Re: Unable to use csu_config.h to secure GPIO access from normal world

Hi,

On 06/06/2017 03:57 PM, Abhishek Kumar wrote:

Hello I am using genode trustzone code on imx53 board. AFAIU, following lines in csu_config.h are supposed to regulate the access from normal world:

namespace Csu_config
{
        enum {
                SECURE_GPIO  = 1,
                SECURE_ESDHC = 0,
                SECURE_UART  = 0,
                SECURE_I2C   = 1,
        };
};

Though GPIO is set secure, I am still able to set direction and value of gpios from the linux running in normal world, on top of tz_vmm running in secure world. Should it not raise some exception? Where am I going wrong?

I would assume it to silently ignore your settings, as the GPIO driver's register access is just uncommented. Have a look here:

https://github.com/skalk/linux/commit/eccce1c595d7962c95086d6fa60291f7c2c1a4...

Are you sure that GIO settings are really changed?

Regards Stefan

Thanks Abhishek

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