AM2432: Region Based Firewall

Hi Kevin，

   About backgroud region firewal, we can refer the link https://software-dl.ti.com/tisci/esd/latest/6_topic_user_guides/firewall_faq.html#what-are-background-and-foreground-regions

    Following restrictions apply from hardware perspective.

1. A background region cannot overlap with another background region.
2. A foreground region cannot overlap with another foreground region.
3. A foreground region cannot span two background regions.

      Lock region, once this option is selected , the firewall can't configure again. 

      Cached ignore, means the cache read/write operation couldn't trigger firewall violation. 

    Linjun

Hi Chris Meng,

Thanks for your reply.

I have another question is how to understand the "X_X_NONSECURE" and "X_X_SECURE" in firewall configuration in "syscfg"?

   As we know,  there are two mode security/Non-security to  ARM processor.   If the firewall setting is NOSECURE read , then firewall protected address is  accessible when the R5F in NONSECURE mode.

   Here is the link of private id  info .https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/am64x/firewalls.html#list-of-priv-ids .

   We can see  if the Host-ID is 36, which means the transaction happened on  main_0_r5_0 is in nonsecure mode..