boards: adi: Add ability to flash code to external flash #103170
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The SPIXF peripheral allows executing code from external flash, so add example configuration to the APARD32690 board that enables the OpenOCD flash bank so code built targetting the flash can be downloaded there. Signed-off-by: Pete Johanson <[email protected]>
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| default y if CODE_DATA_RELOCATION | ||
| help | ||
| When using code relocation to place code into external flash accessed | ||
| with the SPIXF peripheral, ensure OpenOCD will initialize the bank |
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So is SPIXF necessary for both flashing and code execution !? What about just data access?
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The SPIXF peripheral on MAX32 allows both normal flash access for explicit read/write, but also provides transparent access for read/XIP from flash mapped at 0x80000000. That remapping only will happen if SPIXF is properly initialized though, it doesn't do so automatically after a reset.
The Kconfig here is for ensuring OpenOCD sets up an additional flash bank for that 0x80000000 range, so when flashing an image that includes code relocated there, it will flash that to the attached QSPI (under the hood OpenOCD is using the SPIXF peripheral to perform this flash) for you properly.
The application_development/code_relocation_nocopy sample was updated as part of the SPIXF driver work to properly demonstrate that functionality, but flashing to APARD32690 (the main kit with QSPI flash included, not found on MAX32690EVKIT) previously required various manual tweaks to set up OpenOCD "just right" to do so. I'm trying to upstream the various Zephyr changes needed so this will work OOTB, while other ADI folks work to upstream the needed OpenOCD changes.
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The SPIXF peripheral allows executing code from external flash, so add example configuration to the APARD32690 board that enables the OpenOCD flash bank so code built targetting the flash can be downloaded there.
Note: This depends on some changes to OpenOCD that are actively being submitted upstream now.