1# SPDX-License-Identifier: GPL-2.0-only 2menuconfig MTD_SPI_NOR 3 tristate "SPI NOR device support" 4 depends on MTD && SPI_MASTER 5 select SPI_MEM 6 help 7 This is the framework for the SPI NOR which can be used by the SPI 8 device drivers and the SPI NOR device driver. 9 10if MTD_SPI_NOR 11 12config MTD_SPI_NOR_USE_4K_SECTORS 13 bool "Use small 4096 B erase sectors" 14 default y 15 help 16 Many flash memories support erasing small (4096 B) sectors. Depending 17 on the usage this feature may provide performance gain in comparison 18 to erasing whole blocks (32/64 KiB). 19 Changing a small part of the flash's contents is usually faster with 20 small sectors. On the other hand erasing should be faster when using 21 64 KiB block instead of 16 × 4 KiB sectors. 22 23 Please note that some tools/drivers/filesystems may not work with 24 4096 B erase size (e.g. UBIFS requires 15 KiB as a minimum). 25 26choice 27 prompt "Software write protection at boot" 28 default MTD_SPI_NOR_SWP_DISABLE_ON_VOLATILE 29 30config MTD_SPI_NOR_SWP_DISABLE 31 bool "Disable SWP on any flashes (legacy behavior)" 32 help 33 This option disables the software write protection on any SPI 34 flashes at boot-up. 35 36 Depending on the flash chip this either clears the block protection 37 bits or does a "Global Unprotect" command. 38 39 Don't use this if you intent to use the software write protection 40 of your SPI flash. This is only to keep backwards compatibility. 41 42config MTD_SPI_NOR_SWP_DISABLE_ON_VOLATILE 43 bool "Disable SWP on flashes w/ volatile protection bits" 44 help 45 Some SPI flashes have volatile block protection bits, ie. after a 46 power-up or a reset the flash is software write protected by 47 default. 48 49 This option disables the software write protection for these kind 50 of flashes while keeping it enabled for any other SPI flashes 51 which have non-volatile write protection bits. 52 53 If the software write protection will be disabled depending on 54 the flash either the block protection bits are cleared or a 55 "Global Unprotect" command is issued. 56 57 If you are unsure, select this option. 58 59config MTD_SPI_NOR_SWP_KEEP 60 bool "Keep software write protection as is" 61 help 62 If you select this option the software write protection of any 63 SPI flashes will not be changed. If your flash is software write 64 protected or will be automatically software write protected after 65 power-up you have to manually unlock it before you are able to 66 write to it. 67 68endchoice 69 70source "drivers/mtd/spi-nor/controllers/Kconfig" 71 72endif # MTD_SPI_NOR 73