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ARM: 5841/1: a driver for on-chip ETM and ETB

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This driver implements support for on-chip Embedded Tracing Macrocell and
Embedded Trace Buffer. It allows to trigger tracing of kernel execution flow
and exporting trace output to userspace via character device and a sysrq
combo.

Trace output can then be decoded by a fairly simple open source tool [1]
which is already sufficient to get the idea of what the kernel is doing.

[1]: http://github.com/virtuoso/etm2human

Signed-off-by: Alexander Shishkin <virtuoso@slind.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Alexander Shishkin
2009-12-01 14:00:51 +01:00
committed by Russell King
parent 29e553631b
commit c5d6c7708c
4 changed files with 816 additions and 0 deletions
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8
arch/arm/Kconfig.debug
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@@ -83,6 +83,14 @@ config DEBUG_ICEDCC
It does include a timeout to ensure that the system does not
totally freeze when there is nothing connected to read.
config OC_ETM
bool "On-chip ETM and ETB"
select ARM_AMBA
help
Enables the on-chip embedded trace macrocell and embedded trace
buffer driver that will allow you to collect traces of the
kernel code.
config DEBUG_DC21285_PORT
bool "Kernel low-level debugging messages via footbridge serial port"
depends on DEBUG_LL && FOOTBRIDGE