spl: Add an option to load a FIT containing U-Boot from UART

This provides a way to load a FIT containing U-Boot and a selection of device
tree files from UART.

Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>

diff --git a/common/spl/spl_ymodem.c b/common/spl/spl_ymodem.c
index 4f26ea5d21d94dc9a24858fd66780325ebb534b3..5402301c7832e728c5a228f0dfb5b192e7f45208 100644 (file)
--- a/common/spl/spl_ymodem.c
+++ b/common/spl/spl_ymodem.c
@@ -14,15 +14,60 @@
 #include <xyzModem.h>
 #include <asm/u-boot.h>
 #include <asm/utils.h>
+#include <libfdt.h>
 
 #define BUF_SIZE 1024
 
+/*
+ * Information required to load image using ymodem.
+ *
+ * @image_read: Now of bytes read from the image.
+ * @buf: pointer to the previous read block.
+ */
+struct ymodem_fit_info {
+       int image_read;
+       char *buf;
+};
+
 static int getcymodem(void) {
        if (tstc())
                return (getc());
        return -1;
 }
 
+static ulong ymodem_read_fit(struct spl_load_info *load, ulong offset,
+                            ulong size, void *addr)
+{
+       int res, err;
+       struct ymodem_fit_info *info = load->priv;
+       char *buf = info->buf;
+
+       while (info->image_read < offset) {
+               res = xyzModem_stream_read(buf, BUF_SIZE, &err);
+               if (res <= 0)
+                       return res;
+               info->image_read += res;
+       }
+
+       if (info->image_read > offset) {
+               res = info->image_read - offset;
+               memcpy(addr, &buf[BUF_SIZE - res], res);
+               addr = addr + res;
+       }
+
+       while (info->image_read < offset + size) {
+               res = xyzModem_stream_read(buf, BUF_SIZE, &err);
+               if (res <= 0)
+                       return res;
+
+               memcpy(addr, buf, res);
+               info->image_read += res;
+               addr += res;
+       }
+
+       return size;
+}
+
 int spl_ymodem_load_image(void)
 {
        int size = 0;
@@ -31,30 +76,55 @@ int spl_ymodem_load_image(void)
        int ret;
        connection_info_t info;
        char buf[BUF_SIZE];
-       ulong store_addr = ~0;
        ulong addr = 0;
 
        info.mode = xyzModem_ymodem;
        ret = xyzModem_stream_open(&info, &err);
+       if (ret) {
+               printf("spl: ymodem err - %s\n", xyzModem_error(err));
+               return ret;
+       }
+
+       res = xyzModem_stream_read(buf, BUF_SIZE, &err);
+       if (res <= 0)
+               goto end_stream;
+
+       if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
+           image_get_magic((struct image_header *)buf) == FDT_MAGIC) {
+               struct spl_load_info load;
+               struct ymodem_fit_info info;
+
+               debug("Found FIT\n");
+               load.dev = NULL;
+               load.priv = (void *)&info;
+               load.filename = NULL;
+               load.bl_len = 1;
+               info.buf = buf;
+               info.image_read = BUF_SIZE;
+               load.read = ymodem_read_fit;
+               ret =  spl_load_simple_fit(&load, 0, (void *)buf);
+               size = info.image_read;
 
-       if (!ret) {
-               while ((res =
-                       xyzModem_stream_read(buf, BUF_SIZE, &err)) > 0) {
-                       if (addr == 0) {
-                               ret = spl_parse_image_header((struct image_header *)buf);
-                               if (ret)
-                                       return ret;
-                       }
-                       store_addr = addr + spl_image.load_addr;
+               while ((res = xyzModem_stream_read(buf, BUF_SIZE, &err)) > 0)
+                       size += res;
+       } else {
+               spl_parse_image_header((struct image_header *)buf);
+               ret = spl_parse_image_header((struct image_header *)buf);
+               if (ret)
+                       return ret;
+               addr = spl_image.load_addr;
+               memcpy((void *)addr, buf, res);
+               size += res;
+               addr += res;
+
+               while ((res = xyzModem_stream_read(buf, BUF_SIZE, &err)) > 0) {
+                       memcpy((void *)addr, buf, res);
                        size += res;
                        addr += res;
-                       memcpy((char *)(store_addr), buf, res);
                }
-       } else {
-               printf("spl: ymodem err - %s\n", xyzModem_error(err));
-               return ret;
        }
 
+end_stream:
        xyzModem_stream_close(&err);
        xyzModem_stream_terminate(false, &getcymodem);