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ARM: 7116/1: debug: provide dummy default option for DEBUG_LL UART choice 

Defaulting to DEBUG_ICEDCC will cause systems to hang during boot unless
a hardware debugger is listening to the debug comms. channel.

This patch adds a dummy UART option as the default DEBUG_LL choice which
requires the platform to do the right thing.

Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Tested-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon 2011-10-03 18:29:03 +01:00 committed by Russell King
parent 6996f425e5
commit f73765fcb8
1 changed files with 10 additions and 2 deletions
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12
arch/arm/Kconfig.debug
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@ -81,6 +81,14 @@ choice
prompt "Kernel low-level debugging port" prompt "Kernel low-level debugging port"
depends on DEBUG_LL depends on DEBUG_LL
config DEBUG_LL_UART_NONE
bool "No low-level debugging UART"
help
Say Y here if your platform doesn't provide a UART option
below. This relies on your platform choosing the right UART
definition internally in order for low-level debugging to
work.
config DEBUG_ICEDCC config DEBUG_ICEDCC
bool "Kernel low-level debugging via EmbeddedICE DCC channel" bool "Kernel low-level debugging via EmbeddedICE DCC channel"
help help
@ -89,8 +97,8 @@ choice
co-processor 14. This is known to work on the ARM9 style ICE co-processor 14. This is known to work on the ARM9 style ICE
channel and on the XScale with the PEEDI. channel and on the XScale with the PEEDI.
It does include a timeout to ensure that the system does not Note that the system will appear to hang during boot if there
totally freeze when there is nothing connected to read. is nothing connected to read from the DCC.
config DEBUG_FOOTBRIDGE_COM1 config DEBUG_FOOTBRIDGE_COM1
bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1" bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"