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Dear all,
I am trying to make some UDMA transfer and when I try to make a writing
transfer of more than 1 sector (2 sectors
for example), using the DMA write command 0xCA, I have a device pause at
the end of the first sector (DMARQ not asserted), and I would like to
know why the device makes a pause. I am in UDMA mode 0, and I found only
one hdd, brand name Maxtor (31536H2, 5400 rpm), which accepts for
example a transfer of 20 sectors without saying someting (it starts
crying after a request of more of 70 sectors). All the seagate ones I
have makes a device pause directly after the first sector transfered.
Have you any idea of the device behaviour ?
Why does the device make some pause ? Why is it different, depending of
the brand name ?
Is there a way to avoid device pause ?
Thanks a lot for your help.
Stephane.
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