Re: [PATCH v2 3/3] spi: cadence_qspi: Use APB write protection

Marek Vasut via U-Boot <[email protected]>
Newsgroups org.u-boot-project.lists.u-boot
Message-ID <[email protected]> 
On 8/14/26 8:28 PM, Ralph Siemsen wrote:
> Add an option to make use of hardware write protection in the QSPI
> controller. This helps prevent flash corruption due to stray writes.
> No stray writes have been observed, this is defensive code.
> 
> When enabled, the controller is configured to block writes to flash. Due
> to known errata [1] the full 32-bit address range is protected, even
> though the flash occupies only a portion.
> 
> The protection gets temporarily lifted while intentionally writing
> to flash, for example using "sf write" command.
> 
> [1] https://www.renesas.com/en/document/tcu/qspi-contoller-issue
> 
> Signed-off-by: Ralph Siemsen <[email protected]>

Reviewed-by: Marek Vasut <[email protected]>
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