Concerns were raised, that skipping the boot menu, if only one device is
present, might make debugging issues more difficult. So, extend the
current runtime configuration option `etc/show-boot-menu` to enable this
feature by setting it to 2.

Fixes: 29ee1fb8 ("Skip boot menu and timeout with only one boot device")
Signed-off-by: Paul Menzel <pmen...@molgen.mpg.de>
---
 docs/Runtime_config.md | 2 +-
 src/boot.c             | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/docs/Runtime_config.md b/docs/Runtime_config.md
index 6747e2a..5795382 100644
--- a/docs/Runtime_config.md
+++ b/docs/Runtime_config.md
@@ -173,7 +173,7 @@ There are several additional configuration options 
available in the
 
 | Filename            | Description
 |---------------------|---------------------------------------------------
-| show-boot-menu      | Controls the display of the boot menu. Set to 0 to 
disable the boot menu.
+| show-boot-menu      | Controls the display of the boot menu. Valid values 
are 0: Disable the boot menu, 1: Display boot menu unconditionally, 2: Skip 
boot menu if only one device is present. The default is 1.
 | boot-menu-message   | Customize the text boot menu message. Normally, when 
in text mode SeaBIOS will report the string "\\nPress ESC for boot 
menu.\\n\\n". This field allows the string to be changed. (This is a string 
field, and is added as a file containing the raw string.)
 | boot-menu-key       | Controls which key activates the boot menu. The value 
stored is the DOS scan code (eg, 0x86 for F12, 0x01 for Esc). If this field is 
set, be sure to also customize the **boot-menu-message** field above.
 | boot-menu-wait      | Amount of time (in milliseconds) to wait at the boot 
menu prompt before selecting the default boot.
diff --git a/src/boot.c b/src/boot.c
index cc87b1d..a395347 100644
--- a/src/boot.c
+++ b/src/boot.c
@@ -685,12 +685,13 @@ void
 interactive_bootmenu(void)
 {
     // XXX - show available drives?
+    u64 show_boot_menu = romfile_loadint("etc/show-boot-menu", 1);
 
-    if (! CONFIG_BOOTMENU || !romfile_loadint("etc/show-boot-menu", 1))
+    if (! CONFIG_BOOTMENU || show_boot_menu != 0)
         return;
 
     // skip menu if only one boot device and no TPM
-    if ((NULL == BootList.first->next) && !tpm_can_show_menu()) {
+    if ((show_boot_menu == 2) && (NULL == BootList.first->next) && 
!tpm_can_show_menu()) {
        printf("\n");
        return;
     }
-- 
2.26.2
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