Cannot check DEP/NX flag in imx6

[rockie_love_nxp]

Hi all,

I built my image for imx6 board with yocto project that uses meta-freescale bsp.

Currently, we want to check if DEP/NX is enable but cannot find any information from:

dmesg | grep NX

also in cat /proc/cpuinfo, there is no "nx" flag.

processor : 0
BogoMIPS : 10.00
Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4

processor : 1
BogoMIPS : 10.00
Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4

processor : 2
BogoMIPS : 10.00
Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4

processor : 3
BogoMIPS : 10.00
Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4

I only check the other board S32G with meta-alb but still the same, I cannot check if flag DEP/NX is enable.
Could you please let me know if NXP board support NX bit? Or are there any bugs in BSP?

Thank you

[Bio_TICFSL]

Hello,

Neither the S32G and i.MX uses DEP / NX.

DEP is used by default in Ubuntu. This is done via the NX bit if the CPU supports it, or emulated via memory segmentation if the CPU does not support it. For more details, see the non-executable memory feature item.

regards

[rockie_love_nxp]

Hi Bio_TICFSL,

Thank you for your quick reply. So that means we cannot use DEP feature on i.MX series? Otherwise, should I implement it by myself?
As i read that from armv7, it's already supported XN bit. But I cannot find any method to test if that is used in Linux or not.

[Bio_TICFSL]

Hello,

in this case you should implement yourself.

Regards