mips64el: Revert drm-panic changes (for now?)

This reverts commits:
- 858a1409f0
- 79648bf770
- 5ee35073fb
- 2349341e3e
- fdf21dccba

MIPS hardware does not have system framebuffer, thus the rationale of
drm-panic changes does not apply.

I don't know if they can be added back in the future or not.

chapter10/kernel.xml

@@ -255,71 +255,6 @@
         </listitem>
       </varlistentry>
 
-      <varlistentry>
-        <term>
-          <parameter>
-            Display a user-friendly message when a kernel panic occurs
-          </parameter>
-        </term>
-        <listitem>
-          <para>This will make the kernel correctly display the message
-          in case a kernel panic happens and a running DRM driver
-          supports to do so.  Without this, it would be more
-          difficult to diagnose a panic: if no DRM driver is running,
-          we'd be on the VGA console which can only hold 24 lines and
-          the relevant kernel message is often flushed away; if a DRM
-          driver is running, the display is often completely messed up
-          on panic.  As of Linux-6.12, none of the dedicated drivers for
-          mainstream GPU models really supports this, but it's supported by
-          the <quote>Simple framebuffer driver</quote> which runs on the
-          VESA (or EFI) framebuffer before the dedicated GPU driver is
-          loaded.  If the dedicated GPU driver is built as a module
-          (instead of a part of the kernel image) and no initramfs is
-          used, this functionality will work just fine before the root
-          file system is mounted and it's already enough for providing
-          information about most LFS configuration errors causing a
-          panic (for example, an incorrect <parameter>root=</parameter>
-          setting in the kernel command line).</para>
-        </listitem>
-      </varlistentry>
-
-      <varlistentry>
-        <term>
-          <parameter>
-            Panic screen formatter
-          </parameter>
-        </term>
-        <listitem>
-          <para>Set this <literal>kmsg</literal> to make sure the last
-          kernel messages lines are displayed when a kernel panic happens.
-          The default, <literal>user</literal>, would make the kernel show
-          only a <quote>user friendly</quote> panic message which is not
-          helpful on diagnostic.  The third choice,
-          <literal>qr_code</literal>, would make the kernel to compress
-          the last kernel message lines into a QR code and display it.
-          The QR code can hold more message lines than plain text and it
-          can be decoded with an external device (like a smart phone).
-          But it requires a Rust compiler that LFS does not provide.</para>
-        </listitem>
-      </varlistentry>
-
-      <varlistentry>
-        <term>
-          <parameter>
-            Mark VGA/VBE/EFI FB as generic system framebuffer
-          </parameter> and
-          <parameter>Simple framebuffer driver</parameter>
-        </term>
-        <listitem>
-          <para>These allow to use the VESA framebuffer (or the EFI
-          framebuffer if booting the LFS system via UEFI) as a DRM device.
-          The VESA framebuffer will be set up by GRUB (or the EFI
-          framebuffer will be set up by the UEFI firmware), so the DRM panic
-          handler can function before the GPU-specific DRM driver is
-          loaded.</para>
-        </listitem>
-      </varlistentry>
-
       <varlistentry>
         <term>
           <parameter>

chapter10/kernel/systemd.toml

@@ -15,8 +15,6 @@ DEVTMPFS='*'
 DEVTMPFS_MOUNT='*'
 SYSFB_SIMPLEFB='*'
 DRM='*'
-DRM_PANIC='*'
-DRM_PANIC_SCREEN='kmsg'
 DRM_FBDEV_EMULATION='*'
 DRM_SIMPLEDRM='*'
 FRAMEBUFFER_CONSOLE='*'

chapter10/kernel/systemd.xml

@@ -46,9 +46,6 @@
   <emphasis role='blue'>G</emphasis>raphics support ---&gt;
     &lt;*&gt; <emphasis role='blue'>D</emphasis>irect Rendering Manager (XFree86 4.1.0 and higher DRI support) ---&gt;
                                                                       ...  [DRM]
-      [*]    <emphasis role='blue'>D</emphasis>isplay a user-friendly message when a kernel panic occurs
-                                                                ...  [DRM_PANIC]
-      (kmsg)   <emphasis role='blue'>P</emphasis>anic screen formatter                         [DRM_PANIC_SCREEN]
       <emphasis role='blue'>S</emphasis>upported DRM clients ---&gt;
         [*] <emphasis role='blue'>E</emphasis>nable legacy fbdev support for your modesetting driver
                                                       ...  [DRM_FBDEV_EMULATION]

chapter10/kernel/sysv.toml

@@ -14,8 +14,6 @@ DEVTMPFS='*'
 DEVTMPFS_MOUNT='*'
 SYSFB_SIMPLEFB='*'
 DRM='*'
-DRM_PANIC='*'
-DRM_PANIC_SCREEN='kmsg'
 DRM_FBDEV_EMULATION='*'
 DRM_SIMPLEDRM='*'
 FRAMEBUFFER_CONSOLE='*'

chapter10/kernel/sysv.xml

@@ -33,9 +33,6 @@
   <emphasis role='blue'>G</emphasis>raphics support ---&gt;
     &lt;*&gt; <emphasis role='blue'>D</emphasis>irect Rendering Manager (XFree86 4.1.0 and higher DRI support) ---&gt;
                                                                       ...  [DRM]
-      [*]    <emphasis role='blue'>D</emphasis>isplay a user-friendly message when a kernel panic occurs
-                                                                ...  [DRM_PANIC]
-      (kmsg)   <emphasis role='blue'>P</emphasis>anic screen formatter                         [DRM_PANIC_SCREEN]
       <emphasis role='blue'>S</emphasis>upported DRM clients ---&gt;
         [*] <emphasis role='blue'>E</emphasis>nable legacy fbdev support for your modesetting driver
                                                       ...  [DRM_FBDEV_EMULATION]