Revert "boot cmds: convert to getenv_yesno() with autostart"

This reverts commit 5a442c0a.

This commit changed the behaviour of getenv_yesno() (both the default
behaviour and the documented behaviour for abbreviated arguments)
which resulted in problems in several areas.
Signed-off-by: NWolfgang Denk <wd@denx.de>

common/cmd_fdc.c

@@ -721,6 +721,7 @@ int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	image_header_t *hdr;  /* used for fdc boot */
 	unsigned char boot_drive;
 	int i,nrofblk;
+	char *ep;
 	int rcode = 0;
 #if defined(CONFIG_FIT)
 	const void *fit_hdr = NULL;
@@ -823,7 +824,7 @@ int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	load_addr = addr;
 
 	/* Check if we should attempt an auto-start */
-	if (getenv_yesno("autostart")) {
+	if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
 		char *local_args[2];
 
 		local_args[0] = argv[0];

common/cmd_fdos.c

@@ -99,7 +99,7 @@ int do_fdosboot(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	   size, load_addr);
 
     /* Check if we should attempt an auto-start */
-    if (getenv_yesno("autostart")) {
+    if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
 	char *local_args[2];
 	local_args[0] = argv[0];
 	local_args[1] = NULL;

common/cmd_ide.c

@@ -496,7 +496,7 @@ int do_diskboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	load_addr = addr;
 
 	/* Check if we should attempt an auto-start */
-	if (getenv_yesno("autostart")) {
+	if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
 		char *local_args[2];
 
 		local_args[0] = argv[0];

common/cmd_nand.c

@@ -711,7 +711,7 @@ static int nand_load_image(cmd_tbl_t *cmdtp, nand_info_t *nand,
 			   ulong offset, ulong addr, char *cmd)
 {
 	int r;
-	char *s;
+	char *ep, *s;
 	size_t cnt;
 	image_header_t *hdr;
 #if defined(CONFIG_FIT)
@@ -787,7 +787,7 @@ static int nand_load_image(cmd_tbl_t *cmdtp, nand_info_t *nand,
 	load_addr = addr;
 
 	/* Check if we should attempt an auto-start */
-	if (getenv_yesno("autostart")) {
+	if (((ep = getenv("autostart")) != NULL) && (strcmp(ep, "yes") == 0)) {
 		char *local_args[2];
 
 		local_args[0] = cmd;

common/cmd_net.c

@@ -211,7 +211,7 @@ netboot_common (proto_t proto, cmd_tbl_t *cmdtp, int argc, char * const argv[])
 	flush_cache(load_addr, size);
 
 	/* Loading ok, check if we should attempt an auto-start */
-	if (getenv_yesno("autostart")) {
+	if (((s = getenv("autostart")) != NULL) && (strcmp(s,"yes") == 0)) {
 		char *local_args[2];
 		local_args[0] = argv[0];
 		local_args[1] = NULL;

common/cmd_scsi.c

@@ -327,7 +327,7 @@ int do_scsiboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	flush_cache (addr, (cnt+1)*info.blksz);
 
 	/* Check if we should attempt an auto-start */
-	if (getenv_yesno("autostart")) {
+	if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
 		char *local_args[2];
 		local_args[0] = argv[0];
 		local_args[1] = NULL;

common/cmd_usb.c

@@ -488,7 +488,7 @@ int do_usbboot(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	flush_cache(addr, (cnt+1)*info.blksz);
 
 	/* Check if we should attempt an auto-start */
-	if (getenv_yesno("autostart")) {
+	if (((ep = getenv("autostart")) != NULL) && (strcmp(ep, "yes") == 0)) {
 		char *local_args[2];
 		local_args[0] = argv[0];
 		local_args[1] = NULL;