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Can Altera SoC devices boot in 4-byte addressing mode when using QSPI as boot memory?
No. Impossible.
This is because the software stored in BootROM operates in 3-byte addressing mode. However, since it is possible to change to 4-byte addressing mode with the Preloader (bootloader) and operate, it is possible to support QSPI devices of 128Mbit or more during normal operation.
Please refer to the link below for details. RocketBoards.org "Soc Board Qspi Boot"
http://www.rocketboards.org/foswiki/Documentation/SocBoardQspiBoot
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