0001 # SPDX-License-Identifier: GPL-2.0-only
0002 menuconfig MTD_SPI_NOR
0003 tristate "SPI NOR device support"
0004 depends on MTD
0005 depends on MTD && SPI_MASTER
0006 select SPI_MEM
0007 help
0008 This is the framework for the SPI NOR which can be used by the SPI
0009 device drivers and the SPI NOR device driver.
0010
0011 if MTD_SPI_NOR
0012
0013 config MTD_SPI_NOR_USE_4K_SECTORS
0014 bool "Use small 4096 B erase sectors"
0015 default y
0016 help
0017 Many flash memories support erasing small (4096 B) sectors. Depending
0018 on the usage this feature may provide performance gain in comparison
0019 to erasing whole blocks (32/64 KiB).
0020 Changing a small part of the flash's contents is usually faster with
0021 small sectors. On the other hand erasing should be faster when using
0022 64 KiB block instead of 16 × 4 KiB sectors.
0023
0024 Please note that some tools/drivers/filesystems may not work with
0025 4096 B erase size (e.g. UBIFS requires 15 KiB as a minimum).
0026
0027 choice
0028 prompt "Software write protection at boot"
0029 default MTD_SPI_NOR_SWP_DISABLE_ON_VOLATILE
0030
0031 config MTD_SPI_NOR_SWP_DISABLE
0032 bool "Disable SWP on any flashes (legacy behavior)"
0033 help
0034 This option disables the software write protection on any SPI
0035 flashes at boot-up.
0036
0037 Depending on the flash chip this either clears the block protection
0038 bits or does a "Global Unprotect" command.
0039
0040 Don't use this if you intent to use the software write protection
0041 of your SPI flash. This is only to keep backwards compatibility.
0042
0043 config MTD_SPI_NOR_SWP_DISABLE_ON_VOLATILE
0044 bool "Disable SWP on flashes w/ volatile protection bits"
0045 help
0046 Some SPI flashes have volatile block protection bits, ie. after a
0047 power-up or a reset the flash is software write protected by
0048 default.
0049
0050 This option disables the software write protection for these kind
0051 of flashes while keeping it enabled for any other SPI flashes
0052 which have non-volatile write protection bits.
0053
0054 If the software write protection will be disabled depending on
0055 the flash either the block protection bits are cleared or a
0056 "Global Unprotect" command is issued.
0057
0058 If you are unsure, select this option.
0059
0060 config MTD_SPI_NOR_SWP_KEEP
0061 bool "Keep software write protection as is"
0062 help
0063 If you select this option the software write protection of any
0064 SPI flashes will not be changed. If your flash is software write
0065 protected or will be automatically software write protected after
0066 power-up you have to manually unlock it before you are able to
0067 write to it.
0068
0069 endchoice
0070
0071 source "drivers/mtd/spi-nor/controllers/Kconfig"
0072
0073 endif # MTD_SPI_NOR
