The CFG_ADDR has to be written before reading or writing the CFG_DATA.
---
freebsd/sys/powerpc/mpc85xx/pci_mpc85xx.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/freebsd/sys/powerpc/mpc85xx/pci_mpc85xx.c
b/freebsd/sys/powerpc/mpc85xx/pci_mpc85xx.c
index 47879e68..b479eb33 100644
--- a/freebsd/sys/powerpc/mpc85xx/pci_mpc85xx.c
+++ b/freebsd/sys/powerpc/mpc85xx/pci_mpc85xx.c
@@ -80,6 +80,7 @@ __FBSDID("$FreeBSD$");
#include <powerpc/mpc85xx/mpc85xx.h>
#ifdef __rtems__
#include <rtems/score/memory.h>
+#include <libcpu/powerpc-utility.h>
#endif /* __rtems__ */
#define REG_CFG_ADDR 0x0000
@@ -460,6 +461,9 @@ fsl_pcib_cfgread(struct fsl_pcib_softc *sc, u_int bus,
u_int slot, u_int func,
mtx_lock_spin(&sc->sc_cfg_mtx);
bus_space_write_4(sc->sc_bst, sc->sc_bsh, REG_CFG_ADDR, addr);
+#ifdef __rtems__
+ ppc_enforce_in_order_execution_of_io();
+#endif
switch (bytes) {
case 1:
@@ -498,6 +502,9 @@ fsl_pcib_cfgwrite(struct fsl_pcib_softc *sc, u_int bus,
u_int slot, u_int func,
mtx_lock_spin(&sc->sc_cfg_mtx);
bus_space_write_4(sc->sc_bst, sc->sc_bsh, REG_CFG_ADDR, addr);
+#ifdef __rtems__
+ ppc_enforce_in_order_execution_of_io();
+#endif
switch (bytes) {
case 1:
--
2.35.3
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