Date: Wed, 1 Sep 1999 10:00:10 -0400 From: "Chuck O'Donnell" <cao@bus.net> To: freebsd-mobile@freebsd.org Subject: sound card irq with pcm driver Message-ID: <19990901100010.C23976@bus.net>
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Another IRQ question... this time related to the built-in sound card.
The specs for a Dell Latitude CP (see below) say that IRQ 5 is
``Reserved; generated by the audio controller''. But then it also says
that IRQ 7 and 10 can be used for an audio controller is not used by
something else.
So I guess my question is twofold (the first one most critical):
1) Should I attach the pcm driver to IRQ 5 or is IRQ 5 reserved by the
hardware and pcm should be put on a different IRQ
2) When the specs say that IRQ 7 and 10 can be used for an audio
controller, are they referring to a separate piece of audio
hardware in addition to the built-in sound card, or are they
referring to a controller in the software sense?
I do have the pcm driver assigned to IRQ 5 right now and it does work,
but I would like to understand it better to avoid any surprises down
the road.
Thanks,
Chuck
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In case anyone is interested... Dell Latitude CP I/O map and IRQ
assignments:
I/O Map
0000-001F: DMA controller #1
0020-003F: Interrupt controller #1
0040-005F: System timers
0060-006F: Keyboard controller
0070-007F: RTC and NMI enable
0080-009F: DMA page registers
00A0-00BF: Interrupt controller #2
00C0-00DF: DMA controller #2
00F0-00FF: Math coprocessor
0170-0177: CD-ROM controller
01F0-01F7: Hard-disk drive controller
0210-0217: Audio controller
0220-022F: Audio controller
0270-0277: Fast IR
0376-0376: IDE controller
0378-037F: LPT1
0388-038B: VGA
03F0-03F7: Diskette controller
03F8-03FF: COM1
0530-0537: Audio board
0778-077R: ECO registers
ECE0-ECFF: USB controller
FFA0-FFAF: PCI-IDE bus registers
IRQ Line Assignments
IRQ0: Reserved; generated by the system timer
IRQ1: Reserved; generated by the keyboard controller to signal that
the keyboard output buffer is full
IRQ2: Reserved; generated internally by the interrupt controller to
enable IRQ8 through IRQ15
IRQ3: Available for use by a PC Card unless the built-in serial port
or infrared port is configured for COM2 (the default) or COM4
IRQ4: Available for use by a PC Card unless the built-in serial port
is configured for COM1 (the default) or COM3
IRQ5: Reserved; generated by the audio controller
IRQ6: Reserved; generated by the diskette drive controller to
indicate that the diskette drive requires the attention of
the microprocessor
IRQ7: Available for use by a PC Card or audio controller if the
built-in parallel port is disabled
IRQ8: Reserved; generated by the system I/O controller's RTC
IRQ9: Reserved; generated by the video controller
IRQ10: Available for use by a PC Card or audio controller unless the
C/Port Advanced Port Replicator or C/Dock Expansion Station
is attached
IRQ11: Generated by the USB and PC Card controllers; available for
use by a PC Card
IRQ12: Reserved; generated by the keyboard controller to indicate
that the output buffer of the integrated touchpad or external
PS/2 mouse is full
IRQ13: Reserved; generated by the internal math coprocessor
IRQ14: Reserved; generated by the hard-disk drive to indicate that
the drive requires the attention of the microprocessor
IRQ15: Reserved; generated by the CD-ROM drive in the modular bay to
indicate that the drive requires the attention of the
microprocessor
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