[U-Boot-Users] Reading memory into environment variable

[mcj00_rubbish at f-m.fm]

Thanks for the help!

Using a proper U-Boot payload script would also be my preferred way, as
suggested by Detlev. However, this isn't my choice to make, it's an
accepted way of doing it already at my company :(

This patch looks about exactly like what I need. In fact I am using
U-Boot 1.2.0, so it's just perfect!

I am somewhat new to U-Boot development. What further work would be
required to bring this up to mainline U-Boot standard?

Thanks & regards,

Martin

On Fri, 4 Jul 2008 16:51:12 +0200, "Alessandro Rubini"
<rubini-list at gnudd.com> said:
> 
> >> 1. Read disk file into RAM
> >> 2. Implement custom "mem2env" command to read memory into environment
> >> variable, with destination variable as ${bootargs}
> 
> I've done the same (on u-boot-1.2.0) to read an upgrade script from a
> network file or usb pen. I called the command "setenvram" (bad choice,
> Wolfgang would refuse it).  I'm sure later I found something similar
> in mainline, but now I can't find it any more. I may have overlooked
> another command.
> 
> Although it's not ready for prime time, I paste it here.
> If useful I can make a proper patch against current git.
> 
> 
>     /* set environment variable from ram -- ARub */
>     int do_setenvram(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
>     {
> 	   unsigned long len, i;
> 	   char *addr;
>     
> 	   if (argc != 4) {
> 		   printf ("Usage:\n%s\n", cmdtp->usage);
> 		   return 1;
> 	   }
> 	   addr = (char *)simple_strtol(argv[2], NULL, 16);
> 	   len = simple_strtol(argv[3], NULL, 16);
> 	   if (!addr || !len) {
> 		   printf ("Usage:\n%s\n", cmdtp->usage);
> 		   return 1;
> 	   }
> 	   addr[len] = '\0';
> 	   for (i=0; i<len; i++) {
>                    /* turn newlines into semicolon */
> 		   if (addr[i]=='\n') addr[i] = ';';
>                    /* ignore dos-style newlines */
> 		   if (addr[i]=='\r') addr[i] = ' ';
>                    /* accept sh-comments and discard them */
> 		   if (addr[i]=='#') {
> 			   while (addr[i] && addr[i] != '\n')
> 				   addr[i++] = ' ';
> 			   i--;
> 		   }
> 	   }
> 	   setenv(argv[1], addr);
> 	   return 0;
>     }
>     
>     U_BOOT_CMD(
> 	   setenvram, 4, 0, do_setenvram,
> 	   "setenvram  - get environment variable from ram\n",
> 	   "name addr maxlen\n"
> 	   "    - set environment variable 'name' from addr 'addr'\n"
>     );  
>