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Commit 4f5ef922 authored by Will Deacon's avatar Will Deacon Committed by Russell King
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ARM: 7073/1: debug: augment DEBUG_LL Kconfig help to clarify behaviour 



Enabled DEBUG_LL hardcodes the UART address into the kernel and results
in a non-portable kernel image. Since this option is only intended for
use when debugging early boot failures, supporting multiple platforms
in such a configuration is not the intended use-case.

This patch documents this limitation in the DEBUG_LL Kconfig help text,
so that users are aware of the portability restrictions that are associated
with enabling low-level debugging support.

Reported-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 17916b28

arch/arm/Kconfig.debug

+6 −1
Original line number Diff line number Diff line
@@ -65,13 +65,18 @@ config DEBUG_USER 


# These options are only for real kernel hackers who want to get their hands dirty.

config DEBUG_LL

	bool "Kernel low-level debugging functions"

	bool "Kernel low-level debugging functions (read help!)"

	depends on DEBUG_KERNEL

	help

	  Say Y here to include definitions of printascii, printch, printhex

	  in the kernel.  This is helpful if you are debugging code that

	  executes before the console is initialized.



	  Note that selecting this option will limit the kernel to a single

	  UART definition, as specified below. Attempting to boot the kernel

	  image on a different platform *will not work*, so this option should

	  not be enabled for kernels that are intended to be portable.



choice

	prompt "Kernel low-level debugging port"

	depends on DEBUG_LL