"DMA limited to UDMA33" is there any knob?

Kris Kennaway kris at FreeBSD.org
Wed Aug 3 02:27:04 GMT 2005


On Tue, Aug 02, 2005 at 10:25:19PM -0400, Alexandre Sunny Kovalenko wrote:
> Good people,
> 
> on my system (7.0-CURRENT as of 7/24 18:42 EST) I receive following
> message during boot:
> 
> ad0: DMA limited to UDMA33, device found non-ATA66 cable
> ad0: 28615MB <IC25N030ATMR04 0 MOAOAD0A> at ata0-master UDMA33
> 
> Since there is no cable (drive attached directly to the connector
> mounted on the piece of PCB), I wonder whether there are any overriding
> knobs. ATA controller is VIA8235:
> 
> atapci0: <VIA 8235 UDMA133 controller> port
> 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xfc00-0xfc0f at device 17.1 on pci0
> 
> atapci0 at pci0:17:1:      class=0x01018a card=0x120514ff chip=0x05711106
> rev=0x06 hdr=0x00
>     vendor   = 'VIA Technologies Inc'
>     device   = 'VT82xxxx EIDE Controller (All VIA Chipsets)'
>     class    = mass storage
>     subclass = ATA
> 
> According to the data sheet drive is capable of UDMA100.
> 
> Any suggestions will be greatly appreciated.

You can try commenting out the cable check in the driver code.

Kris


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