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AM335x EVM Disable module on Linux

Guillaume Guillaume

Prodigy 70 points

Hello,

I would like to know if it's possible to desactivate some modules in the AM335x from Linux ( as LCD module, GFX, USB, etc...)

Our application must have the less power consumption as possible to match with our budget power and I want to verify the power consumption when Linux is in Idle mode.

Until now, cpuidle can only enter in the C0 state and never in the C1 state because the LCD module is still active (saw in Sitara Linux Training wiki page).

Thank you,

Regards,

Guillaume

over 13 years ago

0 Prakash PM over 13 years ago

TI__Intellectual 1275 points

You can disable modules via menuconfig option, please refer below userguide to disable the modules.

http://processors.wiki.ti.com/index.php/AM335x_PSP_User's_Guide#Various_Module_User.27s_Guide

Regards,

Prakash

0 Guillaume Guillaume over 13 years ago in reply to Prakash PM

Prodigy 70 points

Do you mean that disable built-in / module drivers shutdown the clock of the LCD controller ? ( a concrete meaning of my first question )

I forgot to disable the touchscreen driver but the C1 state of Cpuidle is never reach. ( cat /sys/devices/system/cpu/cpu0/cpuidle/state1/time = 0)

I am using the NFS root file system and tftp to load uImage, Do you think that is the reason for cpuidle to not allow the C1 state ?

Regards,

Guillaume

0 Prakash PM over 13 years ago in reply to Guillaume Guillaume

TI__Intellectual 1275 points

Yes, clocks are enabled in the driver. So disable them.

I have personally not verified CPU_IDLE. Here is the userguide.

Yes you can have initrd ramdisk filesystem there by avoid ethernet driver also.

Thanks,

Prakash