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From: cinap_lenrek@felloff.net
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X-Bullshit: progressive wrapper configuration-scale interface 
Subject: Re: [9front] 9front on Raspberry Pi 400
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> I wonder whether the Adafruit USB to TTL serial adapter can be seen by 9.

if not, it should be quite easy to add support. the problem with the rasperry
pi uart is that it uses 3.3V, so is not really TTL. you have to be carefull.

for the previous test, i think i made a mistake in the device tree parsing.

i took the parent bus address instead of the child bus address
in the dma-ranges case.

that might be the reason why *pcidmawin had a zero offset in your case.

the offset should appear in the child bus address field and *pcidmawin should
actually be the difference between them for the translation.

i didnt notice in my case as with the pi4 8GB, there is no translation and
both fields addresses are zero.

http://felloff.net/usr/cinap_lenrek/9pi4-pciwin2
http://felloff.net/usr/cinap_lenrek/s9pi4-pciwin2

12f215453abe5bf601cb49861f33b187bfbe8898	9pi4
0c405178ce7d4cc667d5a12176749682ff5a24cb	s9pi4

never give up!

--
cinap