From mboxrd@z Thu Jan 1 00:00:00 1970 From: will.deacon@arm.com (Will Deacon) Date: Fri, 30 Sep 2011 10:28:47 +0100 Subject: [PATCH] ARM: debug: provide dummy default option for DEBUG_LL UART choice Message-ID: <1317374927-4997-1-git-send-email-will.deacon@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 Signed-off-by: Will Deacon --- This came out of discussion on the list yesterday but I thought I'd better post a patch before sending to Russell. Will arch/arm/Kconfig.debug | 12 ++++++++++-- 1 files changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index 32b1be4..5bc7814 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -81,6 +81,14 @@ choice prompt "Kernel low-level debugging port" 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 bool "Kernel low-level debugging via EmbeddedICE DCC channel" help @@ -89,8 +97,8 @@ choice co-processor 14. This is known to work on the ARM9 style ICE channel and on the XScale with the PEEDI. - It does include a timeout to ensure that the system does not - totally freeze when there is nothing connected to read. + Note that the system will appear to hang during boot if there + is nothing connected to read from the DCC. config DEBUG_FOOTBRIDGE_COM1 bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1" -- 1.7.0.4