davids5 opened a new pull request, #7174:
URL: https://github.com/apache/incubator-nuttx/pull/7174
## Summary
The IDMA needs to have 32 bit word alignment, in fact it will
AND off the lower 2 bits of the value stored in IDMABASE0R.
This bug was masked by CONFIG_ARMV7M_DCACHE causing proper word alignment
and also FAT_DMAMEMORY being aligned.
This commit extends the unaligned logic (used for dcache) to take into
account
the need for a buffer copy when the buffer is ot 32 bit word.
It leverages the fact that when CONFIG_ARMV7M_DCACHE is not defined the
up_xxxxx_dcache are nops.
## Impact
Fixes configuration without CONFIG_ARMV7M_DCACHE
## Testing
Uses PX4's `sd_bench`
CONFIG_STM32H7_SDMMC_IDMA | CONFIG_ARMV7M_DCACHE | Build | Test
-- | -- | -- | --
Off | Off | Pass | Pass
On | Off | Pass | Pass
Off | On | Pass | Pass
On | On | Pass | Pass
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