+void arch_preboot_os(void);
+
+/**
+ * bootm_decomp_image() - decompress the operating system
+ *
+ * @comp: Compression algorithm that is used (IH_COMP_...)
+ * @load: Destination load address in U-Boot memory
+ * @image_start Image start address (where we are decompressing from)
+ * @type: OS type (IH_OS_...)
+ * @load_bug: Place to decompress to
+ * @image_buf: Address to decompress from
+ * @image_len: Number of bytes in @image_buf to decompress
+ * @unc_len: Available space for decompression
+ * @return 0 if OK, -ve on error (BOOTM_ERR_...)
+ */
+int bootm_decomp_image(int comp, ulong load, ulong image_start, int type,
+ void *load_buf, void *image_buf, ulong image_len,
+ uint unc_len, ulong *load_end);
+