Built into my Amiga 4000 I've got a certain IDE controller for which I
want to write an appropiate driver.
The reason I write to this list and not the linux-m68k or linux-ppc list
is that my problem is not that machine dependent.
Having a closer look at the interrupts hooked into the native OS I found
out that this controller doesn't (!) set up an interrupt. Really.
A subprocess receives the file system commands, transfers the IDE commands
to the hard drive or CD-ROM and maybe hangs around in a busy-wait (!) loop
until the drive is ready to transfer data. The data transfer is done by
the same subprocess (no DMA) and presented back to the file system.
That's the problem. No interrupts.
The only way to do it under Linux is to implement the same scheme, meaning
a subprocess (kernel thread?) which does the actual transfer.
Any ideas apart from ditching the controller?
Carsten
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