bootloader: Do not obfuscate RAM if we are not doing image validation

No need to take this step if we are not doing image validation.  The
obfuscation only buys us a tiny bit of "security" anyways since the
main parts of flash are memory mapped, too.  This saves a little bit of
wake-up time when waking up from deep sleep when the
BOOTLOADER_SKIP_VALIDATE_IN_DEEP_SLEEP option is set.

Signed-off-by: Tim Nordell <tim.nordell@nimbelink.com>

components/bootloader_support/src/esp_image_format.c

@@ -225,7 +225,7 @@ static esp_err_t image_load(esp_image_load_mode_t mode, const esp_partition_pos_
     }
 
 #ifdef BOOTLOADER_BUILD
-    if (do_load) { // Need to deobfuscate RAM
+    if (do_load && ram_obfs_value[0] != 0 && ram_obfs_value[1] != 0) { // Need to deobfuscate RAM
         for (int i = 0; i < data->image.segment_count; i++) {
             uint32_t load_addr = data->segments[i].load_addr;
             if (should_load(load_addr)) {
@@ -403,6 +403,12 @@ static esp_err_t process_segment_data(intptr_t load_addr, uint32_t data_addr, ui
         return ESP_FAIL;
     }
 
+    if (checksum == NULL && sha_handle == NULL) {
+        memcpy((void *)load_addr, data, data_len);
+        bootloader_munmap(data);
+        return ESP_OK;
+    }
+
 #ifdef BOOTLOADER_BUILD
     // Set up the obfuscation value to use for loading
     while (ram_obfs_value[0] == 0 || ram_obfs_value[1] == 0) {