[PATCH 1/4] Convert CONFIG_KEEP_SERVERADDR to Kconfig

[Simon Glass]

This converts the following to Kconfig:
   CONFIG_KEEP_SERVERADDR

Drop the preprocessor usage also.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 README                       | 6 ------
 include/configs/sandbox.h    | 1 -
 net/Kconfig                  | 9 +++++++++
 net/arp.c                    | 5 ++---
 scripts/config_whitelist.txt | 1 -
 5 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/README b/README
index 056b717557b..eaf9170e952 100644
--- a/README
+++ b/README
@@ -1193,12 +1193,6 @@ The following options need to be configured:
 		server to contact when using the "tftboot" command.
 		(Environment variable "serverip")
 
-		CONFIG_KEEP_SERVERADDR
-
-		Keeps the server's MAC address, in the env 'serveraddr'
-		for passing to bootargs (like Linux's netconsole option)
-
-- Gateway IP address:
 		CONFIG_GATEWAYIP
 
 		Defines a default value for the IP address of the
diff --git a/include/configs/sandbox.h b/include/configs/sandbox.h
index cd7d99ec69c..1dd21d5e925 100644
--- a/include/configs/sandbox.h
+++ b/include/configs/sandbox.h
@@ -25,7 +25,6 @@
 #define CONFIG_SYS_BAUDRATE_TABLE	{4800, 9600, 19200, 38400, 57600,\
 					115200}
 
-#define CONFIG_KEEP_SERVERADDR
 #define CONFIG_UDP_CHECKSUM
 #define CONFIG_TIMESTAMP
 #define CONFIG_BOOTP_SERVERIP
diff --git a/net/Kconfig b/net/Kconfig
index 7a2d1450188..fb6420f9bbe 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -98,4 +98,13 @@ config SERVERIP_FROM_PROXYDHCP_DELAY_MS
 		receiving response from main DHCP server. Has no effect if
 		SERVERIP_FROM_PROXYDHCP is false.
 
+config KEEP_SERVERADDR
+	bool "Write the server's MAC address to 'serveraddr'"
+	default y if SANDBOX
+	help
+	  Keeps the server's MAC address, in the env 'serveraddr'
+	  for passing to bootargs (like Linux's netconsole option). If this is
+	  enabled, when an ARP reply is received, the server's IP address is
+	  written there.
+
 endif   # if NET
diff --git a/net/arp.c b/net/arp.c
index 1d06ed25722..0b086dc8d21 100644
--- a/net/arp.c
+++ b/net/arp.c
@@ -196,13 +196,12 @@ void arp_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
 		if (!arp_is_waiting())
 			break;
 
-#ifdef CONFIG_KEEP_SERVERADDR
-		if (net_server_ip.s_addr == net_arp_wait_packet_ip.s_addr) {
+		if (IS_ENABLED(CONFIG_KEEP_SERVERADDR) &&
+		    net_server_ip.s_addr == net_arp_wait_packet_ip.s_addr) {
 			char buf[20];
 			sprintf(buf, "%pM", &arp->ar_sha);
 			env_set("serveraddr", buf);
 		}
-#endif
 
 		reply_ip_addr = net_read_ip(&arp->ar_spa);
 
diff --git a/scripts/config_whitelist.txt b/scripts/config_whitelist.txt
index 6d961ccb3e6..3285d3cd30e 100644
--- a/scripts/config_whitelist.txt
+++ b/scripts/config_whitelist.txt
@@ -639,7 +639,6 @@ CONFIG_JFFS2_PART_SIZE
 CONFIG_JFFS2_SUMMARY
 CONFIG_JRSTARTR_JR0
 CONFIG_JTAG_CONSOLE
-CONFIG_KEEP_SERVERADDR
 CONFIG_KEY_REVOCATION
 CONFIG_KIRKWOOD_EGIGA_INIT
 CONFIG_KIRKWOOD_GPIO
-- 
2.34.1.173.g76aa8bc2d0-goog