TI:am335x: Better comment and organize the networking related options

While in here, drop CONFIG_BOOTP_DEFAULT as it is unused in the code.

Signed-off-by: Tom Rini <trini@ti.com>

include/configs/am335x_evm.h

@@ -228,17 +228,24 @@
 /* SPL */
 #ifndef CONFIG_NOR_BOOT
 #define CONFIG_SPL_YMODEM_SUPPORT
+
+/* CPSW support */
+#define CONFIG_SPL_ETH_SUPPORT
+
+/* USB gadget RNDIS */
+#define CONFIG_SPL_MUSB_NEW_SUPPORT
+
+/* General network SPL, both CPSW and USB gadget RNDIS */
 #define CONFIG_SPL_NET_SUPPORT
 #define CONFIG_SPL_ENV_SUPPORT
 #define CONFIG_SPL_NET_VCI_STRING	"AM335x U-Boot SPL"
-#define CONFIG_SPL_ETH_SUPPORT
+
 #define CONFIG_SPL_SPI_SUPPORT
 #define CONFIG_SPL_SPI_FLASH_SUPPORT
 #define CONFIG_SPL_SPI_LOAD
 #define CONFIG_SPL_SPI_BUS		0
 #define CONFIG_SPL_SPI_CS		0
 #define CONFIG_SYS_SPI_U_BOOT_OFFS	0x20000
-#define CONFIG_SPL_MUSB_NEW_SUPPORT
 #define CONFIG_SPL_LDSCRIPT		"$(CPUDIR)/am33xx/u-boot-spl.lds"
 
 #ifdef CONFIG_NAND

include/configs/ti_am335x_common.h

@@ -28,18 +28,17 @@
 #define CONFIG_SYS_NS16550_CLK		48000000
 
 /* Network defines. */
-#define CONFIG_CMD_NET
+#define CONFIG_CMD_NET			/* 'bootp' and 'tftp' */
 #define CONFIG_CMD_DHCP
-#define CONFIG_CMD_PING
-#define CONFIG_DRIVER_TI_CPSW
-#define CONFIG_MII
-#define CONFIG_BOOTP_DEFAULT
-#define CONFIG_BOOTP_DNS
+#define CONFIG_BOOTP_DNS		/* Configurable parts of CMD_DHCP */
 #define CONFIG_BOOTP_DNS2
 #define CONFIG_BOOTP_SEND_HOSTNAME
 #define CONFIG_BOOTP_GATEWAY
 #define CONFIG_BOOTP_SUBNETMASK
 #define CONFIG_NET_RETRY_COUNT         10
+#define CONFIG_CMD_PING
+#define CONFIG_DRIVER_TI_CPSW		/* Driver for IP block */
+#define CONFIG_MII			/* Required in net/eth.c */
 
 /*
  * SPL related defines.  The Public RAM memory map the ROM defines the