> But when we see a CF card on a *SATA* controller, we *know* there's a bridge
> chip
> in there someplace, and we know that the common bridges don't do MWDMA.
If we see CF on SATA we already should kill the MWDMA modes as we'll see
word 95 showing SATA if the bridge is properly implemented. I g
Alan Cox wrote:
The solution is beginning to look more and more obvious: default to not use
MDMA
modes for CF devices at boot. And eventually provide a sysfs or libata
parameter
(or support/snoop SET_XFER_MODE) to change the mode later.
I strongly disagree.
We need to understand *why*, we
> The solution is beginning to look more and more obvious: default to not use
> MDMA
> modes for CF devices at boot. And eventually provide a sysfs or libata
> parameter
> (or support/snoop SET_XFER_MODE) to change the mode later.
I strongly disagree.
We need to understand *why*, we need to f
Alan Cox wrote:
I've acquired a new CF card that is capable of UDMA2, and with the same
connectors, wiring and adaptor (i.e. I popped out the MWDMA card and
inserted the UDMA one), I can now boot and read data on both devices
without error at reasonable speeds.
Fascinating. Does point more to
Alan Cox wrote:
I've acquired a new CF card that is capable of UDMA2, and with the same
connectors, wiring and adaptor (i.e. I popped out the MWDMA card and
inserted the UDMA one), I can now boot and read data on both devices
without error at reasonable speeds.
Fascinating. Does point more t
> I've acquired a new CF card that is capable of UDMA2, and with the same
> connectors, wiring and adaptor (i.e. I popped out the MWDMA card and
> inserted the UDMA one), I can now boot and read data on both devices
> without error at reasonable speeds.
Fascinating. Does point more to a driver
Alan Cox wrote:
Sounds to me like the usual case of people putting CF convertors onto
spec compliant cables and ending up with electrical problems. If you
stick additional connectors, wires and plugs onto the cable it goes out
of spec.
I've got reasonable evidence now that this is not the case.
Mark Lord wrote:
Malcolm Gillies wrote:
2) the HD runs error-free at UDMA/33 when I use a different, PIO-only
CF card but otherwise the same cabling, adaptor etc.
It would be useful to see the boot log for this scenario.
In particular, I'm curious what timings get chosen for the two devices.
B
> I don't think we can safely assume that UDMA can co-operate with non-UDMA
> on the same cable. In this case, it might be causing the CF device to falsely
> detect control cycles.
Improbable and never observed. The PIO address setup timing requires care
but not the rest, and especially not UDMA
Malcolm Gillies wrote:
Mark Lord wrote:
Malcolm Gillies wrote:
By swapping around components, I've established that the problem is
unlikely due to the cable (which is 50cm long 80-wire), hard disk or
controller. When I swap to another, slower CF card (one that only
supports PIO rather than MW
Mark Lord wrote:
Malcolm Gillies wrote:
By swapping around components, I've established that the problem is
unlikely due to the cable (which is 50cm long 80-wire), hard disk or
controller. When I swap to another, slower CF card (one that only
supports PIO rather than MWDMA), the error goes awa
Malcolm Gillies wrote:
My PATA hard disk is crippled by CRC errors when it's on the same cable
as a 1GB SanDisk Ultra II CompactFlash card in CF to IDE adaptor. Any
ideas why?
By swapping around components, I've established that the problem is
unlikely due to the cable (which is 50cm long 80-
On Sat, 18 Aug 2007 17:00:35 +1000
Malcolm Gillies <[EMAIL PROTECTED]> wrote:
> My PATA hard disk is crippled by CRC errors when it's on the same cable
> as a 1GB SanDisk Ultra II CompactFlash card in CF to IDE adaptor. Any
> ideas why?
I would guess the resulting pipe of cables and bits means
Having the dual-slot CF-IDE adapter AND a hard disk means you have 3 devices
there whether you plug something into the slot or not.
You'd get the same error if you had a 3-way IDE cable :)
Just move the CF adapter to a different cable, or the hard disk to a different
cable, and it'll be fine.
-
My PATA hard disk is crippled by CRC errors when it's on the same cable
as a 1GB SanDisk Ultra II CompactFlash card in CF to IDE adaptor. Any
ideas why?
By swapping around components, I've established that the problem is
unlikely due to the cable (which is 50cm long 80-wire), hard disk or
con
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