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-rw-r--r--doc/README.enetaddr6
-rw-r--r--net/eth.c14
2 files changed, 19 insertions, 1 deletions
diff --git a/doc/README.enetaddr b/doc/README.enetaddr
index 2d8e24f5cb4..1eaeaf9416e 100644
--- a/doc/README.enetaddr
+++ b/doc/README.enetaddr
@@ -32,7 +32,11 @@ Correct flow of setting up the MAC address (summarized):
1. Read from hardware in initialize() function
2. Read from environment in net/eth.c after initialize()
-3. Give priority to the value in the environment if a conflict
+3. The environment variable will be compared to the driver initialized
+ struct eth_device->enetaddr. If they differ, a warning is printed, and the
+ environment variable will be used unchanged.
+ If the environment variable is not set, it will be initialized from
+ eth_device->enetaddr, and a warning will be printed.
4. Program the address into hardware if the following conditions are met:
a) The relevant driver has a 'write_addr' function
b) The user hasn't set an 'ethmacskip' environment variable
diff --git a/net/eth.c b/net/eth.c
index d526264fa65..6290b332fd3 100644
--- a/net/eth.c
+++ b/net/eth.c
@@ -62,6 +62,15 @@ int eth_getenv_enetaddr_by_index(const char *base_name, int index,
return eth_getenv_enetaddr(enetvar, enetaddr);
}
+int eth_setenv_enetaddr_by_index(const char *base_name, int index,
+ uchar *enetaddr)
+{
+ char enetvar[32];
+ sprintf(enetvar, index ? "%s%daddr" : "%saddr", base_name, index);
+ return eth_setenv_enetaddr(enetvar, enetaddr);
+}
+
+
static int eth_mac_skip(int index)
{
char enetvar[15];
@@ -205,6 +214,11 @@ int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
}
memcpy(dev->enetaddr, env_enetaddr, 6);
+ } else if (is_valid_ether_addr(dev->enetaddr)) {
+ eth_setenv_enetaddr_by_index(base_name, eth_number,
+ dev->enetaddr);
+ printf("\nWarning: %s using MAC address from net device\n",
+ dev->name);
}
if (dev->write_hwaddr &&