pacman -S devtools squashfs-tools syslinux cdrkit mkinitcpio-nfs-utils nbd
+  [chroot32] # exit
 
 * Prepare a 64 bits chroot enviroment.
 
-mkarchroot /tmp/chroot64 base
-mkarchroot -r bash /tmp/chroot64
-echo 'Server = MIRROR/archlinux/$repo/os/$arch' >> /etc/pacman.d/mirrorlist
-pacman -S squashfs-tools syslinux devtools cdrkit make mkinitcpio-nfs-utils nbd --noconfirm --needed
-exit
-
-* Create a shared directory which archiso can access from both chroot enviroments.
-
-mkdir /tmp/shared
-cd /tmp/shared
-git clone git://github.com/djgera/archiso.git -b dm-snapshot
-cd
-mount --bind /tmp/shared /tmp/chroot32/tmp
-mount --bind /tmp/shared /tmp/chroot64/tmp
-
-* Enter 32 bits chroot enviroment, install mkarchiso,
-  then build core and netinstall single images.
-
-linux32 mkarchroot -r bash /tmp/chroot32
-mknod /dev/loop1032 b 7 1032
-cd /tmp/archiso/archiso
-make install-program
-cd ../configs/releng/
-./build.sh all_iso_single
-
-* Enter 64 bits chroot enviroment, install mkarchiso,
-  then build core and netinstall single images.
-
-mkarchroot -r bash /tmp/chroot64
-mknod /dev/loop1064 b 7 1064
-cd /tmp/archiso/archiso
-make install-program
-cd ../configs/releng/
-./build.sh all_iso_single
-
-* Finally build core and netinstall dual images
-  from any of the chroot enviroments. (The final result is the same).
-
-mkarchroot -r bash /tmp/chroot64
-cd /tmp/archiso/configs/releng/
-./build.sh all_iso_dual
+  [host64] # mkarchroot /tmp/chroot64 base
+  [host64] # mkarchroot -r bash /tmp/chroot64
+  [chroot64] # echo 'Server = MIRROR/archlinux/$repo/os/$arch' >> /etc/pacman.d/mirrorlist
+  [chroot64] # pacman -S devtools squashfs-tools syslinux cdrkit mkinitcpio-nfs-utils nbd
+  [chroot64] # exit
+
+* Install archiso on both chroots.
+
+  [host64] # git clone git://projects.archlinux.org/archiso.git
+  [host64] # make -C archiso/archiso DESTDIR=/tmp/chroot32 install
+  [host64] # make -C archiso/archiso DESTDIR=/tmp/chroot64 install
+
+* Create a shared /tmp directory between two chroots for working.
+
+  [host64] # mkdir /tmp/shared
+  [host64] # chmod 1777 /tmp/shared
+  [host64] # mount --bind /tmp/shared /tmp/chroot32/tmp
+  [host64] # mount --bind /tmp/shared /tmp/chroot64/tmp
+
+* Enter 32 bits chroot enviroment then build core and netinstall single images.
+
+  [chroot32] # linux32 mkarchroot -r bash /tmp/chroot32
+  [chroot32] # mknod /dev/loop1032 b 7 1032 #assumed loop.max_part=0 (by default)
+  [chroot32] # cp -r /usr/share/archiso/configs/releng /tmp
+  [chroot32] # cd /tmp/releng
+  [chroot32] # ./build.sh all_iso_single
+
+* Enter 64 bits chroot enviroment then build core and netinstall single images.
+
+  [chroot64] # mkarchroot -r bash /tmp/chroot64
+  [chroot64] # mknod /dev/loop1064 b 7 1064 #assumed loop.max_part=0 (by default)
+  [chroot64] # cp -r /usr/share/archiso/configs/releng /tmp
+  [chroot64] # cd /tmp/releng
+  [chroot64] # ./build.sh all_iso_single
+
+* Build core and netinstall dual images from any of the chroot enviroments.
+
+  [host64] mkarchroot -r bash /tmp/chroot64
+  [chroot64] # cd /tmp/releng
+  [chroot64] # ./build.sh all_iso_dual