Linux/AM5728: CMA configration

Marka Reddy

Part Number: AM5728

Tool/software: Linux

We are working with custom board with emmc as only boot device. We are tring to increase cma by entering the following commands in uboot terminal:

=>setenv optargs cma=256MiB.

=>saveenv

But the saveenv is not working.It returns bad or no device error.

I used uEnv.txt for setting up cma but it too did not work.

I checked the cma using cat /cmd/procline after the boot.

How can i hardcode or set the cma default to 256MiB in uboot or kernel.

regards,

Marka

over 6 years ago

0 Kemal R. Shakir over 6 years ago

TI__Guru 55345 points

Hello Marka,

You have a 3 choices.

1. You can assign the cma size to optargs within the internal environment settings that are embedded to U-Boot in <Processor SDK>/board-support/u-boot-<version>/include/environment/ti/boot.h by changing "optargs=\0" \ line to "optargs=cma=256MiB\0" \ rebuild, reflash and boot the board with the new MLO and u-boot.img.

2. You can change the location of the environment to your boot device by referring to this thread in order to fix the "bad or no device" error while saving the environment with saveenv command.

3. You can change the cma size in kernel by refering to this thread and this page.

Best regards,
Kemal

0 Marka Reddy over 6 years ago in reply to Kemal R. Shakir

Expert 1260 points

Hello Kemal,

I am using sdk03.02 with uboot 2016.05 version . It has no /include/environment/ti/boot.h file.

Regards,

Marka

0 Kemal R. Shakir over 6 years ago in reply to Marka Reddy

TI__Guru 55345 points

Hello Marka,

Edit <Processor SDK>/board-support/u-boot-<version>/include/configs/ti_omap5_common.h file for sdk03.02.

Best regards,
Kemal

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Linux/AM5728: CMA configration