From fcfd7396ae8a93ecfe880bbfa6bc3461b98eb6d6 Mon Sep 17 00:00:00 2001
From: Warner Losh <imp@FreeBSD.org>
Date: Sat, 17 Feb 2024 23:14:50 -0700
Subject: [PATCH] loader: Add new option WITH_LOADER_BIOS_TEXTONLY

This option will omit all the graphics support, the teken terminal
library, video mode support, etc and support a simple, basic, text-only
video console for the x86 BIOS boot loader. It uses the FreeBSD 12
version of vidconsole.c. It defaults to NO.

Sponsored by:		Netflix
Differential Revision:	https://reviews.freebsd.org/D43912

(cherry picked from commit 63e9c976640d05ef65842eaf3d54de9a8d48cbdc)
---
 share/man/man5/src.conf.5                     | 6 +++++-
 share/mk/src.opts.mk                          | 1 +
 tools/build/options/WITH_LOADER_BIOS_TEXTONLY | 3 +++
 3 files changed, 9 insertions(+), 1 deletion(-)
 create mode 100644 tools/build/options/WITH_LOADER_BIOS_TEXTONLY

diff --git a/share/man/man5/src.conf.5 b/share/man/man5/src.conf.5
index eec250bcbca..4bb38fe61a7 100644
--- a/share/man/man5/src.conf.5
+++ b/share/man/man5/src.conf.5
@@ -1,5 +1,5 @@
 .\" DO NOT EDIT-- this file is @generated by tools/build/options/makeman.
-.Dd April 11, 2024
+.Dd April 15, 2024
 .Dt SRC.CONF 5
 .Os
 .Sh NAME
@@ -999,6 +999,10 @@ Do not build LLVM target support for X86.
 The
 .Va LLVM_TARGET_ALL
 option should be used rather than this in most cases.
+.It Va WITH_LOADER_BIOS_TEXTONLY
+Use the old, FreeBSD 12 vidconsole.c.
+This only supports text mode without teken, without any graphics, font or video mode support.
+This setting only affects the i386 and amd64 BIOS boot loader.
 .It Va WITH_LOADER_EFI_SECUREBOOT
 Enable building
 .Xr loader 8
diff --git a/share/mk/src.opts.mk b/share/mk/src.opts.mk
index a8b33fcdc6d..788c6a9b956 100644
--- a/share/mk/src.opts.mk
+++ b/share/mk/src.opts.mk
@@ -204,6 +204,7 @@ __DEFAULT_NO_OPTIONS = \
     DTRACE_TESTS \
     EXPERIMENTAL \
     HESIOD \
+    LOADER_BIOS_TEXTONLY \
     LOADER_VERBOSE \
     LOADER_VERIEXEC_PASS_MANIFEST \
     LLVM_ASSERTIONS \
diff --git a/tools/build/options/WITH_LOADER_BIOS_TEXTONLY b/tools/build/options/WITH_LOADER_BIOS_TEXTONLY
new file mode 100644
index 00000000000..08804c19c69
--- /dev/null
+++ b/tools/build/options/WITH_LOADER_BIOS_TEXTONLY
@@ -0,0 +1,3 @@
+Use the old, FreeBSD 12 vidconsole.c.
+This only supports text mode without teken, without any graphics, font or video mode support.
+This setting only affects the i386 and amd64 BIOS boot loader.