int
fdt_platform_load_dtb(void)
{
struct fdt_header *hdr;
const char *s;
char *p;
int rv;
/*
* If the U-boot environment contains a variable giving the address of a
* valid blob in memory, use it. The U-boot README says the right
* variable for fdt data loaded into ram is fdt_addr_r, so try that
* first. Board vendors also use both fdtaddr and fdt_addr names.
*/
s = ub_env_get("fdt_addr_r");
if (s == NULL)
s = ub_env_get("fdtaddr");
if (s == NULL)
s = ub_env_get("fdt_addr");
if (s != NULL && *s != '\0') {
hdr = (struct fdt_header *)strtoul(s, &p, 16);
if (*p == '\0') {
if (fdt_load_dtb_addr(hdr) == 0) {
printf("Using DTB provided by U-Boot at "
"address %p.\n", hdr);
return (0);
}
}
}
rv = 1;
/*
* Try to get FDT filename first from loader env and then from u-boot env
*/
s = getenv("fdt_file");
if (s == NULL)
s = ub_env_get("fdtfile");
if (s == NULL)
s = ub_env_get("fdt_file");
if (s != NULL && *s != '\0') {
if (fdt_load_dtb_file(s) == 0) {
printf("Loaded DTB from file '%s'.\n", s);
rv = 0;
}
}
if (rv == 0) {
s = getenv("fdt_overlays");
if (s == NULL)
s = ub_env_get("fdt_overlays");
if (s != NULL && *s != '\0') {
printf("Loading DTB overlays: '%s'\n", s);
fdt_load_dtb_overlays(s);
}
}
return (rv);
}
int
fdt_setup_fdtp()
{
struct preloaded_file *bfp;
vm_offset_t va;
debugf("fdt_setup_fdtp()\n");
/* If we already loaded a file, use it. */
if ((bfp = file_findfile(NULL, "dtb")) != NULL) {
if (fdt_load_dtb(bfp->f_addr) == 0) {
printf("Using DTB from loaded file '%s'.\n",
bfp->f_name);
return (0);
}
}
/* If we were given the address of a valid blob in memory, use it. */
if (fdt_to_load != NULL) {
if (fdt_load_dtb_addr(fdt_to_load) == 0) {
printf("Using DTB from memory address 0x%08X.\n",
(unsigned int)fdt_to_load);
return (0);
}
}
if (fdt_platform_load_dtb() == 0)
return (0);
/* If there is a dtb compiled into the kernel, use it. */
if ((va = fdt_find_static_dtb()) != 0) {
if (fdt_load_dtb(va) == 0) {
printf("Using DTB compiled into kernel.\n");
return (0);
}
}
command_errmsg = "No device tree blob found!\n";
return (1);
}
