User:Matoro/SPARCbootloader

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GRUB2

If you selected a 64-bit profile during installation, then GRUB2 is the only supported bootloader.

Emerge

GRUB should be correctly configured for your platform automatically based on your profile. If you would like to make it explicit, however, you may specify it so:

root #echo 'GRUB_PLATFORMS="ieee1275"' >> /etc/portage/make.conf
root #emerge --ask --verbose sys-boot/grub:2

The GRUB2 software has now been merged to the system, but not yet installed.

Install

If you partitioned your disk using GPT (the preferred method), then you can safely install GRUB to your BIOS boot partition. Presuming the first disk (the one where the system boots from) is /dev/sda, the following commands will do:

root #grub-install --target=sparc64-ieee1275 --recheck /dev/sda
Tip
To find the boot device string to enter in the firmware, use the grub-ofpathname tool. If your BIOS boot partition is the first partition on the disk, select the entire disk:
root #grub-ofpathname /dev/sda
Otherwise, explicitly select the BIOS boot partition:
root #grub-ofpathname /dev/sda2

If you partitioned your disk using a Sun partition table instead, you must install GRUB using blocklists. In this mode, instead of providing the physical disk as an argument, you should provide the path to the partition on which /boot/grub is mounted.

root #grub-install --target-sparc64-ieee1275 --recheck --force --skip-fs-probe /dev/sda1

Configure

Next, generate the GRUB2 configuration based on the user configuration specified in the /etc/default/grub file and /etc/grub.d scripts. In most cases, no configuration is needed by users as GRUB2 will automatically detect which kernel to boot (the highest one available in /boot/) and what the root file system is. It is also possible to append kernel parameters in /etc/default/grub using the GRUB_CMDLINE_LINUX variable.

To generate the final GRUB2 configuration, run the grub-mkconfig command:

root #grub-mkconfig -o /boot/grub/grub.cfg
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-
Found initrd image: /boot/initramfs-genkernel--
done

The output of the command must mention that at least one Linux image is found, as those are needed to boot the system. If an initramfs is used or genkernel was used to build the kernel, the correct initrd image should be detected as well. If this is not the case, go to /boot/ and check the contents using the ls command. If the files are indeed missing, go back to the kernel configuration and installation instructions.

SILO, the SPARC bootloader

Now install and configure SILO, the Sparc Improved boot LOader.

root #emerge --ask sys-boot/silo

Next create /etc/silo.conf:

root #nano -w /etc/silo.conf

Below an example silo.conf file is shown. It uses the partitioning scheme we use throughout this book, kernel- as kernel image and initramfs-genkernel-sparc64- as initramfs.

FILE /etc/silo.confExample configuration file
partition = 1         # Boot partition (= root partition)
root =       # Root partition
timeout = 150         # Wait 15 seconds before booting the default section
  
image = /boot/kernel-
  label = linux
  append = "initrd=/boot/initramfs-genkernel-sparc64- root="

When using the example silo.conf file as delivered by Portage, be sure to comment out all lines that aren't needed.

If the physical disk on which to install SILO (as bootloader) differs from the physical disk on which /etc/silo.conf resides, then first copy over /etc/silo.conf to a partition on that disk. If /boot/ is a separate partition on that disk, copy over the configuration file to /boot/ and run /sbin/silo:

root #cp /etc/silo.conf /boot
root #/sbin/silo -C /boot/silo.conf
/boot/silo.conf appears to be valid

Otherwise just run /sbin/silo:

root #/sbin/silo
/etc/silo.conf appears to be valid
Note
Run silo (with parameters if necessary) again each time after updating or installing the sys-boot/silo package.