fat: Define MAX_CLUSTSIZE using CONFIG_FS_FAT_MAX_CLUSTSIZE
Define the MAX_CLUSTSIZE to default of 65536 only if
CONFIG_FS_FAT_MAX_CLUSTSIZE is not defined.
This option has been provided to save memory in some
memory constrained cases.
Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Acked-by: Michal Simek <monstr@monstr.eu>
diff --git a/README b/README
index 6edb2e7..256d6ec 100644
--- a/README
+++ b/README
@@ -1637,6 +1637,12 @@
filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls
and cbfsload.
+- FAT(File Allocation Table) filesystem cluster size:
+ CONFIG_FS_FAT_MAX_CLUSTSIZE
+
+ Define the max cluster size for fat operations else
+ a default value of 65536 will be defined.
+
- Keyboard Support:
CONFIG_ISA_KEYBOARD
diff --git a/include/fat.h b/include/fat.h
index 81d9790..63cf787 100644
--- a/include/fat.h
+++ b/include/fat.h
@@ -18,7 +18,11 @@
#define VFAT_MAXSEQ 9 /* Up to 9 of 13 2-byte UTF-16 entries */
#define PREFETCH_BLOCKS 2
-#define MAX_CLUSTSIZE 65536
+#ifndef CONFIG_FS_FAT_MAX_CLUSTSIZE
+#define CONFIG_FS_FAT_MAX_CLUSTSIZE 65536
+#endif
+#define MAX_CLUSTSIZE CONFIG_FS_FAT_MAX_CLUSTSIZE
+
#define DIRENTSPERBLOCK (mydata->sect_size / sizeof(dir_entry))
#define DIRENTSPERCLUST ((mydata->clust_size * mydata->sect_size) / \
sizeof(dir_entry))