I'm trying to write an ISA device driver from scratch and I'm also trying to
make it a kernel loadable to make my debugging life easier. I started with
/usr/share/examples/kld/cdev and have modified it by adding the following:
static int
xxx_isa_probe(device_t dev)
{
int ret = ENXIO;
device_printf(dev,"xxx_isa_probe() called.\n");
if(device_get_unit(dev) == 0) {
ret = 0;
}
return ret;
}
static int
xxx_isa_attach(device_t dev)
{
device_printf(dev,"xxx_isa_attach() called.\n");
return 0;
}
static int
xxx_isa_detach(device_t dev)
{
device_printf(dev,"xxx_isa_detach() called.\n");
return 0;
}
static struct isa_pnp_id xxx_ids[] = {
{ 0, NULL }
};
static device_method_t xxx_isa_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, xxx_isa_probe),
DEVMETHOD(device_attach, xxx_isa_attach),
DEVMETHOD(device_detach, xxx_isa_detach),
{ 0, 0 }
};
static driver_t xxx_isa_driver = {
driver_name,
xxx_isa_methods,
0
};
static devclass_t xxx_devclass;
/* Declare the module to the system */
DRIVER_MODULE(xxx, isa, xxx_isa_driver, xxx_devclass, cdev_load, 0);
When I load the skeletion on my development machine (FreeBSD 4.4) both
cdev_load() and xxx_isa_probe() are called as expected. However when I load
the same binary on my PicoBSD target it only cdev_load() is called, *NOT*
xxx_isa_probe(). My PicoBSD is built from the same sources as my
development machine and both are FreeBSD 4.4-release. Both include the isa
bus in their configuration files. I'm sure I'm doing something wrong as I
have been able to load stock Ethernet driver kernel modules on Pico before.
Any suggestions ? I'm lost. I tried removing the stripping step in the
PicoBSD build thinking that was on obvious difference between a Pico build
and a full build, but that didn't help.
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