GRUB2 as the ISO boot loader for POWER arch

Currently, yaboot is the ISO boot loader in fedora and the Fedora on
POWER team is making an effort in order to replace it by GRUB2 in the
F20 release cycle. I'm sending a lorax patch so you guys can comment
on it. I'm planning to create a feature page for that too.

This patch only change the lorax template for ppc and should not
affect other archs, like x86.

--
Paulo Flabiano Smorigo
Software Engineer
Linux Technology Center - IBM Systems & Technology Group

lorax.spec

@@ -51,6 +51,8 @@ Requires:       syslinux >= 4.02-5
 
 %ifarch ppc ppc64
 Requires:       kernel-bootwrapper
+Requires:       grub2
+Requires:       grub2-tools
 %endif
 
 %ifarch s390 s390x

share/config_files/ppc/bootinfo.txt

@@ -1,7 +1,8 @@
-<chrp-boot> <description>Linux</description> 
-<os-name>Linux</os-name> 
-<boot-script>boot &device;:\ppc\chrp\yaboot</boot-script> 
-<icon size=64,64 color-space=3,3,2> 
+<chrp-boot>
+<description>grub 2.00</description>
+<os-name>grub 2.00</os-name>
+<boot-script>boot &device;:\boot\grub\powerpc-ieee1275\core.elf</boot-script>
+<icon size=64,64 color-space=3,3,2>
 <bitmap> FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

share/config_files/ppc/grub.cfg.in

@@ -0,0 +1,34 @@
+set default=0
+set timeout=5
+
+echo -e "\nWelcome to the @PRODUCT@ @VERSION@ installer!\n\n"
+
+for BITS in 32 64; do
+  if [ -d "/ppc/ppc${BITS}" ]; then
+    menuentry "Install @PRODUCT@ @VERSION@ (${BITS}-bit kernel)"  $BITS --class fedora --class gnu-linux --class gnu --class os {
+      linux /ppc/ppc${2}/vmlinuz @ROOT@ ro
+      initrd /ppc/ppc${2}/initrd.img
+    }
+
+    menuentry "Test this media & install @PRODUCT@ @VERSION@  (${BITS}-bit kernel)" $BITS --class fedora --class gnu-linux --class  gnu --class os {
+      linux /ppc/ppc${2}/vmlinuz @ROOT@ rd.live.check ro
+      initrd /ppc/ppc${2}/initrd.img
+      }
+
+    menuentry "Rescue a @PRODUCT@ system (${BITS}-bit kernel)" $BITS  --class fedora --class gnu-linux --class gnu --class os {
+      linux /ppc/ppc${2}/vmlinuz @ROOT@ rescue ro
+      initrd /ppc/ppc${2}/initrd.img
+      }
+  fi
+done
+
+submenu 'Other options...' {
+  menuentry 'Reboot' {
+    reboot
+  }
+
+  menuentry 'Exit to Open Firmware' {
+    exit
+  }
+}
+

share/ppc.tmpl

@@ -2,6 +2,7 @@
 <%
 configdir="tmp/config_files/ppc"
 BOOTDIR="ppc"
+GRUBDIR="boot/grub"
 LIVEDIR="LiveOS"
 MACDIR=BOOTDIR+"/mac"
 NETBOOTDIR="images/netboot"
@@ -9,7 +10,6 @@ NETBOOTDIR="images/netboot"
 WRAPPER="usr/sbin/wrapper"
 WRAPPER_DATA="usr/"+libdir+"/kernel-wrapper"
 
-bitsizes = set()
 prepboot = ""
 
