├── LICENSE ├── Makefile ├── README.md └── mtdRW.c /LICENSE: -------------------------------------------------------------------------------- 1 | CC0 1.0 Universal 2 | 3 | Statement of Purpose 4 | 5 | The laws of most jurisdictions throughout the world automatically confer 6 | exclusive Copyright and Related Rights (defined below) upon the creator and 7 | subsequent owner(s) (each and all, an "owner") of an original work of 8 | authorship and/or a database (each, a "Work"). 9 | 10 | Certain owners wish to permanently relinquish those rights to a Work for the 11 | purpose of contributing to a commons of creative, cultural and scientific 12 | works ("Commons") that the public can reliably and without fear of later 13 | claims of infringement build upon, modify, incorporate in other works, reuse 14 | and redistribute as freely as possible in any form whatsoever and for any 15 | purposes, including without limitation commercial purposes. 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Affirmer understands and acknowledges that Creative Commons is not a 112 | party to this document and has no duty or obligation with respect to this 113 | CC0 or use of the Work. 114 | 115 | For more information, please see 116 | 117 | 118 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | 2 | KERNEL_DIR := /opt/work/repos/bitbucket-dev-lwn/linux-display5-fitImage 3 | MODULE_NAME := mtdRW 4 | PWD := $(shell pwd) 5 | CROSS=/opt/target_sdk/tmp/sysroots/x86_64/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi- 6 | 7 | obj-m := $(MODULE_NAME).o 8 | 9 | all: 10 | make -C $(KERNEL_DIR) M=$(PWD) modules 11 | 12 | clean: 13 | make -C $(KERNEL_DIR) M=$(PWD) clean 14 | 15 | 16 | # Alternatives for cross compiling 17 | all-cross: 18 | @echo 'Building Kernel Driver for module $(MODULE_NAME).' 19 | make ARCH=arm CROSS_COMPILE=$(CROSS) -C $(KERNEL_DIR) SUBDIRS=$(PWD) M=$(PWD) modules 20 | 21 | clean-cross: 22 | make -C $(KERNEL_DIR) SUBDIRS=$(PWD) ARCH=arm CROSS_COMPILE=$(CROSS) clean 23 | 24 | install: $(MODULE_NAME).ko 25 | cp $(MODULE_NAME).ko $(MODULE_DIR)/kernel/drivers/mtd 26 | depmod 27 | 28 | uninstall: 29 | rm -f $(MODULE_DIR)/kernel/drivers/mtd/$(MODULE_NAME).ko 30 | depmod 31 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # mtdRW 2 | 3 | A small Linux kernel module that makes all MTD partitions writeable. 4 | 5 | Build and Load: 6 | ``` 7 | make 8 | insmod mtdRW.ko 9 | ``` 10 | 11 | dmesg output 12 | ``` 13 | [86522.151371] mtdRW: Start to unlock MTD partitions! 14 | [86522.151403] mtdRW: Make mtd device writeable: SPL (spi) 15 | [86522.151417] mtdRW: Make mtd device writeable: u-boot (spi) 16 | [86522.151426] mtdRW: Make mtd device writeable: uboot-env (spi) 17 | [86522.151433] mtdRW: Make mtd device writeable: uboot-envr (spi) 18 | [86522.151450] mtdRW: Make mtd device writeable: swupdate-fitImg (spi) 19 | [86522.151471] mtdRW: Make mtd device writeable: swupdate-initramfs (spi) 20 | [86522.151492] mtdRW: Make mtd device writeable: reserved (spi) 21 | [86522.151503] mtdRW: Make mtd device writeable: factory (spi) 22 | ``` 23 | 24 | Sources: 25 | 26 | * http://electronics.stackexchange.com/questions/67955/arm-linux-and-uboot-can-i-make-a-read-only-mtd-writable 27 | -------------------------------------------------------------------------------- /mtdRW.c: -------------------------------------------------------------------------------- 1 | /** 2 | * @file mtdRW.c 3 | * @author Moritz Warning 4 | * @date 11 January 2017 5 | * @version 1.0 6 | * @brief A Linux Module to make mtd devices writeable until the syste reboots. 7 | * This is useful when a partition needs to be written, but is initially read only. 8 | */ 9 | 10 | #include 11 | #include 12 | #include 13 | #include 14 | #include 15 | 16 | MODULE_LICENSE("GPL"); 17 | MODULE_AUTHOR("Moritz Warning"); 18 | MODULE_DESCRIPTION("A simple Linux driver to make mtd devices writeable."); 19 | MODULE_VERSION("1.0"); 20 | 21 | static int __init mtdRW_init(void) { 22 | struct mtd_info *mtd; 23 | bool keep_going; 24 | int n; 25 | 26 | printk(KERN_INFO "mtdRW: Start to unlock MTD partitions!\n"); 27 | 28 | keep_going = true; 29 | for (n = 0; keep_going; n++) { 30 | mtd = get_mtd_device(NULL, n); 31 | if (!IS_ERR(mtd)) { 32 | mtd->flags |= MTD_WRITEABLE; 33 | printk(KERN_INFO "mtdRW: Make mtd device writeable: %s\n", mtd->name); 34 | put_mtd_device(mtd); 35 | } else { 36 | keep_going = false; 37 | } 38 | } 39 | 40 | return 0; 41 | } 42 | 43 | static void __exit mtdRW_exit(void) { 44 | // Nothing to do 45 | } 46 | 47 | module_init(mtdRW_init); 48 | module_exit(mtdRW_exit); 49 | --------------------------------------------------------------------------------