[U-Boot] [RFC] bootm: fix passing argc to standalone apps

[Zubair Lutfullah Kakakhel]

This bug appears in b6396403 which makes u-boot unable to pass
arguments via bootm to a standalone application without this patch.

Steps to reproduce.

Compile a u-boot. Use mkimage to package the standalone hello_world.bin
file.

e.g. For the MIPS Boston platform

mkimage -n "hello" -A mips -O u-boot -C none -T standalone \
     -a 0xffffffff80200000 -d hello_world.bin \
     -ep 0xffffffff80200000 hello_out

Then tftp hello_out and run it using

boston # dhcp 192.168.154.45:hello_out
...
boston # bootm $loadaddr 123 321

Without the patch the following output is observed.

Example expects ABI version 8
Actual U-Boot ABI version 8
Hello World
argc = 0
argv[0] = "0xffffffff88000000"

With the patch, you see the following.

boston # bootm $loadaddr 123 321
   Image Name:   hello
   Image Type:   MIPS U-Boot Standalone Program (uncompressed)
   Data Size:    1240 Bytes = 1.2 KiB
   Load Address: 80200000
   Entry Point:  80200000
   Verifying Checksum ... OK
   Loading Standalone Program ... OK
Example expects ABI version 8
Actual U-Boot ABI version 8
Hello World
argc = 0
argv[0] = "0xffffffff88000000"
Hit any key to exit ...

The go command at the entry point seems to work.

boston # go 0xffffffff80200000 123 321
Example expects ABI version 8
Actual U-Boot ABI version 8
Hello World
argc = 3
argv[0] = "0xffffffff80200000"
argv[1] = "123"
argv[2] = "321"
argv[3] = "<NULL>"
Hit any key to exit ...

Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel at imgtec.com>

---

Tested on the MIPS Boston platform.
---
 common/bootm.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/common/bootm.c b/common/bootm.c
index a4d22a6..b2c0912 100644
--- a/common/bootm.c
+++ b/common/bootm.c
@@ -619,10 +619,8 @@ int do_bootm_states(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[],
 	if (!ret && (states & BOOTM_STATE_FINDOS))
 		ret = bootm_find_os(cmdtp, flag, argc, argv);
 
-	if (!ret && (states & BOOTM_STATE_FINDOTHER)) {
+	if (!ret && (states & BOOTM_STATE_FINDOTHER))
 		ret = bootm_find_other(cmdtp, flag, argc, argv);
-		argc = 0;	/* consume the args */
-	}
 
 	/* Load the OS */
 	if (!ret && (states & BOOTM_STATE_LOADOS)) {
-- 
1.9.1