Date: Sun, 7 May 2000 12:15:48 +0200 (CEST) From: =?ISO-8859-1?Q?G=E9rard_Roudier?= <groudier@club-internet.fr> To: Matthew Jacob <mjacob@feral.com> Cc: alpha@FreeBSD.ORG Subject: Re: AlphaServer 4100 Support being integrated Message-ID: <Pine.LNX.4.10.10005071019200.709-100000@linux.local> In-Reply-To: <Pine.BSF.4.05.10005062244120.20474-100000@semuta.feral.com>
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On Sat, 6 May 2000, Matthew Jacob wrote: [...] > sym0: <810> port 0x1fffc00-0x1fffcff mem 0x7fdde00-0x7fddeff irq 4 at dev= ice 1.0 on pci0 > sym0: No NVRAM, ID 7, Fast-10, SE, parity checking > sym0: open drain IRQ line driver > sym0: using NCR-generic firmware. > sym0: initial SCNTL3/DMODE/DCNTL/CTEST3/4/5 =3D (hex) 00/00/00/00/00/00 > sym0: final SCNTL3/DMODE/DCNTL/CTEST3/4/5 =3D (hex) 03/c8/00/00/08/00 > sym0: Delay (GEN=3D11): 403 msec, 22055 KHz > sym0: Delay (GEN=3D11): 426 msec, 20864 KHz > sym0: Delay (GEN=3D11): 426 msec, 20864 KHz [...] Based on the boot messages, estimation of PCI clock frequency by the driver is about 20 MHz. Is it correct ? If it is not, then DELAY() may well be very inaccurate on this Alpha machine. (The code used to measure the PCI clock frequency had been written by Stefan Esser for both Linux and FreeBSD ncr drivers. This code was initially only used to measure the SCSI clock frequency of 875 chips (given the SCSI clock frequency value, presence of clock doubler can be guessed). Btw, this code has proven to be as accurate as DELAY() allows). G=E9rard. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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