Add notes related to power and security for 12.0 release#648
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jsuhaas22 wants to merge 2 commits intoTexasInstruments:masterfrom
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Add notes related to power and security for 12.0 release#648jsuhaas22 wants to merge 2 commits intoTexasInstruments:masterfrom
jsuhaas22 wants to merge 2 commits intoTexasInstruments:masterfrom
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Add note about A53's speculative access into TF-A's firewalled region during boot. This causes TIFS to log a read exception. The exception occurs only once, since TF-A's memory is unmapped later. Signed-off-by: Suhaas Joshi <s-joshi@ti.com>
ti-u-boot-2026.01 applies firewall patches over TF-A and OPTEE memory region. This caused a regression in LPM, which was fixed in 12.0 firmware. Therefore, add a note stating that users should use latest U-Boot with latest firmware, and attempting to use new U-Boot with old firmware will cause LPM to fail. Signed-off-by: Suhaas Joshi <s-joshi@ti.com>
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In 12.0, a new security feature is added: protecting TF-A and OPTEE memory regions with firewalls. The protection is against R/W access by non-secure entities.
This feature caused a regression in LPM, which was fixed in 12.0 firmware binaries. Therefore add a note stating that older firmware won't suit LPM on new U-Boot.It also made A53's speculative read access into TF-A's memory region visible, causing TIFS to log firewall read violation during boot. This isn't harmful to the boot flow and occurs only once, since TF-A and OPTEE regions are immediately unmapped, but it does make TIFS log a firewall read violation if TIFS logs are enabled.
Note both of these concerns in the docs.