Date: Mon, 3 Mar 1997 05:10:33 +1100 From: Bruce Evans <bde@zeta.org.au> To: ejs@bfd.com, freebsd-hackers@FreeBSD.ORG Subject: Re: sio projects Message-ID: <199703021810.FAA27377@godzilla.zeta.org.au>
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>Before I embark on my first FreeBSD kernel hacking project, does anyone >know if someone is already working on 16650/16750 UART support? My plans >are for the following > >1) Autodetect the UARTS, and use their deeper fifos. There is already some support for this (for 16550s) in sio.c. It is disabled because it doesn't quite work. I think auto-detection works. >3) Throw in a flag to use the UART-driven hardware flow control methods. The hardware flow control on at least the original 16550's is reported to be worse that useless because it is invoked at the wrong time - at the same time that a fifo-trigger-level-reached interrupt is generated or something like that - it breaks streaming. Bruce
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