1# SPDX-License-Identifier: GPL-2.0-only 2menuconfig MTD_SPI_NOR 3 tristate "SPI NOR device support" 4 depends on MTD 5 depends on MTD && SPI_MASTER 6 select SPI_MEM 7 help 8 This is the framework for the SPI NOR which can be used by the SPI 9 device drivers and the SPI NOR device driver. 10 11if MTD_SPI_NOR 12 13config MTD_SPI_NOR_USE_4K_SECTORS 14 bool "Use small 4096 B erase sectors" 15 default y 16 help 17 Many flash memories support erasing small (4096 B) sectors. Depending 18 on the usage this feature may provide performance gain in comparison 19 to erasing whole blocks (32/64 KiB). 20 Changing a small part of the flash's contents is usually faster with 21 small sectors. On the other hand erasing should be faster when using 22 64 KiB block instead of 16 × 4 KiB sectors. 23 24 Please note that some tools/drivers/filesystems may not work with 25 4096 B erase size (e.g. UBIFS requires 15 KiB as a minimum). 26 27choice 28 prompt "Software write protection at boot" 29 default MTD_SPI_NOR_SWP_DISABLE_ON_VOLATILE 30 31config MTD_SPI_NOR_SWP_DISABLE 32 bool "Disable SWP on any flashes (legacy behavior)" 33 help 34 This option disables the software write protection on any SPI 35 flashes at boot-up. 36 37 Depending on the flash chip this either clears the block protection 38 bits or does a "Global Unprotect" command. 39 40 Don't use this if you intent to use the software write protection 41 of your SPI flash. This is only to keep backwards compatibility. 42 43config MTD_SPI_NOR_SWP_DISABLE_ON_VOLATILE 44 bool "Disable SWP on flashes w/ volatile protection bits" 45 help 46 Some SPI flashes have volatile block protection bits, ie. after a 47 power-up or a reset the flash is software write protected by 48 default. 49 50 This option disables the software write protection for these kind 51 of flashes while keeping it enabled for any other SPI flashes 52 which have non-volatile write protection bits. 53 54 If the software write protection will be disabled depending on 55 the flash either the block protection bits are cleared or a 56 "Global Unprotect" command is issued. 57 58 If you are unsure, select this option. 59 60config MTD_SPI_NOR_SWP_KEEP 61 bool "Keep software write protection as is" 62 help 63 If you select this option the software write protection of any 64 SPI flashes will not be changed. If your flash is software write 65 protected or will be automatically software write protected after 66 power-up you have to manually unlock it before you are able to 67 write to it. 68 69endchoice 70 71source "drivers/mtd/spi-nor/controllers/Kconfig" 72 73endif # MTD_SPI_NOR 74