On Fri, 21 Jan 2000, Tony Frank (EPA) wrote:
> I think I could configure the card to use the range 0xd0000 - 0xd3fff
> for the SRAM and then 0xd4000 - 0xd5fff for the MMIO, thus having a
> continuous block between 0xd0000 and 0xd5fff that I might be able to
> allocate in one hit. This however seems to be a bit of a workaround.
I'm not sure how using 1 memory area is a workaround; from your driver
point of view you're just going to be assigning pointers in your softc to
physical memory addresses in that range no?
> Essentially I have been using the source from other drivers to try and
> understand how the system works, but I am yet to find one that allocates two
> sets of memory.
Thats what 'rid' is for; since you can probably ask the card what its
resources are you really don't need to use the ISA hint mechanism; you can
do something like this:
device foo0 at isa? port 0xa20
And let your probe routine dig the rest of the resources out of the
adpater and add them using bus_set_resource(), or you can be more tricky
and use a DEVICE_IDENTIFY method to look for any cards, add devices for
them and assign resources to them. This would net you a config entry
looking something like this:
device foo0
Anyhow, I can help you out with any of the newbus/resource questions you
may have. I've got the MCA versions of those boards and will add the
bus front ends to your driver when you've got it ready. I suggest you
split your driver into the driver proper, and the bus front ends:
if_foo_isa.c
if_foo.c
if_fooreg.h
if_foovar.h
etc...
> One other issue that I am wondering about is overriding settings
> provided in the config file. If I specify an IRQ of 11, when the card
> is programmed to use 9, the bus_alloc_resource will give back an IRQ
> value of 11, which causes problems later as the card is using 9. I
> can read the IRQ value that the card is set to, but I'm not sure on
> the correct procedure to request that specific IRQ for my driver?
In your probe routine you may use bus_set_resource(dev, SYS_RES_IRQ, 0,
irq#, 1);
This will override the IRQ that was specified in the config file; you
might want to do a test to see if the configured IRQ is different than the
board IRQ though.
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