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); }