Some lazy bastard wrote wrote:
>   I didn't measure this directly, [...]

Okay, here's the missing data:

NAND boot:
        falling edge of POWER to IO_3V3 up:      43ms
        IO_3V3 to start:                          2ms
        start: to done_relocate:                127ms

        total:                                  172ms

NOR boot:
        falling edge of POWER to IO_3V3 up:      43ms
        IO_3V3 to start:                         <1ms
        start: to done_relocate:                 55ms

        total:                                   98ms

So my original approximations were about 22ms too short. This changes
the boot to NAND menu instructions from

>   - wait 1s (more than 150ms, less than 2.8s)

to

>   - wait 1s (more than 175ms, less than 2.8s)

- Werner

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