Can I use the system call provided by uboot in an assembly language program as in ppcbug?

Can I use the system call provided by uboot in an assembly language program as in ppcbug?

[Zhang Xin-W22390]

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Hello,
I want to call some system calls to do input/ouput in assembly language
program, and does uboot provide such syscall? As in PPCBUG, I can
program the following code:
  li r10,0x0022
  sc
to do an output to console.
 
I know I can program a standalone application using printf() to achieve
this function, as illustrated by the example uboot provides. Instead, I
want to use assembly language. 
 
Thanks and Regards.
 
Zhang Xin
MOTO Networks CDC
Phone: 86 10 58830720
 

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Re: Can I use the system call provided by uboot in an assembly language program as in ppcbug?

[Wolfgang Denk]

In message <917BB953409D9D4E86FDD8AE553CA873214B24@zmy16exm62.ds.mot.com> you wrote:
> 
> I want to call some system calls to do input/ouput in assembly language
> program, and does uboot provide such syscall? As in PPCBUG, I can

If you are running in  the  U-Boot  environment,  then  you  can  use
standard  C programs; read about "standalone applications" - but this
is off topic here; please  read  the  docs  and  post  any  remaining
questions on the u-boot-users mailing list.

Once you started the Linux kernel, then all of  U-Boot  is  gone  and
dead and there is no way to call any U-Boot code any more - except by
resetting the board.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
Of course there's no reason for it, it's just our policy.