lock up related to CONFIG_CPU_IDLE on TI Panda 4460 Linux Linaro ubuntu.

[Botao]

On TI Panda 4460 board Linux Linaro ubuntu image:

http://snapshots.linaro.org/raring/pre-built/panda/491/panda-raring_developer_20131012-491.img.gz

Serial console command line prompt is unavailable. Please refer to attachment to get the log output. Same behaviour observed on build 493 as well.

Same image works well on TI Panda 4430 board.

[Andrey Konovalov (andrey-konovalov)]

Reproduced this lock-up (status LEDs stop blinking when console output stops) on current linux-linaro tree (v3.12-rc4 based, the tag is ll-20131015.0).
Disabling CPU_IDLE makes the 4460 board to boot to the command prompt. (Panda 4430 boots fine regardless of CONFIG_CPU_IDLE setting)

Amit (Kucheria), could you comment on that? Would disabling CONFIG_CPU_IDLE be a valid workaround for the 13.10 release, or an overkill?

Thanks!

[Andrey Konovalov (andrey-konovalov)]

v3.12-rc5 behaves the same with the kernel config produced by:

ARCH=arm scripts/kconfig/merge_config.sh linaro/configs/linaro-base.conf linaro/configs/distribution.conf linaro/configs/omap2plus.conf linaro/configs/panda.conf

[Daniel Lezcano (daniel-lezcano)]

Look at the following if they introduce the bug:

https://git.linaro.org/gitweb?p=kernel/linux-linaro-tracking.git;a=commit;h=59e998561103a93f294c8d3138dd659af772a5da
https://git.linaro.org/gitweb?p=kernel/linux-linaro-tracking.git;a=commit;h=f983827bcb9d2c34c4d8935861a1e9128aec2baf
https://git.linaro.org/gitweb?p=kernel/linux-linaro-tracking.git;a=commit;h=9e19b73c30a5fa42a53583a1f7817dd857126156

[Andrey Konovalov (andrey-konovalov)]

These two commits fix the Panda ES booting:
https://git.linaro.org/gitweb?p=kernel/linux-linaro-tracking.git;a=commitdiff;h=75504145a559200cad4da6fac2151c98a11f4393
https://git.linaro.org/gitweb?p=kernel/linux-linaro-tracking.git;a=commitdiff;h=cd2944d615cdf345d874e82fd966d1af891e63e1

They have been included into ll-20131018.0

[Kevin Hilman (khilman-deactivatedaccount)]

Please note that the fixes commited are have been reviewed/rejected upstream so are not the final fixes. You will likely have to revert these when the proper fix goes upstream.

[Andrey Konovalov (andrey-konovalov)]

Right, these two commits are just what we have to use for this cycle

[Botao (botao-sun)]

On TI Panda 4460 board with Linux Linaro ubuntu image:

http://snapshots.linaro.org/raring/pre-built/panda/500/panda-raring_developer_20131021-500.img.gz

Serial console works well now. This bug now can be considered as "Fix Released" on Linaro image. Please refer to attachment to get the boot log.

[Andrey Konovalov (andrey-konovalov)]

For the record.
The reworked, version 2, fix has been sent upstream:
http://www.spinics.net/lists/linux-omap/msg99244.html
It will not get into 13.10, but will be used in the future releases.

[Andrey Konovalov (andrey-konovalov)]

The version 2 of the fix mentioned in the above comment has been included into linux-linaro tree, the ll-20131031.0 tag