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FAT: Add FAT write feature

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In some cases, saving data in RAM as a file with FAT format is required.
This patch allows the file to be written in FAT formatted partition.

The usage is similar with reading a file.
First, fat_register_device function is called before file_fat_write function
in order to set target partition.
Then, file_fat_write function is invoked with desired file name,
start ram address for writing data, and file size.

Signed-off-by: Donggeun Kim <dg77.kim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
This commit is contained in:
Donggeun Kim 2011-10-24 21:15:28 +00:00 committed by Wolfgang Denk
parent eea63e05d0
commit c30a15e590
5 changed files with 1101 additions and 0 deletions
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5
README
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@ -1175,6 +1175,11 @@ The following options need to be configured:
to disable the command chpart. This is the default when you
have not defined a custom partition
- FAT(File Allocation Table) filesystem write function support:
CONFIG_FAT_WRITE
Support for saving memory data as a file
in FAT formatted partition
- Keyboard Support:
CONFIG_ISA_KEYBOARD

1
fs/fat/Makefile
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@ -25,6 +25,7 @@ LIB = $(obj)libfat.o
AOBJS =
COBJS-$(CONFIG_CMD_FAT) := fat.o
COBJS-$(CONFIG_FAT_WRITE):= fat_write.o
ifndef CONFIG_SPL_BUILD
COBJS-$(CONFIG_CMD_FAT) += file.o

2
fs/fat/fat.c
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@ -46,6 +46,7 @@ static void downcase (char *str)
static block_dev_desc_t *cur_dev = NULL;
static unsigned long part_offset = 0;
static unsigned long part_size;
static int cur_part = 1;
@ -99,6 +100,7 @@ int fat_register_device (block_dev_desc_t * dev_desc, int part_no)
if (!get_partition_info(dev_desc, part_no, &info)) {
part_offset = info.start;
cur_part = part_no;
part_size = info.size;
} else if ((strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET], "FAT", 3) == 0) ||
(strncmp((char *)&buffer[DOS_FS32_TYPE_OFFSET], "FAT32", 5) == 0)) {
/* ok, we assume we are on a PBR only */

1090
fs/fat/fat_write.c Normal file
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File diff suppressed because it is too large Load Diff

3
include/fat.h
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@ -99,6 +99,8 @@
#endif
#define TOLOWER(c) if((c) >= 'A' && (c) <= 'Z'){(c)+=('a' - 'A');}
#define TOUPPER(c) if ((c) >= 'a' && (c) <= 'z') \
(c) -= ('a' - 'A');
#define START(dent) (FAT2CPU16((dent)->start) \
+ (mydata->fatsize != 32 ? 0 : \
(FAT2CPU16((dent)->starthi) << 16)))
@ -210,4 +212,5 @@ long file_fat_read(const char *filename, void *buffer, unsigned long maxsize);
const char *file_getfsname(int idx);
int fat_register_device(block_dev_desc_t *dev_desc, int part_no);
int file_fat_write(const char *filename, void *buffer, unsigned long maxsize);
#endif /* _FAT_H_ */