I'm still a little bit new to dt. I thought the bootargs in chosen
node will always apply when dt is enabled. It just took me some time
to figure out that u-boot 'bootargs' env will anyway overwrite the
one from chosen.
static int bootm_linux_fdt(int machid, bootm_headers_t *images)
{
......
fdt_chosen(*of_flat_tree, 1);
......
}
int fdt_chosen(void *fdt, int force)
{
......
/*
* Create /chosen properites that don't exist in the fdt.
* If the property exists, update it only if the "force" parameter
* is true.
*/
str = getenv("bootargs");
if (str != NULL) {
path = fdt_getprop(fdt, nodeoffset, "bootargs", NULL);
if ((path == NULL) || force) {
err = fdt_setprop(fdt, nodeoffset,
"bootargs", str, strlen(str)+1);
if (err < 0)
printf("WARNING: could not set bootargs %s.\n",
fdt_strerror(err));
}
}
......
}
The 'force' is hard-coded as 1, so it always overwrites. Knowing
that may save your some time, if you are green hands as me ;)
--
Regards,
Shawn
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