Hi. > Ours is a embedded product with pre-defined flash partitions say "Boot" > , "Kernel" , "Rootfs" & "ProductData". > The kernel which is in the box (linux 2.6.14)has Boot partition as "RO" > (Read Only). We have a requirement in the field that the boot code > should be upgraded also. > Is there any possibility of changing the partition permissions at > run-time? If so how ? > Our solution was to create a Kernel image Boot as RW, upgrade the kernel > & reboot. Later change the Boot code. It is. For the MeshCube, for each mtd partition we have added a proc entry called /proc/sys/mtd/<mtdnum>/rw, with a value of 0 meanung read only and a value of 1 meaning read-write. We used it to be able to disable the write protection of the bootloader partition before an update of the bootloader. I have attached the patch as an indication, of how it could be done. This patch will not work with a 2.6 kernel anymore. It has been for the 2.4.27 kernel, that has been used for the MeshCube. It must be adopted to the 2.6 kernel and the /proc/sys stuff could be done in a better way than we did it using the sysctl support. You may take a look at some drivers like drivers/parport/procfs.c how it is done for the parallel port. The function register_sysctl_table is the key to it. Regards, Michael
