FF-A spec :) https://developer.arm.com/documentation/den0077/latest
On 2020/8/24 11:30 下午, chen feng wrote:
Hello arm expects, While reading the tf-a spec about the section "3.5.1 Register state". It described that "The MMU must be disabled for a partition that does not run in S-EL0". Does this mean that the S-EL1 SP need to create their own page table and enable the MMU itself. I wonder in this way, it is not very friendly to a SP developer. Since the SP can be a verify simple binary, maybe a single driver which can benefited from the isolation from other partitions. So in the pointer of developing a single driver. I think it do not need to care about the MMU configuration. It will be more friendly to be as easy as developing a user-land binary. The SPMC(SEL2) can do this configure for the SEL1's page-tables and enable MMU for SEL1 before jump into the SP.
So I want to discuss here to understand the meaning behind it.
Cheers, Feng