iMX6-SoloX SABRE-SDB reserve 256MB memory for Cortex-M4

[mileswang]

Hello,

As we know that i.MX 6SoloX Applications Processor has 2 cores: 1 Cortex-A9 core and 1 Cortex-M4 core.

iMX6-SoloX SABRE-SDB has 1024MB (0x80000000-0xBFFFFFFF).system memory.

We want to run linux on Cortex-A9 core, and run vxWorks on Cortex-M4 core.

We want to make memory partitioned as below:

Cortex-M4 core has 256MB (0x80000000-0x8FFFFFFF) memory.

Cortex-A9 core has 768MB (0x90000000-0xBFFFFFFF) memory.

I changed the "imx6sx-sdb.dts" as following:

From

    memory {

        reg = <0x80000000 0x40000000>;

        };

to

    memory {

       reg = <0x90000000 0x30000000>;

       };

It doesn't take effect. Cortex-A9 linux still owns 1024MB memory. I think the uboot may configure .

We are using uboot: imx_v2014.04_3.14.28_1.0.0_ga.

Can you tell me how to implement the memory partition above? Do you have document to describe it?

Thanks,

Miles

[Yuri · Accepted solution]

Hello,

  the dts does not affect Cortex A9 memory allocation.

Please refer to Chapter 1 (Porting U-Boot from an i.MX 6/7 Reference

Board to an i.MX 6/7 Custom Board) of “i.MX_BSP_Porting_Guide.pdf”

how to cofnfigure memory.

http://www.nxp.com/webapp/Download?colCode=L3.14.52_1.1.0_LINUX_DOC

Have a great day,
Yuri

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[mileswang]

Hello,

I'm confused. Which one shall I use to build my uboot?

1. From "Freescale_Yocto_Project_User's_Guide.pdf"

$ repo init -u git://git.freescale.com/imx/fsl-arm-yocto-bsp.git -b imx-3.14.52-1.1.0_ga

2. From readme,

$ repo init -u http://sw-stash.freescale.net/scm/imx/fsl-arm-yocto-bsp.git -b fido-3.14.52-1.1.0_ga

What is the difference?

Thanks,

Miles

[Yuri]

Hello,

Please use "Freescale_Yocto_Project_User's_Guide.pdf".

Regards,

Yuri.

[mileswang]

Hello,

What's wrong?

mwang1@ala-hig4$../bin/repo init -u git://git.freescale.com/imx/fsl-arm-yocto-bsp.git -b imx-3.14.28-1.0.0_ga

  File "../bin/repo", line 232

    with open(GITC_CONFIG_FILE, 'r') as gitc_config:

            ^

SyntaxError: invalid syntax

mwang1@ala-hig4$

[Yuri]

Hello,

Add the following line to the .bashrc file to ensure that the ~/bin folder is in your PATH variable.

$ export PATH=~/bin:$PATH

$ repo init -u git://git.freescale.com/imx/fsl-arm-yocto-bsp.git -b imx-3.14.28-1.0.0_ga

Regards,

Yuri.

[mileswang]

Hello,

In "i.MX_BSP_Porting_Guide.pdf", page 9, step 3:

3. Create a new file in <UBOOT_DIR>/configs/ for the new i.MX-based configuration.

The instruction is an example for the i.MX 6Quad board:

CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/freescale/mx6q<customer_board>/<customer

board>.cfg,MX6Q"

CONFIG_ARM=y                                                                   

CONFIG_TARGET_MX6Q<customer_board>=y                                                   

CONFIG_SYS_MALLOC_F=y                                                          

CONFIG_SYS_MALLOC_F_LEN=0x400                                                  

CONFIG_DM=y                                                                    

CONFIG_DM_THERMAL=y

What is the new file name?

Thanks,

Miles

[Yuri]

Hello,

> What is the new file name?

<customer_board> - it is Your prerogative to name Your board.

Regards,

Yuri