System Administration Guide: Basic Administration

x86: GRUB Support for Directly Loading and Booting the unix Kernel

Solaris Express Community Edition, build 57: This release includes changes to the GRUB based boot environment to enable the boot loader to directly load and boot the unix kernel.

Note –

The GRUB multiboot module is no longer used.

This implementation integrates the previous multiboot functionality directly into the platform-specific unix kernel module. These changes reduce the time, as well as memory requirements, that are needed to boot the Solaris OS on x86 based systems.

Two new keywords, kernel$ and module$, have been added to GRUB to assist in creating menu.lst entries that work with either 32-bit or 64-bit systems. In addition, the bootadm command that manages the menu.lst file has been modified to create file entries for the platform-specific unix module that is loaded by GRUB. During an upgrade, the bootadm command converts any existing multiboot menu.lst entries to unix entries.

The kernel$ and module$ keywords are identical to the kernel and module commands that are used in the GRUB multiboot implementation, with the addition of the $ISADIR keyword. This keyword provides the capability to expand to amd64 on 64-bit capable hardware. If the x86 based system is not 64-bit capable, the $ISADIR keyword is a null value (""). In this case, the system boots the 32-bit kernel.

Note –

These changes do not prevent you from booting a newer Solaris kernel with an older implementation of GRUB. Nor do the changes prevent you from booting an older Solaris kernel with a newer implementation of GRUB.

For information about booting an x86 based system with GRUB, see x86: Administering the GRUB Bootloader.