cmd_fat: add FAT write command

Once CONFIG_FAT_WRITE is defined, users can invoke 'fatwrite' command
that saves data in RAM as a FAT file.

This patch was originally part of

http://article.gmane.org/gmane.comp.boot-loaders.u-boot/121847

Signed-off-by: Donggeun Kim <dg77.kim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Maximilian Schwerin <mvs@tigris.de>
Signed-off-by: Anatolij Gustschin <agust@denx.de>

diff --git a/README b/README
index b69a3b6f6edc96c58491249d0f6665d07ea31987..110eac6f16131a7cc54c14db9f47f5acd9a63292 100644 (file)
--- a/README
+++ b/README
@@ -1233,8 +1233,12 @@ The following options need to be configured:
 
 - FAT(File Allocation Table) filesystem write function support:
                CONFIG_FAT_WRITE
-               Support for saving memory data as a file
-               in FAT formatted partition
+
+               Define this to enable support for saving memory data as a
+               file in FAT formatted partition.
+
+               This will also enable the command "fatwrite" enabling the
+               user to write files to FAT.
 
 - Keyboard Support:
                CONFIG_ISA_KEYBOARD

diff --git a/common/cmd_fat.c b/common/cmd_fat.c
index 022049434343dc04cf6acea10ab8c1e821cc875e..559a16d6195c6ca8f432dd700949ef34d2086814 100644 (file)
--- a/common/cmd_fat.c
+++ b/common/cmd_fat.c
@@ -184,3 +184,60 @@ U_BOOT_CMD(
        "<interface> <dev[:part]>\n"
        "    - print information about filesystem from 'dev' on 'interface'"
 );
+
+#ifdef CONFIG_FAT_WRITE
+static int do_fat_fswrite(cmd_tbl_t *cmdtp, int flag,
+               int argc, char * const argv[])
+{
+       long size;
+       unsigned long addr;
+       unsigned long count;
+       block_dev_desc_t *dev_desc = NULL;
+       int dev = 0;
+       int part = 1;
+       char *ep;
+
+       if (argc < 5)
+               return cmd_usage(cmdtp);
+
+       dev = (int)simple_strtoul(argv[2], &ep, 16);
+       dev_desc = get_dev(argv[1], dev);
+       if (dev_desc == NULL) {
+               puts("\n** Invalid boot device **\n");
+               return 1;
+       }
+       if (*ep) {
+               if (*ep != ':') {
+                       puts("\n** Invalid boot device, use `dev[:part]' **\n");
+                       return 1;
+               }
+               part = (int)simple_strtoul(++ep, NULL, 16);
+       }
+       if (fat_register_device(dev_desc, part) != 0) {
+               printf("\n** Unable to use %s %d:%d for fatwrite **\n",
+                       argv[1], dev, part);
+               return 1;
+       }
+       addr = simple_strtoul(argv[3], NULL, 16);
+       count = simple_strtoul(argv[5], NULL, 16);
+
+       size = file_fat_write(argv[4], (void *)addr, count);
+       if (size == -1) {
+               printf("\n** Unable to write \"%s\" from %s %d:%d **\n",
+                       argv[4], argv[1], dev, part);
+               return 1;
+       }
+
+       printf("%ld bytes written\n", size);
+
+       return 0;
+}
+
+U_BOOT_CMD(
+       fatwrite,       6,      0,      do_fat_fswrite,
+       "write file into a dos filesystem",
+       "<interface> <dev[:part]> <addr> <filename> <bytes>\n"
+       "    - write file 'filename' from the address 'addr' in RAM\n"
+       "      to 'dev' on 'interface'"
+);
+#endif