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Expand discussion of UEFI in kernel and grub sections

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git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11165 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
This commit is contained in:
Bruce Dubbs 2017-01-08 17:45:12 +00:00
parent 6bc94ca247
commit 8e65a6a3ae
2 changed files with 30 additions and 9 deletions
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21
chapter08/grub.xml
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@ -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>

18
chapter08/kernel.xml
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@ -121,6 +121,24 @@ File systems ---&gt;
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 ---&gt;
[*] 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>