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fat_fs: Add support for the "win" variable alignment in FATFS struct

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This is to support Sypnosys Designware SDMMC controller read and write
operation where the buffer address is needed to be 16bytes and 512bytes
aligned. Adding macro FS_FATFS_WINDOW_ALIGNMENT to align the "win"
variable address in FATFS struct.

Signed-off-by: Boon Khai Ng <boon.khai.ng@intel.com>
This commit is contained in:
Boon Khai Ng 2021-12-13 09:39:31 +08:00 committed by Anas Nashif
parent 67f6b439b2
commit e46d8a1d51
1 changed files with 13 additions and 0 deletions
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subsys/fs/Kconfig.fatfs
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@ -129,6 +129,19 @@ config FS_FATFS_MAX_SS
range 512 4096
default 512
config FS_FATFS_WINDOW_ALIGNMENT
int "Memory alignment for the member \"win\" in FATFS"
default 1
help
Specifies alignment, in bytes of FAT FS window buffer that is
used for device's read/write operations. MMC controllers may
require read/write buffer to start at memory address with
specific alignment, for example 16 or 512 bytes, the value
provided here is used as such alignment. Note that the window
buffer is internal element of FATFS structure, which means
that, in worst scenario, value provided here may cause FATFS
structure to have size of twice the value
endmenu
endif # FAT_FILESYSTEM_ELM