diff options
author | Marek Vasut <marex@denx.de> | 2015-08-02 23:28:56 (GMT) |
---|---|---|
committer | Jagan Teki <jteki@openedev.com> | 2015-08-17 10:29:48 (GMT) |
commit | 0a02655481834a4ebdf457e43c24729ffd7daf37 (patch) | |
tree | 0202005fa3dfe497b6884c3c59ff59675fe7787b /drivers/mtd/spi/Kconfig | |
parent | 632093b566569329bc6e5b0893bdca01de905314 (diff) | |
download | u-boot-0a02655481834a4ebdf457e43c24729ffd7daf37.tar.xz |
sf: Make 4K sector support configurable
Make the support for 4K subpage I/O on a SPI NOR flash configurable.
A board which requires the SPI NOR to be accessed in larger 32KiB
or 64KiB pages can disable the 4K subpage support, but by default,
the support for 4K subpage I/O is enabled. The functionality of this
option is the same as CONFIG_MTD_SPI_NOR_USE_4K_SECTORS in Linux.
This is extremely useful in case one uses UBI on a SPI NOR flash.
UBI needs at least 15k EBs and can not work on a flash which uses
4k ones, so disabling the support for 4k subpages lets UBI work on
such flash.
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Jagan Teki <jteki@openedev.com>
Diffstat (limited to 'drivers/mtd/spi/Kconfig')
-rw-r--r-- | drivers/mtd/spi/Kconfig | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/mtd/spi/Kconfig b/drivers/mtd/spi/Kconfig index 8b730ff..3f7433c 100644 --- a/drivers/mtd/spi/Kconfig +++ b/drivers/mtd/spi/Kconfig @@ -86,6 +86,21 @@ config SPI_FLASH_WINBOND endif +config SPI_FLASH_USE_4K_SECTORS + bool "Use small 4096 B erase sectors" + depends on SPI_FLASH + default y + help + Many flash memories support erasing small (4096 B) sectors. Depending + on the usage this feature may provide performance gain in comparison + to erasing whole blocks (32/64 KiB). + Changing a small part of the flash's contents is usually faster with + small sectors. On the other hand erasing should be faster when using + 64 KiB block instead of 16 × 4 KiB sectors. + + Please note that some tools/drivers/filesystems may not work with + 4096 B erase size (e.g. UBIFS requires 15 KiB as a minimum). + config SPI_FLASH_DATAFLASH bool "AT45xxx DataFlash support" depends on SPI_FLASH && DM_SPI_FLASH |