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Reset and release CRC before any nBoot API call #64

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Reset and release CRC before any nBoot API call #64

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13 changes: 13 additions & 0 deletions libs/ec-slimloader-mcxa/src/board.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -334,6 +334,19 @@ impl<C: McxaConfig + BootStatePolicy> Board for Mcxa<C> {
embassy_mcxa::init(bl_cfg)
};

// The ROM leaves CRC0 held in reset after boot, but NBOOT image authentication
// uses it; a CRC0 still in reset bus-faults on first access. Clock it and release
// it from reset here, after embassy_mcxa::init (which unlocks MRCC).
// SAFETY: nothing else uses CRC0 at this point in boot.
#[cfg(all(target_os = "none", feature = "mcxa5xx"))]
unsafe {
// CRC0 is bus-clocked; the returned pre-enable parts carry nothing to keep (no WakeGuard)
let _ = embassy_mcxa::clocks::enable_and_reset::<peripherals::CRC0>(
&embassy_mcxa::clocks::periph_helpers::NoConfig,
)
.unwrap_or_else(|_| panic!("CRC0 enable failed"));
}

#[cfg(all(target_os = "none", feature = "mcxa5xx"))]
let sgi = p.SGI0;

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