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fix(memory): ignore emulated writes to mapped BIOS

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0xrsydn 2026-10-07 03:31:33 +07:00
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docs/hardware/cpu.md
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@ -146,7 +146,8 @@ Limits remain explicit:
- Unused/write-only I/O reads, general DMA-to-CPU bus handoff, and disabled-RAM reads are not modeled here.
[DMA channel data](dma.md#retained-channel-data) is separate and never overrides a CPU snapshot.
- Missing BIOS, truncated ROM, unsupported I/O, and save-memory accesses retain their existing diagnostics.
- Unused-memory writes remain diagnostics rather than ignored hardware writes. Swaps cannot silently discard their write.
- Unused-memory writes remain diagnostics rather than ignored hardware writes. Swaps to those ranges still fail.
- Writes to the mapped BIOS are a separate [ignored-write subset](bios.md#writes-to-the-mapped-bios), including swap write phases.
- ARM/Thumb instruction buffering is persistent, but these data snapshots remain a separate bounded model.
Thumb IWRAM bus-history samples do not share storage with retained instructions.
DMA updates IWRAM lanes at instruction boundaries, not during CPU accesses.