are there hash function in memory to cache mapping?

Autonomous Machines Jetson & Embedded Systems Jetson TX1
1

Hi nvidia,

We’d like to know about hash function between memory to cache mapping in TX1_Machine.

Our goal is to implement page coloring in TX1_Machine.

if there are hash function, it difficult to implement and want to know in advance.

and also, If a hash function exists, can I find the relevant documentation or information?

Thanks
hwPark

2

Hi hwPark,

We are checking internally with CPU HW team. Will revert soon.

thanks
Bibek

3

Thank you for your reply.

we are sorry, but I have one more question.

we are trying to use u-boot bootloader to disable tx1_machine’s cache and memory prefetcher.

In this regard, I would like to know if there is a u-boot manual or example that allows us to access specific registers and change the relevant bit.

Thanks
hwPark

4

I am still waiting for your answer.

I am trying various ways to implement “page coloring” because I can not do anything while waiting for an answer. But it does not work well.

Your answer is more important because there is already a lot of time delay.

I would appreciate your reply.

5

Unfortunately, internals of ARM are not supposed to be disclosed. What is available online can be refer from here

6

What we want is not the way the “hash function” works, but the existence of it.

It will not be harmful to your security to simply identify the existence of a “hash function”.

I would appreciate it if you think about it again.