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Re: cdrom as slave
On Tue, 27 May 1997, Doron Zifrony wrote:
>>>disks and ATAPI CDs are legal. For example, a slave can't be configured
>> ^^^^^^^^^^^^^^^^^^^^^^^^^^
>>>in itself on the same IDE controller without a master.
>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> I have a hard disk as hda, nothing as hdb and hdc and the CD-ROM drive
>>as hdd. The controller is the on-board circuit of my Tyan motherboard.
>>
>> So, a master without slave on the first channel and a slave without
>>a master on the second channel.
>Are you sure that the CD-ROM is configured as a slave. It is permissable,
>according to the standard to have one IDE disk on the primary cable and
>an ATAPI CD-ROM on the secondary cable, when it is the master on the second
>cable.
Ok. I agree that it seems bizarre that the CD-ROM drive is slave sans master
but that works on this motherboard. By the way, that Tomcat II motherboard has
an Intel HX Triton chipset.
Here is from the Linux boot message
-------------------------------
PIIX3: bus-master IDE device on PCI bus 0 function 57
ide0: BM-DMA at 0xf000-0xf007
ide0 master/slave: sample_CLKs=3, recovery_CLKs=1
master: fastDMA=yes PreFetch=on IORDY=on fastPIO=on
slave : fastDMA=no PreFetch=off IORDY=off fastPIO=off
ide1: BM-DMA at 0xf008-0xf00f
ide1 master: sample_CLKs=5, recovery_CLKs=4
master: fastDMA=no PreFetch=off IORDY=off fastPIO=off
slave : sample_CLKs=3, recovery_CLKs=3
slave : fastDMA=yes PreFetch=on IORDY=on fastPIO=on
hda: Maxtor 85120 A8 -, ATA DISK drive
hdb: probing with STATUS instead of ALTSTATUS
hdb: probing with STATUS instead of ALTSTATUS
hdd: NEC CD-ROM DRIVE:251, ATAPI CDROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: DMA disabled
hda: Maxtor 85120 A8 -, 4884MB w/256kB Cache, LBA, CHS=622/255/63
hdd: DMA disabled
Started kswapd v 1.23
hdd: media changed
hdd: ATAPI CDROM changer with 4 slots
-------------------------------
You gotta love these verbose status messages.
alex
References: