Commit 24acb83d authored by Prabhakar Kushwaha's avatar Prabhakar Kushwaha Committed by Simon Glass

common: Fix-up MAC addr in dts by fetching env variable serially

The MAC addresses get fixed in the device tree for "ethernet" nodes
is by using trailing number behind "ethernet" found in "/aliases".
It may not be necessary for the "ethernet" nodes to be sequential.
There can be gaps in between or any node disabled

So provide a support to fetch MAC addr sequentially from env
and apply them to "ethernet" nodes in the order they appear in
device tree only if "ethernet" is not "disabled"
Signed-off-by: Prabhakar Kushwaha's avatarPrabhakar Kushwaha <>
Reviewed-by: default avatarYork Sun <>
parent 48a34606
......@@ -1603,6 +1603,15 @@ The following options need to be configured:
See doc/ for more information.
- MAC address from environment variables
Fix-up device tree with MAC addresses fetched sequentially from
environment variables. This config work on assumption that
non-usable ethernet node of device-tree are either not present
or their status has been marked as "disabled".
- CDP Options:
......@@ -508,12 +508,16 @@ int fdt_fixup_memory(void *blob, u64 start, u64 size)
void fdt_fixup_ethernet(void *fdt)
int i, j, prop;
int i = 0, j, prop;
char *tmp, *end;
char mac[16];
const char *path;
unsigned char mac_addr[ARP_HLEN];
int offset;
int nodeoff;
const struct fdt_property *fdt_prop;
if (fdt_path_offset(fdt, "/aliases") < 0)
......@@ -526,7 +530,7 @@ void fdt_fixup_ethernet(void *fdt)
offset = fdt_first_property_offset(fdt,
fdt_path_offset(fdt, "/aliases"));
/* Select property number 'prop' */
for (i = 0; i < prop; i++)
for (j = 0; j < prop; j++)
offset = fdt_next_property_offset(fdt, offset);
if (offset < 0)
......@@ -535,11 +539,16 @@ void fdt_fixup_ethernet(void *fdt)
path = fdt_getprop_by_offset(fdt, offset, &name, NULL);
if (!strncmp(name, "ethernet", 8)) {
/* Treat plain "ethernet" same as "ethernet0". */
if (!strcmp(name, "ethernet"))
if (!strcmp(name, "ethernet")
|| !strcmp(name, "ethernet0")
i = 0;
i = trailing_strtol(name);
if (i != -1) {
if (i == 0)
strcpy(mac, "ethaddr");
......@@ -548,6 +557,14 @@ void fdt_fixup_ethernet(void *fdt)
} else {
nodeoff = fdt_path_offset(fdt, path);
fdt_prop = fdt_get_property(fdt, nodeoff, "status",
if (fdt_prop && !strcmp(fdt_prop->data, "disabled"))
tmp = env_get(mac);
if (!tmp)
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