>> 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"
);
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