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kern/main: Suppress the "Welcome to GRUB!" message in EFI builds

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GRUB EFI builds are now often used in combination with flicker-free
boot, but this breaks with upstream GRUB because the "Welcome to GRUB!"
message will kick the EFI fb into text mode and show the msg, breaking
the flicker-free experience.

EFI systems are so fast, that when the menu or the countdown are
enabled the message will be immediately overwritten, so in these cases
not printing the message does not matter.

And in case when the timeout_style is set to TIMEOUT_STYLE_HIDDEN,
the user has asked GRUB to be quiet (for example to allow flickfree
boot) and thus the message should not be printed.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Robbie Harwood <rharwood@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Hans de Goede 2022-01-28 11:30:33 +01:00 committed by Daniel Kiper
parent 5bb4f2b7d6
commit 3e4cbbeca0
1 changed files with 3 additions and 0 deletions
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3
grub-core/kern/main.c
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@ -270,10 +270,13 @@ grub_main (void)
grub_boot_time ("After machine init.");
/* This breaks flicker-free boot on EFI systems, so disable it there. */
#ifndef GRUB_MACHINE_EFI
/* Hello. */
grub_setcolorstate (GRUB_TERM_COLOR_HIGHLIGHT);
grub_printf ("Welcome to GRUB!\n\n");
grub_setcolorstate (GRUB_TERM_COLOR_STANDARD);
#endif
/* Init verifiers API. */
grub_verifiers_init ();