drivers: flash: nrf_qspi_nor: Prevent CPU hang when XIP is re-enabled #88967
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Add a simple non-XIP transaction before deactivating the QSPI after a XIP transaction is performed. This prevents a CPU hang from occuring when another XIP transaction is attempted after the QSPI is activated again. Signed-off-by: Andrzej Głąbek <[email protected]>
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de-nordic,
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rghaddab
nordicjm
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Apr 23, 2025
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| /* It turns out that when the QSPI peripheral is deactivated | ||
| * after a XIP transaction, it cannot be later successfully | ||
| * reactivated and an attempt to perform another XIP transaction | ||
| * results in the CPU being hung; even a debug session cannot be | ||
| * started then and the SoC has to be recovered. | ||
| * As a workaround, at least until the cause of such behavior | ||
| * is fully clarified, perform a simple non-XIP transaction | ||
| * (a read of the status register) before deactivating the QSPI. | ||
| * This prevents the issue from occurring. | ||
| */ |
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this seems like the issue I observed/reported years ago on nrf52840...
de-nordic
approved these changes
Apr 23, 2025
rghaddab
approved these changes
Apr 23, 2025
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Add a simple non-XIP transaction before deactivating the QSPI after a XIP transaction is performed. This prevents a CPU hang from occuring when another XIP transaction is attempted after the QSPI is activated again.