# Yocto grub suppressed console output (quiet) **URL:** \ **Category:** Yocto Project\ **Tags:** intel, grub, uefi, dunfell\ **Created:** [January 25, 2022, 12:55pm UTC](https://hub.mender.io/t/yocto-grub-suppressed-console-output-quiet/4532 "2022-01-25T12:55:41Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![B-Stefan](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/b-stefan/32/1473_2.png) [@B-Stefan](https://hub.mender.io/u/B-Stefan)\ **Post date:** [January 25, 2022, 12:55pm UTC](https://hub.mender.io/t/yocto-grub-suppressed-console-output-quiet/4532/1 "2022-01-25T12:55:41Z")
# Question I’m using the grub-UEFI integration of mender that is based on: [GitHub - mendersoftware/grub-mender-grubenv](https://github.com/mendersoftware/grub-mender-grubenv). I would like to add the grub `quiet ` option so that the grub console output will be suppressed or redirected to a serial port. Is there any hidden option to append the quiet option to the kernel boot options? I could not find anything in the bb files of the mender-meta layer. The desired result is that the boot is without any log message on the screen. # Board description - Intel-x64-x68 # Prerequirements ### layer.conf ```auto INHERIT += "mender-full" PREFERRED_VERSION_mender-client = "3.1.0" MENDER_STORAGE_DEVICE = "/dev/sda" MENDER_DEVICE_TYPE="x86_64" MENDER_FEATURES_DISABLE_append = " mender-uboot mender-image-sd mender-growfs-data" IMAGE_ROOTFS_SIZE="1572864" MENDER_BOOT_PART_SIZE_MB="2048" MENDER_STORAGE_TOTAL_SIZE_MB = "6144" MENDER_DATA_PART_SIZE_MB = "128" ``` ---
**Author:** ![leonardo-k](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/leonardo-k/32/1472_2.png) [@leonardo-k](https://hub.mender.io/u/leonardo-k)\ **Post date:** [January 27, 2022, 1:25pm UTC](https://hub.mender.io/t/yocto-grub-suppressed-console-output-quiet/4532/2 "2022-01-27T13:25:32Z")
Hi , i don’t know if this can help but maybe you can use the [poky’s splash screen recipe](https://layers.openembedded.org/layerindex/recipe/587/) and change the image with a bbappend in your layer, so you will not see any log . And , if you want a completely black screen , just put a black image 😛 ---
**Author:** ![B-Stefan](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/b-stefan/32/1473_2.png) [@B-Stefan](https://hub.mender.io/u/B-Stefan)\ **Post date:** [January 27, 2022, 6:09pm UTC](https://hub.mender.io/t/yocto-grub-suppressed-console-output-quiet/4532/3 "2022-01-27T18:09:28Z")
I’ve already included that recipe, and it shows an image. Unfortunately, the welcome to GRUB message is way earlier in the boot order, so that splash will not be a solution. ---
**Author:** ![MarekBelisko](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/marekbelisko/32/33_2.png) [@MarekBelisko](https://hub.mender.io/u/MarekBelisko)\ **Post date:** [January 28, 2022, 7:22am UTC](https://hub.mender.io/t/yocto-grub-suppressed-console-output-quiet/4532/4 "2022-01-28T07:22:17Z")
Hi @B-Stefan welcome to community. I had same requirement some time ago and was hacking grub but there is no way to disable it (at least one I found) other then this patch: ```auto From 9d78a003040c0a56d729f9844b1ce311b04e9287 Mon Sep 17 00:00:00 2001 From: Marek Belisko Date: Wed, 8 May 2019 16:28:18 +0200 Subject: [PATCH] Disable welcome to grub messages + others Signed-off-by: Marek Belisko --- grub-core/kern/misc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/grub-core/kern/misc.c b/grub-core/kern/misc.c index d1a54df..bfa5fe4 100644 --- a/grub-core/kern/misc.c +++ b/grub-core/kern/misc.c @@ -109,6 +109,8 @@ grub_strcpy (char *dest, const char *src) int grub_printf (const char *fmt, ...) { + return 0; + va_list ap; int ret; -- 2.7.4 ``` This disable all grub messages so you won’t see anything from grub at all. Hope it helps. ---
**Author:** ![B-Stefan](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/b-stefan/32/1473_2.png) [@B-Stefan](https://hub.mender.io/u/B-Stefan)\ **Post date:** [February 3, 2022, 8:00pm UTC](https://hub.mender.io/t/yocto-grub-suppressed-console-output-quiet/4532/5 "2022-02-03T20:00:01Z")
Thanks for the input and the hint for the grub solution. I’m working on it and will let you know if it worked . For the grub env you just can modify the boot args of grub ### File structure **Be aware that for all yocto .bbappend files the location is crucial** ![Screenshot 2022-02-03 at 20.57.41](https://canada1.discourse-cdn.com/flex036/uploads/mender/original/2X/3/30b35750a95eee94d2cbdf61220f636b4bbbb88a.png) ### grub-mender-grubenv\_%.bbappend ```auto FILESEXTRAPATHS_prepend_mender-client-install := "${THISDIR}/files:" SRC_URI_append_mender-client-install = " file://03_qemu_console_grub.cfg;subdir=git" ``` ### 03\_qemu\_console\_grub.cfg ```auto set console_bootargs="fbcon=map:2 quiet video=LVDS-1:e video=LVDS-2:e video=VGA-1:d video=HDMI-1:d" ```