Hi Guys,
We are developing a custom PC104 serial board to be plugged into
TS7250 PC104 bus. We want to make this board use the default ISA pnp
serial driver which comes with current kernel bits. Our board is
properly detected when plugged and set to use PC104 interrupts 6 and
7. However we also have to plug some additional PC104 (Isa) boards
that take control over all the available IRQ i.e. 5, 6, 7 and these
boards don't allow interrupt sharing. So we ran out of IRQs on PC104
bus to be used for our custom serial ports expansion card.
We have been wondering whether we could command kernel serial driver
to use DIO ports as interruption source instead of PC104 (IRQ_GPIO0)
ones (of course we should properly wire our serial card IRQ lines to
DIO port) . I understand that currently IRQ5 on PC104 comes actually
from DIO bus so we believe that this should be feasible.
I am assuming that the main issue would be to compile a kernel that
setup DIO port bits to be used as IRQ lines. In the past I have
written drivers to configure DIO ports to work as interruptions but
this is only a matter of setting the default values of some registers
so I don't think that should be necessary to create my own driver but
rather just tweaking something on kernel source files to set default
values of target registers (WHERE???).
Then I assuming that I should set serial to use int 19 (IRQ_GPIO0)
`>setserial /dev/ttyS2 irq 19' ???
Is this feasible?
I would really appreciate any suggestions/comments.
Thanks.
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