eenurkka opened a new pull request #4714:
URL: https://github.com/apache/incubator-nuttx/pull/4714
## Summary
This provides proper system clock and DDR training for the Polarfire Icicle
board. If no bootloader is present, but NuttX is intended to perform as the
system bootloader, it must set up the system clock and DDR properly. This work
provides all the required steps for managing the clocks and memories.
## Impact
If the configuration option CONFIG_MPFS_BOOTLOADER is taken, the system
clock is initialized and DDR training performed. The linker script
ld-envm.script is also used in this case.
## Testing
The software has been tested on two boards:
- Microsemi Polarfire Icicle board
- Aries: M100PFS - PolarFire RISC-V SoC-FPGA Module
However, the file board_liberodefs.h covers only Microsemi Icicle board.
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