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

Kevin Hilman
2011-02-11T23:31:25Z

Hi Dave,

Dave Martin <dave.martin@linaro.org> writes:

> 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.

OK, I tried some more testing with your 'dirty' branch merged with my PM
branch.

Compiled in ARM mode, everything worked as expected on my 3530/omap3evm,
including off-mode (in suspend and idle). My 3630 (Zoom3) also can't do
CORE off due to i583, but MPU, PER etc. all can hit off.

To rebuild in Thumb-2 mode, I disabled OMAP2 support and added Thumb-2
mode:

CONFIG_ARCH_OMAP2=n
CONFIG_THUMB2_KERNEL=y

then tested on 3530/omap3evm. Testing suspend/resume to retention
seemed to work fine. However, enabling retention during idle[1] hung
someplace (didn't debug further.)

I also tried off-mode, and suspend/resume to off didn't even work.

I didn't have time to debug this any further, so this is just to report
raw test results.

Hope that helps,

Kevin

[1] Here's what's needed to attempt low-power states during idle

# UART timeouts: omap-serial (4th UART only on OMAP36xx and OMAP4)
echo 5 > /sys/devices/platform/omap/omap_uart.0/sleep_timeout
echo 5 > /sys/devices/platform/omap/omap_uart.1/sleep_timeout
echo 5 > /sys/devices/platform/omap/omap_uart.2/sleep_timeout
echo 5 > /sys/devices/platform/omap/omap_uart.3/sleep_timeout

# enable low-power states during idle
echo 1 > /debug/pm_debug/sleep_while_idle

[2] to enable off-mode

echo 1 > /debug/pm_debug/enable_off_mode