ofw_getprop
ofw_getprop(chosenh, "stdin", &stdinh, sizeof(stdinh));
ofw_getprop(chosenh, "stdout", &stdouth, sizeof(stdouth));
ofw_getprop(chosenh, "bootargs", bootargs, sizeof(bootargs));
ofw_getprop(chosenh, "bootpath", bootpath, sizeof(bootpath));
static int ofw_getprop(ofwh_t, const char *, void *, size_t);
OFWMETHOD(ofw_getprop, ofw_fdt_getprop),
OFWMETHOD(ofw_getprop, ofw_std_getprop),
OFWMETHOD(ofw_getprop, ofw_real_getprop),
int ofw_getprop(int, phandle_t, const char *, void *, int);