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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 <bhelgaas@google.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20230126225420.1320276-1-helgaas@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Bjorn Helgaas 2023-01-26 16:54:20 -06:00 committed by Jonathan Corbet
parent c1966bd1f0
commit a568375ba1
1 changed files with 4 additions and 2 deletions
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6
Documentation/admin-guide/kernel-parameters.txt
View File

@ -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]