ARM: tegra: implement bootcmd_pxe

This retrieves a PXE config file over the network, and executes it. This
allows an extlinux config file  to be retrieved over the network and
executed, whereas the existing bootcmd_dhcp retrieves a U-Boot script.
Signed-off-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NTom Warren <twarren@nvidia.com>

include/configs/tegra-common-post.h

@@ -66,6 +66,20 @@
 #define BOOT_TARGETS_DHCP ""
 #endif
 
+#if defined(CONFIG_CMD_DHCP) && defined(CONFIG_CMD_PXE)
+#define BOOTCMDS_PXE \
+	"bootcmd_pxe=" \
+		BOOTCMD_INIT_USB \
+		"dhcp; " \
+		"if pxe get; then " \
+			"pxe boot; " \
+		"fi\0"
+#define BOOT_TARGETS_PXE "pxe"
+#else
+#define BOOTCMDS_PXE ""
+#define BOOT_TARGETS_PXE ""
+#endif
+
 #define BOOTCMDS_COMMON \
 	"rootpart=1\0" \
 	\
@@ -108,6 +122,7 @@
 	"boot_targets=" \
 		BOOT_TARGETS_MMC " " \
 		BOOT_TARGETS_USB " " \
+		BOOT_TARGETS_PXE " " \
 		BOOT_TARGETS_DHCP " " \
 		"\0" \
 	\
@@ -117,7 +132,8 @@
 	\
 	BOOTCMDS_MMC \
 	BOOTCMDS_USB \
-	BOOTCMDS_DHCP
+	BOOTCMDS_DHCP \
+	BOOTCMDS_PXE
 
 #define CONFIG_BOOTCOMMAND \
 	"set usb_need_init; " \

include/configs/tegra114-common.h

@@ -46,6 +46,9 @@
  * scriptaddr can be pretty much anywhere that doesn't conflict with something
  *   else. Put it above BOOTMAPSZ to eliminate conflicts.
  *
+ * pxefile_addr_r can be pretty much anywhere that doesn't conflict with
+ *   something else. Put it above BOOTMAPSZ to eliminate conflicts.
+ *
  * kernel_addr_r must be within the first 128M of RAM in order for the
  *   kernel's CONFIG_AUTO_ZRELADDR option to work. Since the kernel will
  *   decompress itself to 0x8000 after the start of RAM, kernel_addr_r
@@ -63,6 +66,7 @@
  */
 #define MEM_LAYOUT_ENV_SETTINGS \
 	"scriptaddr=0x90000000\0" \
+	"pxefile_addr_r=0x90100000\0" \
 	"kernel_addr_r=0x81000000\0" \
 	"fdt_addr_r=0x82000000\0" \
 	"ramdisk_addr_r=0x82100000\0"

include/configs/tegra20-common.h

@@ -44,6 +44,9 @@
  * scriptaddr can be pretty much anywhere that doesn't conflict with something
  *   else. Put it above BOOTMAPSZ to eliminate conflicts.
  *
+ * pxefile_addr_r can be pretty much anywhere that doesn't conflict with
+ *   something else. Put it above BOOTMAPSZ to eliminate conflicts.
+ *
  * kernel_addr_r must be within the first 128M of RAM in order for the
  *   kernel's CONFIG_AUTO_ZRELADDR option to work. Since the kernel will
  *   decompress itself to 0x8000 after the start of RAM, kernel_addr_r
@@ -61,6 +64,7 @@
  */
 #define MEM_LAYOUT_ENV_SETTINGS \
 	"scriptaddr=0x10000000\0" \
+	"pxefile_addr_r=0x10100000\0" \
 	"kernel_addr_r=0x01000000\0" \
 	"fdt_addr_r=0x02000000\0" \
 	"ramdisk_addr_r=0x02100000\0"

include/configs/tegra30-common.h

@@ -43,6 +43,9 @@
  * scriptaddr can be pretty much anywhere that doesn't conflict with something
  *   else. Put it above BOOTMAPSZ to eliminate conflicts.
  *
+ * pxefile_addr_r can be pretty much anywhere that doesn't conflict with
+ *   something else. Put it above BOOTMAPSZ to eliminate conflicts.
+ *
  * kernel_addr_r must be within the first 128M of RAM in order for the
  *   kernel's CONFIG_AUTO_ZRELADDR option to work. Since the kernel will
  *   decompress itself to 0x8000 after the start of RAM, kernel_addr_r
@@ -60,6 +63,7 @@
  */
 #define MEM_LAYOUT_ENV_SETTINGS \
 	"scriptaddr=0x90000000\0" \
+	"pxefile_addr_r=0x90100000\0" \
 	"kernel_addr_r=0x81000000\0" \
 	"fdt_addr_r=0x82000000\0" \
 	"ramdisk_addr_r=0x82100000\0"