 ## NOTE: yaboot freaks out and stops parsing its config if it sees a '\',
@@ -37,13 +37,18 @@ mkdir ${BOOTDIR}
 ## boot stuff for normal (CHRP/PREP) PPC systems
 install ${configdir}/bootinfo.txt ${BOOTDIR}
 install boot/efika.forth ${BOOTDIR}
-mkdir ${BOOTDIR}/chrp
-install usr/lib/yaboot/yaboot ${BOOTDIR}/chrp
-runcmd ${inroot}/usr/lib/yaboot/addnote ${outroot}/${BOOTDIR}/chrp/yaboot
-## special boot dir for PowerMacs
-mkdir ${MACDIR}
-install usr/lib/yaboot/yaboot ${MACDIR}
-install ${configdir}/ofboot.b ${MACDIR}
+
+mkdir ${GRUBDIR}/powerpc-ieee1275
+runcmd grub2-mkimage -O powerpc-ieee1275 -d  /usr/lib/grub/powerpc-ieee1275 -p '()/boot/grub' \
+-o ${outroot}/${GRUBDIR}/powerpc-ieee1275/core.elf iso9660 ext2 ofnet net tftp http
+install /usr/lib/grub/powerpc-ieee1275/*.mod ${GRUBDIR}/powerpc-ieee1275
+install /usr/lib/grub/powerpc-ieee1275/*.lst ${GRUBDIR}/powerpc-ieee1275
+
+
+install ${configdir}/grub.cfg.in     ${GRUBDIR}/grub.cfg
+replace @PRODUCT@ '${product.name}'  ${GRUBDIR}/grub.cfg
+replace @VERSION@ ${product.version} ${GRUBDIR}/grub.cfg
+replace @ROOT@    "${rootarg}"       ${GRUBDIR}/grub.cfg
 
 ## copy mapping and magic files needed for isos
 install ${configdir}/mapping ${BOOTDIR}
@@ -59,7 +64,6 @@ install ${configdir}/magic ${BOOTDIR}
       ## separate dirs/images for each arch
       KERNELDIR=BOOTDIR+"/ppc%s" % bits
       NETIMG=NETBOOTDIR+"/ppc%s.img" % bits
-      bitsizes.add(bits)
     %>
     ## install kernel
     mkdir ${KERNELDIR} ${NETBOOTDIR}
@@ -71,13 +75,6 @@ install ${configdir}/magic ${BOOTDIR}
         installupgradeinitrd images-${kernel.arch} ${kernel.upgrade.path} ${KERNELDIR}/upgrade.img
     %endif
 
-    ## install arch-specific bootloader config
-    install ${configdir}/yaboot.conf.in  ${KERNELDIR}/yaboot.conf
-    replace @BITS@    ${bits}            ${KERNELDIR}/yaboot.conf
-    replace @PRODUCT@ '${product.name}'  ${KERNELDIR}/yaboot.conf
-    replace @VERSION@ ${product.version} ${KERNELDIR}/yaboot.conf
-    replace @ROOT@    "${rootarg}"       ${KERNELDIR}/yaboot.conf
-
     ## kernel-wrapper magic that makes the netboot combined ppc{32,64}.img
     runcmd ${inroot}/${WRAPPER} -p of \
            -D ${inroot}/${WRAPPER_DATA} \
@@ -92,19 +89,6 @@ install ${configdir}/magic ${BOOTDIR}
     %endif
 %endfor
 
-## choose correct yaboot.conf
-mkdir etc
-%if len(bitsizes) == 2:
-    ## both kernels means hybrid - use the magic hybrid config
-    install ${configdir}/yaboot.conf.3264  etc/yaboot.conf
-    replace @PRODUCT@ ${product.name}      etc/yaboot.conf
-    replace @VERSION@ ${product.version}   etc/yaboot.conf
-    replace @ROOT@    "${rootarg}"         etc/yaboot.conf
-%else:
-    ## single arch - use the arch-specific yaboot.conf from above
-    copy ${KERNELDIR}/yaboot.conf etc/yaboot.conf
-%endif
-
 ## make boot.iso
 runcmd mkisofs -o ${outroot}/images/boot.iso -chrp-boot -U \
         ${prepboot} -part -hfs -T -r -l -J \
@@ -113,8 +97,8 @@ runcmd mkisofs -o ${outroot}/images/boot.iso -chrp-boot -U \
         -hfs-volid ${product.version} -hfs-bless ${outroot}/${MACDIR} \
         -map ${inroot}/${configdir}/mapping \
         -no-desktop -allow-multidot -graft-points \
-        etc=${outroot}/etc \
         ${BOOTDIR}=${outroot}/${BOOTDIR} \
+        ${GRUBDIR}=${outroot}/${GRUBDIR} \
         ${NETBOOTDIR}=${outroot}/${NETBOOTDIR} \
         ${LIVEDIR}=${outroot}/${LIVEDIR}