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.
It is also more aggressive than my last post: all affected
low-level code is now built in Thumb-2. At least some of this
code definitely works, but whether the Secure firmware can talk
to Thumb-2 code properly is unproven:
in particular, I could use some help/advice from the omap
community for validating that the low-level power management
interactions actually work with this patch set.
I've done simple "does it boot?" testing by building a single
kernel with CONFIG_SMP_ON_UP and CONFIG_THUMB2_KERNEL enabled
which works on Beagle xM A2 and Panda A1.
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
Dave Martin (5):
ARM: omap4: Correct definition of do_wfi() for CONFIG_THUMB2_KERNEL
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 | 5 ++
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, 69 insertions(+), 30 deletions(-)
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