From a568375ba175d465c7aad2028bd6f7e18c0ff194 Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Thu, 26 Jan 2023 16:54:20 -0600 Subject: [PATCH] printk: Document that CONFIG_BOOT_PRINTK_DELAY required for boot_delay= Document the fact that CONFIG_BOOT_PRINTK_DELAY must be enabled for the "boot_delay" kernel parameter to work. Also mention that "lpj=" may be necessary. Signed-off-by: Bjorn Helgaas Reviewed-by: Randy Dunlap Link: https://lore.kernel.org/r/20230126225420.1320276-1-helgaas@kernel.org Signed-off-by: Jonathan Corbet --- Documentation/admin-guide/kernel-parameters.txt | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index f7de951..d6ae7bd 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -478,8 +478,10 @@ See Documentation/block/cmdline-partition.rst boot_delay= Milliseconds to delay each printk during boot. - Values larger than 10 seconds (10000) are changed to - no delay (0). + Only works if CONFIG_BOOT_PRINTK_DELAY is enabled, + and you may also have to specify "lpj=". Boot_delay + values larger than 10 seconds (10000) are assumed + erroneous and ignored. Format: integer bootconfig [KNL] -- 2.7.4