On 24.02.2025 09:55, Marco Felsch wrote:

Hi Laurentiu,

thanks for your patch.

On 25-02-21, Laurentiu Mihalcea wrote:

quoted

From: Laurentiu Mihalcea <redacted>

The secure AHB to IP Slave (AIPSTZ) bus bridge provides access control
configurations meant to restrict access to certain peripherals.
Some of the configurations include:

	1) Marking masters as trusted for R/W. Based on this
	(and the configuration of the accessed peripheral), the bridge
	may choose to abort the R/W transactions issued by certain
	masters.

Setting these bits requires very often that the core is running at EL3
(e.g. secure-monitor) which is not the case for Linux. Can you please
provide more information how Linux can set these bits?

Regards,
  Marco

In this particular case, as far as I was able to understand, NS EL1 has enough

privilege to program this IP. This is why Linux can do it.