mtd-rw's Introduction

mtd-rw - Write-enabler for MTD partitions

Sets the MTD_WRITEABLE flag on all MTD partitions that are marked readonly. When unloading, read-only partitions will be restored. This module is intended for embedded devices where the mtd partition layout may be hard-coded in the firmware. If, for some reason, you DO have to write to a read-only partition (which is often a bad idea), this module is the way to go.

The module is currently limited to the first 64 partitions, but this should suffice for most purposes.

Inspired by [email protected]: https://electronics.stackexchange.com/a/116133/97342

Usage:

# insmod mtd-rw.ko i_want_a_brick=1
# dmesg | grep mtd-rw
[52997.620000] mtd-rw: mtd0: setting writeable flag
[52997.630000] mtd-rw: mtd1: setting writeable flag
[52997.640000] mtd-rw: mtd3: setting writeable flag
[52997.650000] mtd-rw: mtd4: setting writeable flag
[52997.660000] mtd-rw: mtd6: setting writeable flag

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mtd-rw's Issues

Compile error (for 15.05)

make[3]: Entering directory `build_dir/target-mips_34kc_uClibc-0.9.33.2/linux-ar71xx_generic/linux-3.18.23'
  CC [M]  build_dir/target-mips_34kc_uClibc-0.9.33.2/linux-ar71xx_generic/mtd-rw-git-20160210/mtd-rw.o
build_dir/target-mips_34kc_uClibc-0.9.33.2/linux-ar71xx_generic/mtd-rw-git-20160210/mtd-rw.c: In function 'mtd_rw_init':
build_dir/target-mips_34kc_uClibc-0.9.33.2/linux-ar71xx_generic/mtd-rw-git-20160210/mtd-rw.c:91:2: error: 'count' undeclared (first use in this function)
  count = 0;
  ^

Quick fix:

--- a/mtd-rw.c
+++ b/mtd-rw.c
@@ -81,7 +81,7 @@

 static int __init mtd_rw_init(void)
 {
-   int i, err;
+   int i, err, count;

    if (!i_want_a_brick) {
        printk(MOD_ERR "must specify i_want_a_brick=1 to continue\n");

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