Date: Thu, 17 Oct 2002 13:39:27 -0400 From: Don Bowman <don@sandvine.com> To: "'Kenneth P. Stox'" <stox@imagescape.com>, FreeBSD current users <current@FreeBSD.ORG> Subject: RE: Dedicating an interrupt to a PC-Card slot Message-ID: <FE045D4D9F7AED4CBFF1B3B813C8533701022CBB@mail.sandvine.com>
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> From: Kenneth P. Stox [mailto:stox@imagescape.com] > > Well, I decided to have some fun and see if I could get a > Novatel Merlin > C-201 wireless modem running under FreeBSD. It seems I have run into a > bit of a roadblock. It appears that the C-201 will only speak, through > it's 16550 UART, at a speed of 230400. As such it need to have fast > interrupt support, which only seems possible with a dedicated > interrupt. Doesn't sound like that fast an interrupt. The 16550 has a 16-byte send and receive fifo. Set the rx interrupt @ 14, and the tx @ 2. 230400/8 = 28800 chars /s 28800 / 14 = 2057 interrupts / s. This should be well within reach of a pentium-class machine. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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