topic Re: Why mx8mm android can't use memtool? in i.MX Processors

Why mx8mm android can't use memtool?

ching-julo — Fri, 05 Jun 2020 02:41:00 GMT

In that past, on imx6 android bsp, the memtool is workable and useful for engineer to adjust soc register.

While in imx8mm android bsp, memtool access register would cause system crash.

What's the difference? How to enable memtool workable?

Re: Why mx8mm android can't use memtool?

gusarambula — Fri, 05 Jun 2020 17:29:04 GMT

Hello Ching Ju Lo,

With each Android release security has become increasingly important. Given the symptoms when trying to read the registers it could be a problem with permissions. Have you tested with a userdebug (root access) Android build or enabling Development mode on your eng (development image)? (I would not recommend using a user image as it’s the most limited in terms of permissions and debugging)

I hope this helps!

Regards,

Re: Why mx8mm android can't use memtool?

ching-julo — Wed, 22 Jul 2020 13:19:33 GMT

I'm using eng build, there is no sepolicy or permission problem.

Actually, when mmap function called, system crash.

The problem should related to memory mapping.