update to 2015.04-rc1

[karo-tx-uboot.git] / README

diff --git a/README b/README
index a28ff133ee057c17af79a397e44325328f82dedf..a435c8b2fa7ce054530002b7d5d8f20f197710ad 100644 (file)
--- a/README
+++ b/README
@@ -2207,6 +2207,17 @@ CBFS (Coreboot Filesystem) support
                requests. Increasing this will allow U-Boot to accept offers
                from a BOOTP client in networks with unusually high latency.
 
+- BOOTP Random transaction ID:
+               CONFIG_BOOTP_RANDOM_ID
+
+               The standard algorithm to generate a DHCP/BOOTP transaction ID
+               by using the MAC address and the current time stamp may not
+               quite unlikely produce duplicate transaction IDs from different
+               clients in the same network. This option creates a transaction
+               ID using the rand() function. Provided that the RNG has been
+               seeded well, this should guarantee unique transaction IDs
+               always.
+
 - DHCP Advanced Options:
                You can fine tune the DHCP functionality by defining
                CONFIG_BOOTP_* symbols: