[PATCH master v2 0/2] Fix speculative access to firewalled regions on AM62 SoCs

[Anshul Dalal]

Hi all,

This patch series fixes firewall exceptions observed on AM62 family of
devices due to speculative accesses made by the A53 core to secure DDR
regions.

For testing, I had used an AM62p with the following diff to enable
logging from TIFS:

  --- a/board/ti/am62px/board-cfg.yaml
  +++ b/board/ti/am62px/board-cfg.yaml
  @@ -33,5 +33,5 @@ board-cfg:
           subhdr:
               magic: 0x020C
               size: 8
  -        trace_dst_enables: 0x00
  -        trace_src_enables: 0x00
  +        trace_dst_enables: 0xd
  +        trace_src_enables: 0x3f

Without this patch an exception[1] similar to the following is observed
at A53 SPL stage:

  FWL Bit  0x1
  Exception addr  0x45B08000
  FWL Exception  0x1000100
   0x60000
   0x80002880
   0x0
   0x141201
   0x40

[1]: https://software-dl.ti.com/tisci/esd/latest/6_topic_user_guides/firewall_faq.html#how-do-i-debug-firewall-issues

Signed-off-by: Anshul Dalal <anshuld at ti.com>
---
Changes in v2:
- Added Reported-by from Suhaas
- Modify ARMv8's mmu_setup instead of overriding it only for mach-k3
- Add mmu_enable to give boards more control over MMU configruation
- Link to v1: https://patch.msgid.link/20260512-am62_firewall_exception_fix-v1-1-4b274718bdac@ti.com

---
Anshul Dalal (2):
      arm: armv8: mmu: move mmu enablement out of mmu_setup
      mach-k3: enable mmu after reserved memory is unmapped

 arch/arm/cpu/armv8/cache_v8.c    | 5 ++++-
 arch/arm/include/asm/armv8/mmu.h | 5 +++++
 arch/arm/mach-k3/common.c        | 2 ++
 3 files changed, 11 insertions(+), 1 deletion(-)
---
base-commit: 13c1e13cc7fb1fa07867f835ccf25913594c71ec
change-id: 20260512-am62_firewall_exception_fix-20a335cca769

Best regards,
--  
Anshul Dalal <anshuld at ti.com>