Date: Mon, 27 Nov 2006 07:30:14 GMT From: Marcel Moolenaar <xcllnt@mac.com> To: freebsd-i386@FreeBSD.org Subject: Re: i386/105616: UART PCI device just silent... Message-ID: <200611270730.kAR7UE5I068687@freefall.freebsd.org>
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The following reply was made to PR i386/105616; it has been noted by GNATS. From: Marcel Moolenaar <xcllnt@mac.com> To: Helge Oldach <puc-uart@oldach.net> Cc: FreeBSD-gnats-submit@FreeBSD.org Subject: Re: i386/105616: UART PCI device just silent... Date: Sun, 26 Nov 2006 23:21:50 -0800 On Nov 26, 2006, at 11:11 PM, Helge Oldach wrote: > There are no specific hints for the puc-based UARTs. I understand that > PCI devices don't need such hints. Actually, both the "sio kernel" and > the "uart kernel" locate the device identically on the same IRQ and IO > ports. > > Am I mistaken here? No, not at all. You got it right. >> Why do you have PUC_FASTINTR for sio, but not for uart? > > I had just been trying to play with the knobs that I have in the > config > file. PUC_FASTINTR reduces overruns somewhat for the "sio kernel" > but it > doesn't change behaviour at all. Specifically, no impact on this > issue. I think it's time to go back to the question why uart(4) detects the SUN 1889 chipset as 166550 compatible and not as 16650 compatible. I think there may be a chipset-specific issue here that uart(4) seems to trigger. I need to get one of those cards and analyze the problem in more detail. In other words, I think we have gone over the differences and the only difference that remains is that sio(4) and uart(4) interact differently with the hardware. -- Marcel Moolenaar xcllnt@mac.com
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