Author: bdubbs Date: Sun Jan 8 09:45:12 2017 New Revision: 11165 Log: Expand discussion of UEFI in kernel and grub sections
Modified: trunk/BOOK/chapter08/grub.xml trunk/BOOK/chapter08/kernel.xml Modified: trunk/BOOK/chapter08/grub.xml ============================================================================== --- trunk/BOOK/chapter08/grub.xml Sun Jan 8 09:07:39 2017 (r11164) +++ trunk/BOOK/chapter08/grub.xml Sun Jan 8 09:45:12 2017 (r11165) @@ -38,15 +38,18 @@ grub-mkrescue --output=grub-img.iso xorriso -as cdrecord -v dev=/dev/cdrw blank=as_needed grub-img.iso</userinput></screen> - <note><para>Most newer systems now come with system firmware that is in - UEFI (Unified Extensible Firmware Interface) mode by default. To boot LFS - on these systems using the instructions here, the UEFI Mode and Secure Boot - capabilities need to be turned off. There are ways to boot with these - capabilities still enabled, but then are not covered here. For details, - see <ulink - url="http://www.linuxfromscratch.org/hints/downloads/files/lfs-uefi.txt";> - the lfs-uefi.txt hint</ulink> at - http://www.linuxfromscratch.org/hints/downloads/files/lfs-uefi.txt.</para></note> + <note> + <para> + To boot LFS on host systems that have UEFI enabled, the kernel needs to + have been built with the CONFIG_EFI_STUB capabality described in the + previous section. However, LFS can be booted using GRUB2 without such + an addition. To do this, the UEFI Mode and Secure Boot capabilities in + the host system's BIOS need to be turned off. For details, see <ulink + url="http://www.linuxfromscratch.org/hints/downloads/files/lfs-uefi.txt";> + the lfs-uefi.txt hint</ulink> at + http://www.linuxfromscratch.org/hints/downloads/files/lfs-uefi.txt. + </para> + </note> </sect2> Modified: trunk/BOOK/chapter08/kernel.xml ============================================================================== --- trunk/BOOK/chapter08/kernel.xml Sun Jan 8 09:07:39 2017 (r11164) +++ trunk/BOOK/chapter08/kernel.xml Sun Jan 8 09:45:12 2017 (r11165) @@ -121,6 +121,24 @@ Index of Kernel Settings</ulink> (&lfs-root;blfs/view/&short-version;/longindex.html#kernel-config-index).</para> + <note> + <para>If your host hardware is using UEFI, then the 'make defconfig' + above should automatically add in some EFI-related kernel options.</para> + + <para>In order to allow your LFS kernel to be booted from within your + host's UEFI boot environment, your kernel must have this option + selected:</para> + +<screen role="nodump">Processor type and features ---> + [*] EFI stub support [CONFIG_EFI_STUB]</screen> + + <para>A fuller description of managing UEFI environments from within LFS + is covered by the lfs-uefi.txt hint at + <ulink + url="http://www.linuxfromscratch.org/hints/downloads/files/lfs-uefi.txt"/>. + </para> + </note> + <variablelist> <title>The rationale for the above configuration items:</title> -- http://lists.linuxfromscratch.org/listinfo/lfs-book FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page
