[U-Boot] [PATCH v2] fat: Define MAX_CLUSTSIZE only if not defined in config

[Michal Simek]

On 05/26/2014 12:29 PM, Siva Durga Prasad Paladugu wrote:
> Define the MAX_CLUSTSIZE to default of 65536 only if
> CONFIG_FS_FAT_MAX_CLUSTSIZE is not defined in board
> specific config file.
> Also please define your own MAX_CLUSTSIZE value if
> CONFIG_FS_FAT_MAX_CLUSTSIZE is defined.
> This option has been provided to save memory in some
> memory constrained cases.
> 
> Signed-off-by: Siva Durga Prasad Paladugu <sivadur at xilinx.com>
> ---
> 
> Changes in v2:
> -Defined CONFIG_FS_FAT_MAX_CLUSTSIZE and documented as
> per review comment.
> 
>  README        |    7 +++++++
>  include/fat.h |    2 ++
>  2 files changed, 9 insertions(+), 0 deletions(-)
> 
> diff --git a/README b/README
> index 5f89552..0d947cb 100644
> --- a/README
> +++ b/README
> @@ -1613,6 +1613,13 @@ CBFS (Coreboot Filesystem) support
>  		filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls
>  		and cbfsload.
>  
> +- FAT(File Allocation Table) filesystem write/read buffer size:
> +		CONFIG_FS_FAT_MAX_CLUSTSIZE
> +
> +		If this macro is not defined then the default MAX_CLUSTSIZE
> +		is defined with 65536 else specify your own MAX_CLUSTSSIZE
> +		value.
> +
>  - Keyboard Support:
>  		CONFIG_ISA_KEYBOARD
>  
> diff --git a/include/fat.h b/include/fat.h
> index 81d9790..8b67851 100644
> --- a/include/fat.h
> +++ b/include/fat.h
> @@ -18,7 +18,9 @@
>  #define VFAT_MAXSEQ		9   /* Up to 9 of 13 2-byte UTF-16 entries */
>  #define PREFETCH_BLOCKS		2
>  
> +#ifndef CONFIG_FS_FAT_MAX_CLUSTSIZE
>  #define MAX_CLUSTSIZE	65536
> +#endif
>  #define DIRENTSPERBLOCK	(mydata->sect_size / sizeof(dir_entry))
>  #define DIRENTSPERCLUST	((mydata->clust_size * mydata->sect_size) / \
>  			 sizeof(dir_entry))
> 

CONFIG_FS_FAT_MAX_CLUSTSIZE is not used anywhere.

This should be the solution.

#ifndef CONFIG_FS_FAT_MAX_CLUSTSIZE
#define CONFIG_FS_FAT_MAX_CLUSTSIZE	65536
#endif

#define MAX_CLUSTSIZE	CONFIG_FS_FAT_MAX_CLUSTSIZE

Please send v3.

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform


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