topic Re: imx6 Trustzone: How to boot smp kernel in normal world? in i.MX Processors

imx6 Trustzone: How to boot smp kernel in normal world?

shenchun — Thu, 22 May 2014 04:19:31 GMT

I try implement trustzone on collage-mx6q board, now there is a simple secure kernel and secure os can work.

after secure parts startup, it will switch to non-secure status to run uboot and kernel.

now the uboot can work, but the kernel can work only without SMP setting , it means I can only use one processor.

part log:

Linux version 3.0.35-2026-geaaf30e-g679aa00-dirty

......

Calibrating delay loop... 1581.05 BogoMIPS (lpj=7905280)

pid_max: default: 32768 minimum: 301

Mount-cache hash table entries: 512

CPU: Testing write buffer coherency: ok

hw perfevents: enabled with ARMv7 Cortex-A9 PMU driver, 7 counters available

CPU1: failed to come online

I setting some parts what need to do in my opinion.

1. CSU all reg setting 0x00ff00ff

2. SCU SCU Access Control Register is 0xf, SCU Non-secure Access Control Register is 0xfff

3. GIC-v1 ICDISR0-n reg, PPI and SGI all setting non-secure,, SPI almost setting non-secure(except some need secure)

4. some reg in cp15 and PL310 can not setting in non-secure, i have use smc to fix it.

but i have no idea about "CPU1: failed to come online"

is there any suggestion about smp kernel can not work?

Re: imx6 Trustzone: How to boot smp kernel in normal world?

Yuri — Mon, 02 Jun 2014 05:56:13 GMT

Please refer to Chapter 3 (Multicore Startup) of “iMX6_Firmware_Guide.pdf” in the Platform SDK
regarding details of multicore using.

https://www.freescale.com/webapp/Download?colCode=i.MX6_PLATFORM_SDK&location=null&fpsp=1&WT_TYPE=Snippets,%20Boot%20Code,%20Headers,%20Monitors,%20etc.&WT_VENDOR=FREESCALE&WT_FILE_FORMAT=tgz&WT_ASSET=Downloads&sr=54&Parent_nodeId=1337694700967726419044&Parent_pageType=product

In particular, please check SRC accessibility for normal world.

Have a great day,
Yuri

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Re: imx6 Trustzone: How to boot smp kernel in normal world?

shenchun — Thu, 05 Jun 2014 10:50:00 GMT

Hi：Yuri

The SRC accessibility for normal world is ok，I try it long time ago,

because the datasheet has nothing about it's access permission secure or non-secure

so i think it doesn't matter about my question.

thank you for your response

let's keep on discussing it

Best Regards

steven-shen