Re: [PATCH] fsl/smp: add low power boot support to replace spin boot

On 01/14/2015 10:05 PM, Dongsheng Wang wrote:

From: Wang Dongsheng <redacted>

U-boot put non-boot cpus into an low power state(PW10/PW20 or DOZE) when cpu
powered up. To exit low power state kernel will send DOORBELL or MPIC-IPI
signal to all those CPUs.

e500/e500v2 use mpic to send IPI signal.
e500mc and later use doorbell to send IPI signal.

This feature tested on:
POWER UP TEST:
P1022DS(e500v2),96k times.
P4080(e500mc),  110k times.
T1024(e5500),   83k times.
T4240(e6500),   150k times.

CPU HOTPLUG TEST:
P1022DS(e500v2),1.4 million times.
P4080(e500mc),  1.8 million times.
T1024(e5500),   1.3 million times.
T4240(e6500),   1.1 million times.

Signed-off-by: Wang Dongsheng <redacted>

This is a very good move. Can you explain what has been tested for 100K times,
or over a million times?

Have you verified on older e500v2 platforms, such as MPC8572?

York