Linux: Is the MMU being initialized/enabled in u-boot or Linux?

ranchu

Guru 20755 points

Tool/software: Linux

Hello,

I have a general question for all TI's chips :

Where usually the MMU is being initialized and enabled ?

Is it in 1st u-boot, 2nd u-boot or Linux ?

Regards,

Ran

over 8 years ago

0 Yordan Kovachev over 8 years ago

TI__Guru**** 161600 points

Hi Ran,

MMU is used in linux kernel & that is where it is enabled.

Best Regards,
Yordan

0 ranchu over 8 years ago in reply to Yordan Kovachev

Guru 20755 points

Hi Yordan,

That really make sense, I just wasn't too confident about it...

Do you know where it is done usually in TI's chips (I didn't find it), is it in cpu/start.S ?

Thanks !
Ran

0 Yordan Kovachev over 8 years ago in reply to ranchu

TI__Guru**** 161600 points

Hi Ran,

See drivers/iommu/ folder. For omap-like devices the driver is omap-iommu.c & iommu.c

Best Regards,
Yordan

0 Pavel Botev over 8 years ago in reply to ranchu

TI__Guru**** 170625 points

Ran,

See also the below wiki pages:

processors.wiki.ti.com/.../TI81XX_PSP_04.04.00.02_Feature_Performance_Guide
processors.wiki.ti.com/.../TI81XX_PSP_IOMMU_Driver_User_Guide

Regards,
Pavel

Processors

Processors forum

Linux: Is the MMU being initialized/enabled in u-boot or Linux?