[PATCH v4 0/5] ARM: omap[34]: Thumb-2 compatibility fixes

Dave Martin
2011-02-09T15:01:34Z

This set of patches, along with some other patches under
discussion on alkml, should enable omap3 and omap4 kernels to be
built with CONFIG_THUMB2_KERNEL.

This patch set builds on recent cleanup done by the omap
maintainers.

All affected low-level code is now built in Thumb-2. At least some
of this code definitely works, most features have been tested
successfully. Further testing, especially of Thumb-2 behaviour, is
still welcome.

Seems to work with CONFIG_SMP_ON_UP and CONFIG_THUMB2_KERNEL
enabled on Beagle xM A2 and Panda A1.

Thanks also to Santosh Shilimkar <santosh.shilimkar@ti.com>
for his help with testing.

v3:
* make SMC instruction syntax more consistent
* remove do_wfi() in favour of the generic wfi() macro

v4:
* revert to the OMAP-specific do_wfi() implementation, pending
discussion of how generic macros can/should be provided

Details below.

Cheers,
Dave

The patches can be found, along with a buildable working tree,
in the following repo:

git://git.linaro.org/people/dmart/linux-2.6-arm.git

* arm/omap-thumb2: has the patches proposed here
* arm/omap-thumb2+merged: additionally has some patches cherry-
picked from other trees which are needed in order for the
patches on arm/omap-thumb2 to work usefully.
* dirty/arm/omap-thumb2+merged: buildable test tree, which adds
2 local patches to work around a toolchain bug.

A working kernel config for this tree is here:
http://people.linaro.org/~dmart/arm_omap-thumb2+v2_config :

CONFIG_SMP_ON_UP=y
CONFIG_THUMB2_KERNEL=y
CONFIG_SERIAL_OMAP=n (to avoid garbage on xM; for Panda use console=ttyS2)

(The config is derived from the linaro omap config and so turns on
loads of modules -- don't feel you have to build them all...)

Cherry-picked patches originated from Russell's devel tree
and Tony Lindgren's omap-testing tree:

http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm.git devel

git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6.git omap-testing

This series also depends on one un-merged patch to generic-ise
the wfi() macro:

git://git.linaro.org/people/dmart/linux-2.6-arm.git arm/wfi-macro

Dave Martin (5):
ARM: omap4: Provide do_wfi() for Thumb-2
ARM: omap4: Convert END() to ENDPROC() for correct linkage with
CONFIG_THUMB2_KERNEL
ARM: omap3: Remove hand-encoded SMC instructions
ARM: omap3: Thumb-2 compatibility for sram34xx.S
ARM: omap3: Thumb-2 compatibility for sleep34xx.S

arch/arm/mach-omap2/include/mach/omap4-common.h | 4 ++
arch/arm/mach-omap2/omap-headsmp.S | 2 +-
arch/arm/mach-omap2/omap44xx-smc.S | 8 ++--
arch/arm/mach-omap2/sleep34xx.S | 56 ++++++++++++++++-------
arch/arm/mach-omap2/sram34xx.S | 28 ++++++++---
5 files changed, 68 insertions(+), 30 deletions(-)