Changeset fe2553a

Timestamp:

06/16/2020 12:20:30 AM (3 years ago)

Author:

Ken Moffat <ken@…>

Branches:

10.0, 10.1, 11.0, 11.1, 11.2, 11.3, ken/inkscape-core-mods, lazarus, plabs/python-mods, qt5new, trunk, upgradedb, xry111/intltool, xry111/soup3, xry111/test-20220226

Children:

4e1b891

Parents:

cb704b48

Message:

Microcode - add a Caution for certain Intel machines.

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@23286 af4574ff-66df-0310-9fd7-8a98e5e911e0

Files:

• introduction/welcome/changelog.xml (modified) (1 diff)
• postlfs/config/firmware.xml (modified) (1 diff)

introduction/welcome/changelog.xml

@@ -46 +46 @@
       <itemizedlist>
         <listitem>
+          <para>[ken] - Add a caution in the Intel microcode section, certain
+          Skylake variants fail to boot with the latest firmware.</para>
+        </listitem>
+        <listitem>
           <para>[ken] - Update to mutt-1.14.3 (Security fixes, also now requires
           lynx (or links, with adjustment) to generate manual.txt. Fixes

postlfs/config/firmware.xml

@@ -381 +381 @@
 <screen><userinput>cp -v /lib/firmware/intel-ucode/&lt;XX-YY-ZZ&gt; kernel/x86/microcode/GenuineIntel.bin</userinput></screen>
 
+      <caution>
+        <para>
+          On some Skylake machines with hex Model Number '4e' (78 decimal) the upgrade to
+          microcode version '0xdc' is reported to cause the machine to hang in early boot,
+          and the fix is to revert to version 0xd6 which was shipped in the 20191115
+          microcode release.
+        </para>
+
+        <para>
+          Doing that, while making the machine usable, will mean that the SRBDS
+          mitigations are not present.
+        </para>
+
+        <para>
+          The Skylake machines with hex Model Number '5e' (94 decimal) use similar
+          firmware versions, but boot correctly with the mitigation applied.
+        </para>
+      </caution>
+
       <para>
         Now prepare the initrd: