On 25 Aug 2020 14:41:23 GMT, A. Dumas 
declaimed the following:

>A. Dumas  wrote:
>> It's not 2-3 but 3-4 on the Pi (like he wrote in a follow-up) and the
>> reason is not signed integers but a hardware bug of some sort. Can't be
>> bothered to google up the details, sorry  :)
>
>Hm, maybe not a hardware bug (or SoC limitation), I was sure I read that
>somewhere though. Could be like this:
>https://en.wikipedia.org/wiki/3_GB_barrier

 Which is specific to 32-bit Intel systems -- and covers what I
described... The MMIO space falls into that upper bound that I defined as
"Windows shared DLLs", putting the server OS version limit at 3GB.


--
 Wulfraed                 Dennis Lee Bieber         AF6VN
 wlfraed@ix.netcom.com    http://wlfraed.microdiversity.freeddns.org/

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