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Correct Default SPL_SIZE_LIMIT for Cyclone/Arria V #19

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@TCWORLD TCWORLD commented Nov 14, 2024

Refer to the Cyclone V Hard Processor System Technical Reference Manual (same for Arria V), Section A-32, "Loading the Preloader Image". The upper 4kB of the on-chip RAM is reserved by the Boot ROM, meaning only 60kB is available for the preloader. If the SPL extends into this region, it causes the boot ROM to crash.

Proper validation will prevent confusion when the preloader doesn't run due to being too large.

Refer to the Cyclone V Hard Processor System Technical Reference Manual (same for Arria V), Section A-32, "Loading the Preloader Image".
The upper 4kB of the on-chip RAM is reserved by the Boot ROM, meaning only 60kB is available for the preloader. If the SPL extends into this region, it causes the boot ROM to crash.
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