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

[Zubair Lutfullah Kakakhel]

Hi,

On 09/08/2016 09:23 AM, Zubair Lutfullah Kakakhel wrote:
> 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
argc = 3
> argv[0] = "0xffffffff88000000"
argv[1] = 123
argv[2] = 321

Copy paste fluke in the git log. Sorry.
The above appears in reality

Regards,
ZubairLK

> 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)) {
>