spl: ymodem: Add support for loading gzip compressed uImage

Add support for gunzip-ing gzip-compressed uImages in the SPL Ymodem code.
Loading data over Ymodem can be gruelingly slow, gzip-ing the data can
reduce that aggravating slowness at least slightly (depends on the data,
u-boot.bin compresses to ~1/3 of it's original size on ARM64), hence add
optional support for decompressing gzip-compressed uImages.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Tom Rini <trini@konsulko.com>

diff --git a/common/spl/spl_ymodem.c b/common/spl/spl_ymodem.c
index 3b1bd71..577fdc6 100644 (file)
--- a/common/spl/spl_ymodem.c
+++ b/common/spl/spl_ymodem.c
@@ -69,12 +69,13 @@ static ulong ymodem_read_fit(struct spl_load_info *load, ulong offset,
 static int spl_ymodem_load_image(struct spl_image_info *spl_image,
                                 struct spl_boot_device *bootdev)
 {
-       int size = 0;
+       ulong size = 0;
        int err;
        int res;
        int ret;
        connection_info_t info;
        char buf[BUF_SIZE];
+       struct image_header *ih;
        ulong addr = 0;
 
        info.mode = xyzModem_ymodem;
@@ -107,12 +108,18 @@ static int spl_ymodem_load_image(struct spl_image_info *spl_image,
                while ((res = xyzModem_stream_read(buf, BUF_SIZE, &err)) > 0)
                        size += res;
        } else {
-               ret = spl_parse_image_header(spl_image,
-                                            (struct image_header *)buf);
+               ih = (struct image_header *)buf;
+               ret = spl_parse_image_header(spl_image, ih);
                if (ret)
                        return ret;
-               addr = spl_image->load_addr;
+#ifdef CONFIG_SPL_GZIP
+               if (ih->ih_comp == IH_COMP_GZIP)
+                       addr = CONFIG_SYS_LOAD_ADDR;
+               else
+#endif
+                       addr = spl_image->load_addr;
                memcpy((void *)addr, buf, res);
+               ih = (struct image_header *)addr;
                size += res;
                addr += res;
 
@@ -121,13 +128,25 @@ static int spl_ymodem_load_image(struct spl_image_info *spl_image,
                        size += res;
                        addr += res;
                }
+
+#ifdef CONFIG_SPL_GZIP
+               if (ih->ih_comp == IH_COMP_GZIP) {
+                       if (gunzip((void *)(spl_image->load_addr + sizeof(*ih)),
+                                  CONFIG_SYS_BOOTM_LEN,
+                                  (void *)(CONFIG_SYS_LOAD_ADDR + sizeof(*ih)),
+                                  &size)) {
+                               puts("Uncompressing error\n");
+                               return -EIO;
+                       }
+               }
+#endif
        }
 
 end_stream:
        xyzModem_stream_close(&err);
        xyzModem_stream_terminate(false, &getcymodem);
 
-       printf("Loaded %d bytes\n", size);
+       printf("Loaded %lu bytes\n", size);
        return 0;
 }
 SPL_LOAD_IMAGE_METHOD("UART", 0, BOOT_DEVICE_UART, spl_ymodem_load_image);