RTEMS | bsps/riscv: Checked conditions for FDT pointer (!1057)

[Gedare Bloom (@gedare)]

Gedare Bloom commented on a discussion: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1057#note_142530


I would not do these checks on every call. Since this basically boils down to calling `fdt_check_header()` I would add something to call `bsp_fdt_get()` and then `fdt_check_header()` during boot, probably as an `RTEMS_SYSINIT_ITEM`. This seems to be something that would be shared across architectures and should be done in a generic way, rather than in a BSP-specific way, since other architectures also use FDT.

I think this is also already done in `rtems_ofw_init`.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1057#note_142530
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