Date: Sun, 7 May 2000 11:10:10 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: =?ISO-8859-1?Q?G=E9rard_Roudier?= <groudier@club-internet.fr> Cc: alpha@FreeBSD.ORG Subject: Re: AlphaServer 4100 Support being integrated Message-ID: <Pine.BSF.4.10.10005071109370.7876-100000@beppo.feral.com> In-Reply-To: <Pine.LNX.4.10.10005071019200.709-100000@linux.local>
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Hmm. It's a normal PCI bus. If DELAY is wrong on alpha's, this may explain some of the funnies I've seen elsewhere. Thanks for spotting this. On Sun, 7 May 2000, [ISO-8859-1] G=E9rard Roudier wrote: >=20 >=20 > On Sat, 6 May 2000, Matthew Jacob wrote: >=20 > [...] >=20 > > sym0: <810> port 0x1fffc00-0x1fffcff mem 0x7fdde00-0x7fddeff irq 4 at d= evice 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 >=20 > [...] >=20 > 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. >=20 > (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). >=20 > G=E9rard. >=20 >=20 >=20 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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