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To improve startup times when booting from QSPI flash, the QSPI frequency can be configured very early in the boot process [1] to reduce loading times of U-Boot itself. This patch adds an option to disable setting the frequency to a default value during SoC initialization. [1] https://www.nxp.com/docs/en/application-note/AN12279.pdf Signed-off-by: Mario Kicherer <dev@kicherer.org> Signed-off-by: Peng Fan <peng.fan@nxp.com>