ATA anomaly Question
Matthew Dillon
dillon at apollo.backplane.com
Sat Mar 19 10:45:27 PST 2005
:
:Testing various PATA & SATA controllers under DragonFlyBSD 1.1 STABLE of
:15 March:
:
:- Anomalies:
:
:Add-on controllers, SATA:
:
:- booting may report in dmesg: 'DMA limited to UDMA 33, non-ATA66 cable
:or device'
:
:None of the SATA controllers under test have PATA ports.
Just ignore it. It's because our ATA driver isn't really all that
SATA-aware, so it is doing certain ATA checks that don't apply to
SATA. The SATA controller ignores it.
:Same message can also occur with actual PATA controllers when the cable
:is a proper UDMA-100,'
:and can do so erratically when different 'race' of UDMA-100 drives are
:on same cables as Master/Slave.
:..
:Bill
Typically the cable is reversed (motherboard side is connected to the
drive and the drive side is connected to the motherboard) when the
message occurs for a standard PATA drive and the cable is
UDMA-capable.
-Matt
Matthew Dillon
<dillon at xxxxxxxxxxxxx>
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