Commit 656f4c65 authored by Donggeun Kim's avatar Donggeun Kim Committed by Anatolij Gustschin

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 default avatarDonggeun Kim <>
Signed-off-by: default avatarKyungmin Park <>
Signed-off-by: default avatarMaximilian Schwerin <>
Signed-off-by: default avatarAnatolij Gustschin <>
parent bf6b6af7
......@@ -1233,8 +1233,12 @@ The following options need to be configured:
- FAT(File Allocation Table) filesystem write function support:
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:
......@@ -184,3 +184,60 @@ U_BOOT_CMD(
"<interface> <dev[:part]>\n"
" - print information about filesystem from 'dev' on 'interface'"
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;
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'"
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