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Re: Is there any way to branch in Boot Script
- From: Sergei Gavrikov <w3sg at SoftHome dot net>
- To: ariga masahiro <ariga at link-lab dot co dot jp>
- Cc: ecos-discuss at ecos dot sourceware dot org
- Date: Wed, 18 Jul 2007 21:09:07 +0300
- Subject: Re: [ECOS] Is there any way to branch in Boot Script
- References: <001901c7c845$567efd10$1c0110ac@ariga>
On Tue, Jul 17, 2007 at 04:37:33PM +0900, ariga masahiro wrote:
> Hi,Everyone,
>
> I beseech you to help me out of next predicament.
>
> What I want to do is this:
> In RedBoot Boot Script,read Target Board DIPSW-settled value,
> and compare already-written value in a certain address.
> ã(for example,use mcmp command)
> If same, continue next Boot Script command.
> If differs,quit Boot Script and return to RedBoot's prompt.
>
> My questions are:
> 1.Is there any way to know mcmp result(that is ,succeeded or errored).
> Preferably in RedBoot Boot Script.
> ã2.Is there any way to use branching statement(like,if-else),
> in RedBoot Boot Script
It's pity, but RedBoot != shell, so it hasn't such behaviours. Some guys
dream about those behaviours :-) But, every RedBoot command (redboot.h)
is just it
typedef void cmd_fun(int argc, char *argv[]);
Therefore, it is no way to return any result (Ups, I did think about
`argv' :). Also, there is no global variable, something like the DOS
`errorlevel' (to check/collect the fails) there. More that, if the
RedBoot's parser does meet wrong line in a script, it passes the line a
bit noisely and then it continues to parse a rest of the script.
> 3.Is there any way to realize above-mentioned "what I want to do".
I had same needs (to read the DIP switches). And I did use such a way.
Well, if your RedBoot/eCos aren't fucked binaries, i.e. if you have the
target sources, you can put same stuff in your plf_misc.c file
---------------------------------------------------------->8
#include <pkgconf/system.h>
#ifdef CYGPKG_REDBOOT
#include <redboot.h> // script declaration
#define DIPSW_MASK (1 << 7) // FIXME: put yours
#ifdef CYGSEM_REDBOOT_PLF_STARTUP
void
cyg_plf_redboot_startup (void)
{
int switches = 0;
// put a code to read the switches here
if (switches & DIPSW_MASK)
// don't run the script
script = 0;
}
#endif // CYGSEM_REDBOOT_PLF_STARTUP
#endif // CYGPKG_REDBOOT
---------------------------------------------------------->8
Note: before to build RedBoot with this tweak, set this option in your
`ecos.ecc':
cdl_option CYGSEM_REDBOOT_PLF_STARTUP {user_value 1};
For more details, look at cyg_start () in redboot/current/src/main.c,
you would find your own way for that.
Sergei
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