Saving environment variables in u-boot

Reply: Mark Millard via freebsd-arm : "Re: Saving environment variables in u-boot"
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From: bob prohaska <fbsd_at_www.zefox.net>
Date: Thu, 16 Dec 2021 18:07:04 UTC

How does one go about saving environment variables in u-boot on 
Raspberry Pi 3? For example,

Bus usb@7e980000: USB DWC2
scanning bus usb@7e980000 for devices... 6 USB Device(s) found
       scanning usb for storage devices... 0 Storage Device(s) found
U-Boot> editenv usb_pgood_delay
edit: 2
U-Boot> usb reset              
resetting USB...
Bus usb@7e980000: USB DWC2
scanning bus usb@7e980000 for devices... 6 USB Device(s) found
       scanning usb for storage devices... 1 Storage Device(s) found
U-Boot> saveenv
Saving Environment to FAT... Failed (1)
U-Boot> 

It appears that setting usb_pgood_delay to 2 helped, so I'd like to
try it without manual intervention. 

It must be admitted that repeated manual tries of this experiment yield
inconsistent results, so this particular test case is mostly an example.

Still, how does one change and save settings in u-boot?  

Thanks for reading,

bob prohaska