Attempt a PXE NBP boot as the TFTP test.

src/tests/dhcptest.c

 	return 0;
 }
 
-static int test_dhcp_tftp ( char *tftpname ) {
+static int test_dhcp_tftp ( struct net_device *netdev, char *tftpname ) {
 	union {
 		struct sockaddr_in sin;
 		struct sockaddr_tcpip st;
 	find_global_dhcp_ipv4_option ( DHCP_EB_SIADDR,
 				       &target.sin.sin_addr );
 
-	return test_tftp ( &target.st, tftpname );
+	return test_tftp ( netdev, &target.st, tftpname );
 }
 
 static int test_dhcp_boot ( struct net_device *netdev, char *filename ) {
 	} else if ( strncmp ( filename, "hello:", 6 ) == 0 ) {
 		return test_dhcp_hello ( &filename[6] );
 	} else {
-		return test_dhcp_tftp ( filename );
+		return test_dhcp_tftp ( netdev, filename );
 	}
 }
 

src/tests/tftptest.c

 #include <gpxe/udp.h>
 #include <gpxe/tftp.h>
 #include <gpxe/async.h>
+#include <gpxe/uaccess.h>
+#include "pxe.h"
 
-static void test_tftp_callback ( struct tftp_session *tftp __unused,
-				 unsigned int block __unused,
+static void test_tftp_callback ( struct tftp_session *tftp, unsigned int block,
 				 void *data, size_t len ) {
-	unsigned int i;
-	char c;
+	unsigned long offset = ( ( block - 1 ) * tftp->blksize );
+	userptr_t pxe_buffer = real_to_user ( 0, 0x7c00 );
 
-	for ( i = 0 ; i < len ; i++ ) {
-		c = * ( ( char * ) data + i );
-		if ( c == '\r' ) {
-			/* Print nothing */
-		} else if ( ( c == '\n' ) || ( c >= 32 ) || ( c <= 126 ) ) {
-			putchar ( c );
-		} else {
-			putchar ( '.' );
-		}
-	}	
+	copy_to_user ( pxe_buffer, offset, data, len );
 }
 
-int test_tftp ( struct sockaddr_tcpip *target, const char *filename ) {
+int test_tftp ( struct net_device *netdev, struct sockaddr_tcpip *target,
+		const char *filename ) {
 	struct tftp_session tftp;
+	int rc;
 
 	memset ( &tftp, 0, sizeof ( tftp ) );
 	udp_connect ( &tftp.udp, target );
 	tftp.filename = filename;
 	tftp.callback = test_tftp_callback;
 
-	return async_wait ( tftp_get ( &tftp ) );
+	printf ( "Fetching \"%s\" via TFTP\n", filename );
+	if ( ( rc = async_wait ( tftp_get ( &tftp ) ) ) != 0 )
+		return rc;
+
+	printf ( "Attempting PXE boot\n" );
+	pxe_netdev = netdev;
+	rc = pxe_boot();
+	printf ( "PXE NBP returned with status %04x\n", rc );
+	return 0;
 }