* @param base Base address of memory buffer
* @param size Size of memory buffer (-1 if unknown)
* @return 0 if unstashed ok, -ENOENT if bootstage info not found, -ENOSPC if
* @param base Base address of memory buffer
* @param size Size of memory buffer (-1 if unknown)
* @return 0 if unstashed ok, -ENOENT if bootstage info not found, -ENOSPC if