Stanislaw Gruszka wrote:
do special things before access Task File and Data Register (functions
set_8bit_mode() and set_16bit_mode()).
That part really doesn't look well -- Atmel should have put more
though into it and make the register stride 2 bytes, so that 16-bit
access could alwys be used...
Actually it is possible (I realize when seeing pata_at32) when address
lines are connected in diffrent way, h/w trick is described in AVR32 ATA
application note. Only register addresses are multiplied by 2 then.
However Atmel reference documents for AT91 don't describe such
connection. I suppose AT91 evaluation boards are designed without the trick.
It's not much of a trick, just a usual way of connection a 16-bit
device... I'd advise that you pass the register stride info via the platform
data, alike to what pata_platform devices do.
We did not tests on Atmel sam9263ek board, because we have no proper connector
for 1,8'' HDD.
Not sure I've understood that. You have 1,8'' drive and the board has
stndard IDE connector?
Board has 44-pin male IDE connector (rather non standard one), we have no cable
I think it's pretty standard laptop connector.
or any device to connect. Kelvatek's board has Compact Flash connector, we use CF
card for testing. We currently ordered proper cable and IDE->CF adapter, so
I'll do tests on sam9263ek.
Besides, not all CF connectors are DMA compatible (don't have pin 43/44
wired for DMA).
MBR, Sergei
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