Add static IP support for RedHat variants

To test, press "m" during boot.

src/centos.ipxe

@@ -3,6 +3,9 @@
 # CentOS Operating System
 # http://www.centos.org
 
+isset ${dhcp-server} && set ipparam ip=dhcp || set ipparam ip=${ip}::${gateway}:${netmask}:::none:${dns}
+set ipparam BOOTIF=${netX/mac} ${ipparam}
+
 goto ${menu} ||
 
 :centos
@@ -56,7 +59,7 @@ goto boottype
 
 :bootos_images
 imgfree
-kernel http://${centos_mirror}/${dir}/images/pxeboot/vmlinuz repo=${repo} ${params} ${console} BOOTIF=${netX/mac} ip=dhcp initrd=initrd.img
+kernel http://${centos_mirror}/${dir}/images/pxeboot/vmlinuz repo=${repo} ${params} ${console} ${ipparam} initrd=initrd.img
 initrd http://${centos_mirror}/${dir}/images/pxeboot/initrd.img
 echo
 echo MD5sums:

src/fedora.ipxe

@@ -3,6 +3,9 @@
 # Fedora Operating System
 # https://getfedora.org/
 
+isset ${dhcp-server} && set ipparam ip=dhcp || set ipparam ip=${ip}::${gateway}:${netmask}:::none:${dns}
+set ipparam BOOTIF=${netX/mac} ${ipparam}
+
 goto ${menu} ||
 
 :fedora
@@ -54,7 +57,7 @@ goto boot
 
 :boot
 imgfree
-kernel http://${fedora_mirror}/${dir}/images/pxeboot/vmlinuz repo=http://${fedora_mirror}/${dir} ${params} ${console} BOOTIF=${netX/mac} ip=dhcp initrd=initrd.img
+kernel http://${fedora_mirror}/${dir}/images/pxeboot/vmlinuz repo=http://${fedora_mirror}/${dir} ${params} ${console} ${ipparam} initrd=initrd.img
 initrd http://${fedora_mirror}/${dir}/images/pxeboot/initrd.img
 echo
 echo MD5sums:

src/rhel.ipxe

@@ -3,6 +3,9 @@
 # Redhat Enterprise Linux (RHEL)
 # https://www.redhat.com
 
+isset ${dhcp-server} && set ipparam ip=dhcp || set ipparam ip=${ip}::${gateway}:${netmask}:::none:${dns}
+set ipparam BOOTIF=${netX/mac} ${ipparam}
+
 set rhel_arch x86_64
 goto ${menu} ||
 
@@ -40,7 +43,7 @@ isset ${rhel_base_url} && goto boot || echo URL not set... && goto url_set
 
 :boot
 imgfree
-kernel ${rhel_base_url}/os/${rhel_arch}/images/pxeboot/vmlinuz repo=${rhel_base_url}/os/${rhel_arch} ${console} BOOTIF=${netX/mac} ip=dhcp initrd=initrd.img
+kernel ${rhel_base_url}/os/${rhel_arch}/images/pxeboot/vmlinuz repo=${rhel_base_url}/os/${rhel_arch} ${console} ${ipparam} initrd=initrd.img
 initrd ${rhel_base_url}/os/${rhel_arch}/images/pxeboot/initrd.img
 md5sum vmlinuz initrd.img
 boot

src/scientific.ipxe

@@ -3,6 +3,9 @@
 # Scientific Linux Operating System
 # https://www.scientificlinux.org/
 
+isset ${dhcp-server} && set ipparam ip=dhcp || set ipparam ip=${ip}::${gateway}:${netmask}:::none:${dns}
+set ipparam BOOTIF=${netX/mac} ${ipparam}
+
 goto ${menu} ||
 
 :scientific
@@ -47,7 +50,7 @@ goto bootos_images
 
 :bootos_images
 imgfree
-kernel http://ftp1.scientificlinux.org/${dir}/images/pxeboot/vmlinuz repo=${repo} ${params} ${netcfg} ${console}
+kernel http://ftp1.scientificlinux.org/${dir}/images/pxeboot/vmlinuz repo=${repo} ${params} ${netcfg} ${console} ${ipparam}
 initrd http://ftp1.scientificlinux.org/${dir}/images/pxeboot/initrd.img
 boot
 goto linux_menu