Make the fxp driver work on alpha, rather than panic the machine on boot

and/or when using the card.

o Convert the driver to using bus_space.  This allows alphas with
fxp's to boot, rather than panic'ing because rman_get_virtual()
doesn't really return a virtual address on alphas.

o Fix an alpha unaligned access error caused by some misfeature of
gcc/egcs: if link_addr & rbd_addr in the fxp_rfa struct are 32 bit
quantities, egcs will assume they are naturally aligned. So it will do
a ldl & some shifty/masky to twiddle 16 bit values in fxp_lwcopy().
However, if they are 16-bit aligned, the ldl will actually be done on
a 16-bit aligned value & we will panic with an unaligned access
error... Changing their definition to an array of chars seems to fix
this.  I obtained this from NetBSD.

I've tested this on both i386 & alpha.

1 files changed, 2 insertions, 2 deletions

diff --git a/sys/pci/if_fxpreg.h b/sys/pci/if_fxpreg.h
index c9fb405..5580813 100644
--- a/sys/pci/if_fxpreg.h
+++ b/sys/pci/if_fxpreg.h
@@ -245,8 +245,8 @@ struct fxp_cb_tx {
 struct fxp_rfa {
 	volatile u_int16_t rfa_status;
 	volatile u_int16_t rfa_control;
-	volatile u_int32_t link_addr;
-	volatile u_int32_t rbd_addr;
+        volatile u_int8_t link_addr[4];
+        volatile u_int8_t rbd_addr[4];
 	volatile u_int16_t actual_size;
 	volatile u_int16_t size;
 };