Re: Quick question about IDEBUS

[Thomas Dodd <ted cypress com>]

Jim wrote:
> Hey all,
>  
> I managed to get my ServerWorks CSB5 Ide controller working. However, 
> it's still defaulting with a 33mhz idebus.  How can I tell which speeds 
> are supported?
IDEBUS refers to the speed of the buss the IDE controler is
connected to.

> lspci -vv shows:
>  
> 00:0f.1 IDE interface: ServerWorks CSB5 IDE Controller (rev 92) (prog-if 
> 82 [Master PriP])
>         Subsystem: ServerWorks CSB5 IDE Controller
>         Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- 
> ParErr- Stepping- SERR- FastB2B-
>         Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- 
> <TAbort- <MAbort- >SERR- <PERR-
>  
> Should I believe 66mhz is the cap for this IDE bus?  The drives are 

The controler is capable of runnin on a 66MHz bus, but is it
opn a 66MHz bus? Most are 32bit, 33MHz. Some high-end servers
have 64bit and 66MHz busses. Check the docs for you motherboard
and system if you'r not sure. 32bit, 33MHz is a safe bet though.

> ATA-100, i'm a bit confused.  Also, if I am going to set the idebus=100 
> or 66, how do I go about doing it?

That's the transfer speed of the drive to the controler and
is configured with hdparm.

> Finally, it looks like I have 2 ide controllers on board,  Can anyone 
> make sense of this log and guide me in the direction of making proper 
> use of my system's ide capabilities?  Here's the log:
>  
> Oct 29 08:39:43 staff kernel: ide: Assuming 33MHz system bus speed for 
> PIO modes; override with idebus=xx

Notice the wording. "33MHz system bus speed" SYSTEM BUS, not drive.

> Oct 29 08:39:43 staff kernel: CMD649: IDE controller on PCI bus 00 dev 18
> Oct 29 08:39:43 staff kernel: CMD649: chipset revision 2
> Oct 29 08:39:43 staff kernel: CMD649: not 100%% native mode: will probe 
> irqs later
> Oct 29 08:39:43 staff kernel:     ide0: BM-DMA at 0x2030-0x2037, BIOS 
> settings: hda:DMA, hdb:DMA
> Oct 29 08:39:43 staff kernel:     ide1: BM-DMA at 0x2038-0x203f, BIOS 
> settings: hdc:pio, hdd:pio

standard CMD649 controller for ide0 and ide1 (disks hda, hdb, hdc, hdd)
hda and hdb are using DMA modes, hdc an hdd are set for PIO modes.

> Oct 29 08:39:43 staff kernel: ServerWorks CSB5: IDE controller on PCI 
> bus 00 dev 79
> Oct 29 08:39:43 staff kernel: ServerWorks CSB5: chipset revision 146
> Oct 29 08:39:43 staff kernel: ServerWorks CSB5: not 100%% native mode: 
> will probe irqs later
> Oct 29 08:39:43 staff kernel:     ide2: BM-DMA at 0x2000-0x2007, BIOS 
> settings: hde:pio, hdf:pio
> Oct 29 08:39:43 staff kernel: ServerWorks CSB5: simplex device:  DMA 
> disabled
> Oct 29 08:39:43 staff kernel: ide3: ServerWorks CSB5 Bus-Master DMA 
> disabled (BIOS)
The ServerWorks CSB5 controller. ide2, with hde and hdf are set for PIO
in BIOS, so DMA is not used. DMA is also turned off on ide3 but
there are no devices attached to it.

> Oct 29 08:39:43 staff kernel: hda: MAXTOR 6L040J2, ATA DISK drive
> Oct 29 08:39:43 staff kernel: hdb: MAXTOR 6L080L4, ATA DISK drive

2 disks on the CMD646.

> Oct 29 08:39:43 staff kernel: hde: HL-DT-ST CD-ROM GCR-8480B, ATAPI 
> CD/DVD-ROM drive

one CDROM on the CSB5.

> Oct 29 08:39:43 staff kernel: hda: 78165360 sectors (40021 MB) w/1819KiB 
> Cache, CHS=77545/16/63, UDMA(100)
> Oct 29 08:39:43 staff kernel: hdb: 156355584 sectors (80054 MB) 
> w/1819KiB Cache, CHS=155114/16/63, UDMA(100)

hda and hdb, using UDMA(100) aka ATA-100.

	-Thomas