Date: Sat, 27 Apr 2002 13:14:14 -0700 (PDT) From: bruno@tinkerbox.org To: hardware@freebsd.org Subject: slow audio with CS4235, Cyrix MII-300 Message-ID: <Pine.BSF.4.21.0204271312210.14570-100000@mail.dvart.com>
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I have a tx98-3D motherboard with integrated crystal CS4235 sound chipset. The audio plays about 25% (by ear...) too slow, with any application. I think it may be CPU frequency-related, or real-time clock related, because of these observations: First thing I noticed is that dmesg shows the cpu detected as this: Timecounter "i8254" frequency 1193182 Hz Timecounter "TSC" frequency 233865878 Hz CPU: Cyrix 6x86MX (233.87-MHz 686-class CPU) Origin = "CyrixInstead" Id = 0x601 Stepping = 1 DIR=0x1454 Features=0x80a135<FPU,DE,TSC,MSR,CX8,PGE,CMOV,MMX> and audio pcm0: <CS423x> at port 0x534-0x537,0x388-0x38b,0x220-0x22f irq 5 drq 1,0 on isa0 although the board is set to 300MHz. The CPU is 300MHz. Either letting the board detect the cpu and setting core voltage, multiplier, bus freq, etc. , or setting the jumpers manually gives this output from freebsd at boot time. The BIOS detects the CPU correctly as 300MHz though, and displays this at boot time. Once, I got a message at boot time of (I paraphrase since I have not seen it again) RTC: error 20(config) I tried setting the cpu to different, lower frequencies, but the slow audio still happens, and the TSC frequency reported is always off by a factor of about 25%. Any idea what is really going on here ? Is it a bug of Cyrix CPUs (or CS4235)? Any way to force detection of the right frequency ? Any help greatly appreciated... bruno To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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