The "rtems-libbsd" "if_atsam.c" driver is derived from the legacy one. What's
the status of the two drivers? I ask because I'm trying to do some small
memory testing with the legacy stack on the . It is building but not working,
I don't think network packets are going out even though the build is definitely
receiving broadcast packets because I see the number of incoming receive
interrupts increasing.
My first attempts crashed because the attach function unconditionally
de-referenced "config->hardware_address", most legacy drivers conditionalize
the de-reference. I modified the driver to do something similar to what the
"libbsd" driver does.
After that everything appears to work except networking isn't working. I put
the system on its own little section of a managed switch and I don't see any
packet activity. The app is running a shell with "netstat" and I can see the
count of receive interrupts going up.
Before I go much further I have a few questions.
- What's the usage of the "atsamv" driver? I know there are issues associated
with the external SRAM, clock speeds, and maybe clock references. But is the
legacy driver used, only the "libbsd" driver used, or neither?
Thanks -
Peter
**** The diffs I made to the driver are:
diff --git a/bsps/arm/atsam/net/if_atsam.c b/bsps/arm/atsam/net/if_atsam.c
index 9665aa1..5c84cdc 100644
--- a/bsps/arm/atsam/net/if_atsam.c
+++ b/bsps/arm/atsam/net/if_atsam.c
@@ -1181,6 +1181,10 @@ static int if_atsam_driver_attach(struct
rtems_bsdnet_ifconfig *config)
const if_atsam_config *conf = config->drv_ctrl;
int unitNumber;
char *unitName;
+ /* This is sort of what the libbsd library does for the lack of a MAC
address.
+ * except the final byte is 0x11 + unit.
+ */
+ static const uint8_t mac_addr[] = { 0x0e, 0xb0, 0xba, 0x5e, 0xba, 0x11 /*
+ unit */ };
if (conf != NULL) {
sc->Gmac_inst.retries = conf->mdio_retries;
@@ -1191,7 +1195,11 @@ static int if_atsam_driver_attach(struct
rtems_bsdnet_ifconfig *config)
}
/* The MAC address used */
- memcpy(sc->GMacAddress, config->hardware_address, ETHER_ADDR_LEN);
+ if (config->hardware_address) {
+ memcpy(sc->GMacAddress, config->hardware_address, ETHER_ADDR_LEN);
+ } else {
+ memcpy(sc->GMacAddress, mac_addr, ETHER_ADDR_LEN);
+ }
memcpy(sc->arpcom.ac_enaddr, sc->GMacAddress, ETHER_ADDR_LEN);
/*
*** Configuration command is:
../rtems/configure \
--target=arm-rtems5 \
--enable-rtemsbsp=atsamv \
--prefix=/opt/customer/rtems-5/ \
--enable-networking \
--enable-posix \
--disable-smp \
--disable-multiprocessing \
--enable-tests \
--enable-cxx \
--enable-maintainer-mode
Peter
-----------------
Peter Dufault
HD Associates, Inc. Software and System Engineering
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