[PATCH v2 0/3] socfpga: Agilex5: Fix dcache usage in SPL and SMC mailbox flow

[Boon Khai Ng]

Hi all,

Proposing the following fix to address data cache handling issues in
the Agilex5 platform, particularly in the SPL build and SMC mailbox
communication path. It ensures correctness in cache operations.
Other than that, trying to resolve undefined symbol errors, and
provides the necessary configuration to disable data cache in
SPL where required.

Patch Summary:
[1/3] arch: arm: mach-socfpga: smc: Add dcache flushing and
invalidation in smc_send_mailbox()

Ensures that the response buffer from the secure monitor call (SMC)
is properly invalidated in cache to avoid stale data access.

Updates pointer arithmetic by replacing u64 with uintptr_t to
improve portability and correctness.

[2/3] cache: Check dcache availability before calling cache functions

Adds a !CONFIG_IS_ENABLED(SYS_DCACHE_OFF) check before calling
dcache_status() and mmu_status() to avoid compilation failures
when dcache is disabled.

[3/3] configs: agilex5: Enable config SPL_SYS_DCACHE_OFF

Disables SPL data cache explicitly via CONFIG_SPL_SYS_DCACHE_OFF
to align with the above changes and prevent inconsistencies during
early boot.

This patchset has been tested on Agilex5 and resolves the SPL build
issues related to missing symbols, while also improving runtime
robustness in SMC-based communication.

Let me know if there are any concerns or feedback. Thank you!

Changes from previous submitted patches:
v1:
Using weak function to resolve the compilation failed
with undefined function when invoking cache related function.
https://patchwork.ozlabs.org/project/uboot/patch/
20250806032206.16688-3-boon.khai.ng at altera.com/

Boon Khai Ng (3):
  arch: arm: mach-socfpga: smc: Add dcache flushing and invalidation in
    smc_send_mailbox()
  cache: Check dcache availability before calling cache functions
  configs: agilex5: Enable config SPL_SYS_DCACHE_OFF

 arch/arm/include/asm/io.h         | 28 ++++++++++++++++------------
 arch/arm/mach-socfpga/smc_api.c   |  1 +
 common/memsize.c                  |  5 ++++-
 configs/socfpga_agilex5_defconfig |  1 +
 4 files changed, 22 insertions(+), 13 deletions(-)

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2.35.3